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1. Force sensor utilizing stiffness change of shape-memory polymer based on temperature

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan, Kagawa Prefectural Industrial Technology Research Center, 587-1 Gotocho, Takamatsu, 716-8031, Japan, Department of Information Engineering, Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tenpaku-ku, Nagoya, 468-8502, Japan, Takashima, Kazuto, Kamizono, Hiroki, Takenaka, Makoto, Mukai, Toshiharu, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan, Kagawa Prefectural Industrial Technology Research Center, 587-1 Gotocho, Takamatsu, 716-8031, Japan, Department of Information Engineering, Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tenpaku-ku, Nagoya, 468-8502, Japan, Takashima, Kazuto, Kamizono, Hiroki, Takenaka, Makoto, and Mukai, Toshiharu

Abstract

type:Journal Article, In this study, we propose a force sensor using a shape-memory polymer (SMP) whose stiffness varies according to the temperature. An SMP can be deformed above its glass transition temperature (T g) by applying a small load. A deformed SMP maintains its shape when cooled below T g and returns to its predefined shape when subsequently heated above T g. The reversible change in the elastic modulus between the glassy and rubbery states of an SMP can be on the order of several hundred-fold. The relationship between the applied force and the deformation of the SMP changes depending on the temperature. Our sensor consists of strain gauges bonded to an SMP bending beam and senses the applied force by measuring the strain. Therefore, the force measuring range and the sensitivity can be changed according to the temperature. In this study, we evaluate a prototype of the sensor using the SMP sheet with embedded electrical heating wire. Moreover, we improve the sensor by combining the SMP and a stainless steel plate. The enhanced versatility of SMP force sensors is demonstrated through a series of experiments conducted using the prototype.

Published
2020

2. First-principles study of electronic and optical properties of lead-free double perovskites Cs2NaBX6 (B = Sb, Bi; X = Cl, Br, I)

Author

School of Science, Chongqing University of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Zhao, Shuai, Yamamoto, Kumiko, Iikubo, Satoshi, Hayase, Shuzi, Ma, Tingli, School of Science, Chongqing University of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Zhao, Shuai, Yamamoto, Kumiko, Iikubo, Satoshi, Hayase, Shuzi, and Ma, Tingli

Abstract

type:Journal Article, Organolead halide perovskite is regarded as the most promising light-harvesting material for next-generation solar cells; however, the intrinsic instability and toxicity of lead are still of great concern. Bismuth is ecofriendly and has electronic properties similar to those of lead, which has gradually attracted interest for optoelectronic applications. However, the valence state of bismuth is different from that of lead, eliminating the possibility of replacing lead by bismuth in organolead halide perovskites. To address this matter, one feasible strategy is to construct B-site double perovskites by the combination of Bi3+ and B+ in 1:1 ratio. In this work, lead-free halide double perovskites of the form Cs2NaBX6 (B = Sb, Bi; X = Cl, Br, I) were investigated by first-principles calculations. The electronic properties, optical absorption coefficients, and thermodynamic stability of these compounds were investigated to ascertain their potential application in solar energy conversion. The results provide theoretical support for the exploration of lead-free perovskite materials in potential optoelectronic applications.

Published
2020

3. In situ photoacoustic FTIR studies on photocatalytic oxidation of 2-propanol over titanium(IV) oxide

Author

Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Research Center for Eco-fitting Technology, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, Koga, Nobunori, Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Research Center for Eco-fitting Technology, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, and Koga, Nobunori

Abstract

type:Journal Article, Adsorption and photocatalytic reaction of 2-propanol over titanium(IV) oxide (TiO2) were studied by Fourier transform infrared spectroscopy (FTIR) using a photoacoustic (PA) technique. At first, the validity of the FTIR system using a home-made PA cell was confirmed by comparison with conventional transmission FTIR. The spectrum of TiO2 with 2-propanol showed different propoxy peaks from those of gaseous 2-propanol as a result of chemisorption on TiO2. Finally, in situ FTIR observation of the photocatalytic oxidation of 2-propanol was carried out. Under ultraviolet irradiation, PA spectra changed due to complete oxidation of 2-propanol through acetone as an intermediate., source:https://doi.org/10.1016/j.catcom.2016.04.017

Published
2020

4. Minute quantities of hexagonal nanoplates PtFe alloy with facile operating conditions enhanced electrocatalytic activity and durability for oxygen reduction reaction

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Wang, Nannan, Li, Yanqiang, Guo, Zhanglin, Li, Huan, Hayase, Shuzi, Ma, Tingli, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Wang, Nannan, Li, Yanqiang, Guo, Zhanglin, Li, Huan, Hayase, Shuzi, and Ma, Tingli

Abstract

type:Journal Article, Pt-based alloys have been explored as the most promising cathode catalyst for fuel cells due to their excellent electrocatalytic activity in oxygen reduction reaction (ORR). However, the long-term performance of Pt-based alloys is compromised owing to the de-alloying behavior under the corrosive circumstance. More importantly, the complicated synthesized methods have hindered their further practical application. In this report, a facile and effective operating conditions-assisted method has been developed to synthesize the stable hexagonal nanoplates PtFe alloy with a high electrocatalytic activity. In the three prepared PtM (M: Fe, Co, Ni) alloy samples, the PtFe alloy exhibits a superior catalytic activity, which improves by about 100 and 178?mV for half-wave potential in alkaline and acidic medium with the same Pt-loading amount, respectively. In addition, the PtFe alloy catalyst exhibits an electrochemical stability, compared to the conventional carbon-supported Pt catalysts. In view of the advantages of the facile operating preparation and the excellent electrocatalytic performance, we believe that the hexagonal nanoplates PtFe alloy holds great application as a promising electrocatalyst in polymer electrolyte membrane fuel cell (PEMFC)., source:https://doi.org/10.1016/j.jallcom.2018.04.181

Published
2020

5. Robotic cloth manipulation for clothing assistance task using Dynamic Movement Primitives

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan, Graduate School of Information Science, Nara Institute of Science and Technology, Nara, Japan and Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan, Joshi, Ravi P., Koganti, Nishanth, Shibata, Tomohiro, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan, Graduate School of Information Science, Nara Institute of Science and Technology, Nara, Japan and Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan, Joshi, Ravi P., Koganti, Nishanth, and Shibata, Tomohiro

Abstract

type:Conference Paper, The need of robotic clothing assistance in the field of assistive robotics is growing, as it is one of the most basic and essential assistance activities in daily life of elderly and disabled people. In this study we are investigating the applicability of using Dynamic Movement Primitives (DMP) as a task parameterization model for performing clothing assistance task. Robotic cloth manipulation task deals with putting a clothing article on both the arms. Robot trajectory varies significantly for various postures and also there can be various failure scenarios while doing cooperative manipulation with non-rigid and highly deformable clothing article. We have performed experiments on soft mannequin instead of human. Result shows that DMPs are able to generalize movement trajectory for modified posture., 3rd International Conference of Robotics Society of India (AIR '17: Advances in Robotics), June 28 - July 2, 2017, New Delhi, India

Published
2020

6. Photoacoustic Fourier Transform Near- and Mid-Infrared Spectroscopy for Measurement of Energy Levels of Electron Trapping Sites in Titanium(IV) Oxide Photocatalyst Powders

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan, Shinoda, Tatsuki, Murakami, Naoya, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan, Shinoda, Tatsuki, and Murakami, Naoya

Abstract

type:Journal Article, Electron trapping sites in titanium(IV) oxide photocatalyst powders were investigated by photoacoustic (PA) Fourier transform near-infrared spectroscopy (FT-NIR) and mid-infrared spectroscopy (FT-MIR). PA measurements using FT-NIR and FT-MIR enabled in situ observation of the energy levels of electron trapping sites in wide energy levels (0.1–1.9 eV) below the bottom of the conduction band. During ultraviolet (UV) irradiation, PA intensity increased depending on the wavenumber, and changes in the PA spectra were observed as a result of the trivalent titanium species generated by accumulation of electrons at trapping sites. Moreover, the PA spectral shape during UV irradiation was essentially different between the crystal structures, and it greatly depended on the crystal structure rather than other properties such as specific surface area and particle size. The results for various samples suggest that anatase has shallower energy levels of electron trapping sites than those of rutile and brookite, with the main energy level of the trapping sites being deep in the order of brookite > rutile > anatase. Thus, the PA technique using FT-NIR and FT-MIR is an effective method for measurements of energy levels of electron trapping sites in semiconductor photocatalysts., source:https://doi.org/10.1021/acs.jpcc.9b02876

Published
2020

7. In situ photoacoustic spectroscopic analysis on photocatalytic decolorization of methylene blue over titanium(IV) oxide particles

Author

Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Research Center for Eco-fitting Technology, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, Maruno, Hirotaka, Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Research Center for Eco-fitting Technology, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, and Maruno, Hirotaka

Abstract

type:Journal Article, Photoabsorption of an aqueous suspension containing methylene blue (MB) dye and titanium(IV) oxide (TiO2) powder was evaluated using photoacoustic spectroscopy (PAS). Simultaneous detection of photoabsorption of MB both in solution and adsorbed on TiO2 was performed using a corrosion-resistant cell with microphone detection. In addition, time-course PAS measurements were employed to observe the photocatalytic decolorization of MB in the aqueous suspension. The time-course data of the MB decolorization process attributed to the oxidation or reduction of MB was obtained at 20 s intervals. Moreover, the MB decolorization rate as a function of the initial pH of the suspension was different from that obtained by conventional evaluation methods. This discrepancy most likely stems from the advantages of PAS analysis, which enables the detection of all MB dye included in the aqueous suspension., source:https://doi.org/10.1039/C6RA12135G

Published
2020

8. Addition Effect of Pyreneammonium Iodide to Methylammonium Lead Halide Perovskite‐2D/3D Heterostructured Perovskite with Enhanced Stability

Author

Graduate School of Life Science and Systems Engineering Institution Kyushu Institute of Technology, 2‐4 Hibikino Wakamatsu‐ku, Kitakyushu, 808‐0196 Japan, Graduate School of Life Science and Systems Engineering Institution Kyushu Institute of Technology, 2‐4 Hibikino Wakamatsu‐ku, Kitakyushu, 808‐0196, Japan, Yang, Fu, Zhang, Putao, Kamarudin, Muhammad Akmal, Kapil, Gaurav, Ma, Tingli, Hayase, Shuzi, Graduate School of Life Science and Systems Engineering Institution Kyushu Institute of Technology, 2‐4 Hibikino Wakamatsu‐ku, Kitakyushu, 808‐0196 Japan, Graduate School of Life Science and Systems Engineering Institution Kyushu Institute of Technology, 2‐4 Hibikino Wakamatsu‐ku, Kitakyushu, 808‐0196, Japan, Yang, Fu, Zhang, Putao, Kamarudin, Muhammad Akmal, Kapil, Gaurav, Ma, Tingli, and Hayase, Shuzi

Abstract

type:Journal Article, Despite the eminent performance of the organometallic halide perovskite solar cells (PSCs), the poor stability for humidity and ultraviolet irradiation is still major problem for the commercialization of PSCs. Herein, a novel functional organic compound 1‐(ammonium acetyl)pyrene is successfully introduced for preparing the 2D/3D heterostructured MAPbI3 perovskite. Because of the functional organic pyrene group with high humidity resistance and strong absorption in the ultraviolet region, the 2D/3D perovskite film shows notable stability with no degradation in ≈60% relative humidity after even six months and exhibits a high ultraviolet irradiation stability which keeps nearly no degradation after 1 h in the UV Ozone treatment. Planar PSCs are fabricated in the ≈60% relative humidity air outside glovebox. The champion efficiency of (PEY2PbI4)0.02MAPbI3 perovskite solar cells is 14.7% with nearly no hysteresis which is equal performance of 3D MAPbI3 devices (15.0%). This work presents a new direction for enhancing the solar cells' performance and stability by incorporating a functional organic aromatic compound into the perovskite layer.

Published
2019

9. Layer-by-layer coating of oriented conjugated polymer films towards anisotropic electronics

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Pandey, Manish, Sadakata, Shifumi, Nagamatsu, Shuichi, Pandey, Shyam S., Hayase, Shuzi, Takashima, Wataru, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Pandey, Manish, Sadakata, Shifumi, Nagamatsu, Shuichi, Pandey, Shyam S., Hayase, Shuzi, and Takashima, Wataru

Abstract

type:Journal Article, Dynamic casting of floating-film and transferring method for preparing oriented multilayer films of conjugated polymers is reported. This method is based on dynamic casting of a floating-film on liquid substrate to obtain oriented thin-film followed by its transfer on a desired solid substrate. The uniqueness in this method lies in the isolation of casting and coating procedures of oriented films, which enables us to fabricate the oriented multilayer with minimum interlayer interference. It provides a key-technology to build up the organic multi-layered architecture while preserving oriented morphologies. Several types of multilayer films have been prepared and investigated in detail in terms of their film characteristics. The layer-by-layer coating of oriented films demonstrated by this method is found to be a unique feature which overcomes cumbersome procedures in the conventional orientation methods. The coating procedure demonstrated in this study provides a facile methodology to construct anisotropic architectures.

Published
2019

10. Effects of (R)-3-Hydroxyhexanoate Units on Thermal Hydrolysis of Poly((R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate)s

Author

Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0196, Japan, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0196, Japan, Rajaratanam, Dhurga Devi, Ariffin, Hidayah, Hassan, Mohd Ali, Kawasaki, Yuki, Nishida, Haruo, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0196, Japan, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0196, Japan, Rajaratanam, Dhurga Devi, Ariffin, Hidayah, Hassan, Mohd Ali, Kawasaki, Yuki, and Nishida, Haruo

Abstract

type:Journal Article, In order to clarify effects of (R)-3-hydroxyhexanoate (HHx) unit on the hydrothermal degradation of poly((R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate) (PHBHHx), two PHBHHxs: P(HB-co-6%-HHx) and P(HB-co-11%-HHx), and poly((R)-3-hydroxybutyrate) (PHB) as a reference were treated by superheated steam at 130-190°C. Interestingly, despite having contents of the HHx unit nearby, contrastive degradation property: the contradictory scission behavior of HB-HHx sequence was confirmed. From analysis of chain-end structures, it was confirmed that HHx unit basically suppressed the hydrolysis of HB-HHx sequence and the formation of crotonoyl chain-end groups rapidly increased at higher temperatures, suggesting the shift to thermal degradation from hydrolysis as a main reaction. On thermal degradation, the contrary upper and lower Ea values: 138 ± 1.9 and 121 ± 1.8kJ·mol-1 for P(HB-co-6%-HHx) and P(HB-co-11%-HHx), respectively, compared to Ea value: 126 ± 5.3kJ·mol-1 of PHB were obtained. The HHx unit basically acts as suppressing factor of the thermal degradation from Td50 and Td50-Tm values; however, the increase in flexibility of polymer sequence must promote the thermal chain cleavage. Thus, the complex hydrothermal degradation behaviors were considered to be combined results of the suppression effects by hydrophobicity and steric hindrance of propyl group in HHx unit and the promotive effects of lower crystallinity and easier steam diffusion into more flexible amorphous region of PHBHHx., source:http://dx.doi.org/10.1016/j.polymdegradstab.2017.01.007

Published
2019

11. Metal-organic framework derived hierarchical porous TiO2 nanopills as a super stable anode for Na-ion batteries

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Li, Huan, Zhang, Zhiguo, Huang, Xiao, Lan, Tongbin, Wei, Mingdeng, Ma, Tingli, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Li, Huan, Zhang, Zhiguo, Huang, Xiao, Lan, Tongbin, Wei, Mingdeng, and Ma, Tingli

Abstract

type:Journal Article, Hierarchical porous TiO2 nanopills were synthesized using a titanium metal-organic framework MIL-125(Ti) as precursor. The as-synthesized TiO2 nanopills owned a large specific surface area of 102 m2/g and unique porous structure. Furthermore, the obtained TiO2 nanopills were applied as anode materials for Na-ion batteries for the first time. The as-synthesized TiO2 nanopills achieved a high discharge capacity of 196.4 mAh/g at a current density of 0.1 A/g. A discharge capacity of 115.9 mAh/g was obtained at a high current density of 0.5 A/g and the capacity retention was remained as high as 90% even after 3000 cycles. The excellent electrochemical performance can be attributed to its unique hierarchical porous feature., source:https://doi.org/10.1016/j.jechem.2017.02.008

Published
2019

12. Influence of backbone structure on orientation of conjugated polymers in the dynamic casting of thin floating-films

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Pandey, Manish, Pandey, Shyam S., Nagamatsu, Shuichi, Hayase, Shuzi, Takashima, Wataru, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Pandey, Manish, Pandey, Shyam S., Nagamatsu, Shuichi, Hayase, Shuzi, and Takashima, Wataru

Abstract

type:Journal Article, Dynamic casting of conjugated polymer films on liquid-substrate is a unique method which provides thin floating-film and can be easily transferred on a desired substrate by stamping. The important feature in this procedure is associated with the formation of thin polymeric film during compression and solidification controlled by viscous drag of liquid substrate and solvent evaporation of the polymer, respectively. Lyotropic liquid-crystalline (LC) characteristics of conjugated polymer possibly assist to orient the polymer chain in one direction. It is found that this method produce highly oriented thin films (dichroic ratio > 5) of thiophene-based conjugated polymers such as PBTTT-C14, PQT-C12 and non-regiocontrolled poly(3-hexylthiophene) NR-P3HT. On the other hand, weak orientation intensity in regioregular poly(3-hexylthiophene) RR-P3HT was found. The mechanism for this diverse orientation in thiophene-based conjugated polymers is discussed in correlation with the backbone chemical structure and lyotropic LC phase transition during the floating-film formation.

Published
2019

13. Effect of lead-free (CH3NH3)3Bi2I9 perovskite addition on spectrum absorption and enhanced photovoltaic performance of bismuth triiodide solar cells

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, College of Physics and Energy, Shenzhen Key Laboratory of Sensor Technology, Shenzhen University, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Lan, Chunfeng, Luo, Jingting, Zhao, Shuai, Zhang, Chu, Liu, Weiguo, Hayase, Shuzi, Ma, Tingli, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, College of Physics and Energy, Shenzhen Key Laboratory of Sensor Technology, Shenzhen University, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, School of Petroleum and Chemical Engineering, Dalian University of Technology, Lan, Chunfeng, Luo, Jingting, Zhao, Shuai, Zhang, Chu, Liu, Weiguo, Hayase, Shuzi, and Ma, Tingli

Abstract

type:Journal Article, Active composite layers of bismuth triiodide (BiI3) and lead-free (CH3NH3)3Bi2I9 (MBI) perovskite were prepared using a simple chemical solution method under ambient conditions for thin-film solar cells. Results of X-ray diffraction and scanning electron microscopy indicated that the crystallization and surface morphologies of the composite films varied with perovskite contents. Multi-absorption was observed in the composite films due to the bandgap difference between BiI3 and MBI perovskite. Moreover, band bending at the BiI3-perovskite interfaces resulted in the realignment of energy levels in the composite films, and this phenomenon was beneficial to the efficient injection of excited electrons from the active layers into the TiO2 layers. Accordingly, due to the optimized crystallization and realigned energy level, when 20% of MBI perovskite was introduced into the active layers, the open-circuit voltage obviously increased from 0.44 V to 0.57 V in the (BiI3)0.8(MBI)0.2 composites solar cells, enhancing their power conversion efficiency by 67% compared with that in pure BiI3 solar cell. This study developed a new route for designing more efficient lead-free solar cells., source:https://doi.org/10.1016/j.jallcom.2017.01.169

Published
2019

14. Orientation Characteristics of Non-regiocontrolled Poly (3-hexyl-thiophene) Film by FTM on Various Liquid Substrates

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Pandey, M, Nagamatsu, S, Pandey, S S, Hayase, S, Takashima, W, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Pandey, M, Nagamatsu, S, Pandey, S S, Hayase, S, and Takashima, W

Abstract

type:Journal Article, Orientation characteristics of non-regiocontrolled poly (3-hexylthiophene) (NR-P3HT) films prepared by dynamic casting of floating film and transferring method (FTM) has been investigated. The film was first cast on liquid-substrate to obtain as a floating-film followed by its transfer on solid-substrate such as white-glass or Si-wafer in order to evaluate their optoelectronic characteristics. As a possible key-factor to generate the orientation of conjugated polymer in this method we focused on the components of liquid-substrate in this study. The orientation dependence upon various liquid-substrates reveals that dichroic ratio strongly changes with liquid-substrates. Pictures of floating-film show the change in size of floating-parts depending upon the liquid-substrate, representing the expansion length of casting solution upon the viscosity. These findings have indicated that spreading speed of polymer solution and solvent evaporation speed controls the size of floating-film leading to change in the orientation intensity. The multilayer coatings of oriented NR-P3HT films were used for polarized FTIR analysis exhibiting clear dichroism. The obtained dichroic characteristics were well corresponded with in-plane, out-of-plane and non-oriented vibronic modes of P3HT., India-Japan Expert Group Meeting on Biomolecular Electronics & Organic Nanotechnology for Environment Preservation (IJEGMBE 2015), December 23-26, 2015, Fukuoka, Japan, source:https://doi.org/10.1088/1742-6596/704/1/012005

Published
2018

15. Casting Control of Floating-films into Ribbon-shape Structure by modified Dynamic FTM

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Tripathi, A, Pandey, M, Nagamatsu, S, Pandey, S S, Hayase, S, Takashima, W, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Department of Computer Science and Electronics, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Reseach Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Tripathi, A, Pandey, M, Nagamatsu, S, Pandey, S S, Hayase, S, and Takashima, W

Abstract

type:Journal Article, We have developed a new method to obtain Ribbon-shaped floating films via dynamic casting of floating-film and transfer method (dynamic-FTM). Dynamic-FTM is a unique method to prepare oriented thin-film of conjugated polymers (CPs) which is quick and easy. This method has several advantages as compared to the other conventional casting procedure to prepare oriented CP films. In the conventional dynamic FTM appearance of large scale circular orientation poses difficulty not only for practical applications but also hinders the detailed analysis of the orientation mechanism. In this present work, pros and cons of this newly proposed ribbon-shaped floating-film have been discussed in detail from those of the conventional floating-film prepared by dynamic-FTM., 12th International Conference on Nanomolecular Electronics (ICNME-2016), December 14-16, 2016, Kobe International Conference Center, Kobe, Japan, source:https://doi.org/10.1088/1742-6596/924/1/012014

Published
2018

16. Tunable Open Circuit Voltage by Engineering Inorganic Cesium Lead Bromide/Iodide Perovskite Solar Cells

Author

Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Functional Device Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, Institute of Advanced Materials (INAM), Department of Chemistry, Faculty of Science, King Abdulaziz Universit, Ng, Chi Huey, Ripolles, Teresa S., Hamada, Kengo, Teo, Siow Hwa, Lim, Hong Ngee, Bisquert, Juan, Hayase, Shuzi, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Functional Device Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, Institute of Advanced Materials (INAM), Department of Chemistry, Faculty of Science, King Abdulaziz Universit, Ng, Chi Huey, Ripolles, Teresa S., Hamada, Kengo, Teo, Siow Hwa, Lim, Hong Ngee, Bisquert, Juan, and Hayase, Shuzi

Abstract

type:Journal Article, Perovskite solar cells based on series of inorganic cesium lead bromide and iodide mixture, CsPbBr3-xI x , where x varies between 0, 0.1, 0.2, and 0.3 molar ratio were synthesized by two step-sequential deposition at ambient condition to design the variations of wide band gap light absorbers. A device with high overall photoconversion efficiency of 3.98 % was obtained when small amount of iodide (CsPbBr2.9I0.1) was used as the perovskite and spiro-OMeTAD as the hole transport material (HTM). We investigated the origin of variation in open circuit voltage, Voc which was shown to be mainly dependent on two factors, which are the band gap of the perovskite and the work function of the HTM. An increment in Voc was observed for the device with larger perovskite band gap, while keeping the electron and hole extraction contacts the same. Besides, the usage of bilayer P3HT/MoO3 with deeper HOMO level as HTM instead of spiro-OMeTAD, thus increased the Voc from 1.16 V to 1.3 V for CsPbBr3 solar cell, although the photocurrent is lowered due to charge extraction issues. The stability studies confirmed that the addition of small amount of iodide into the CsPbBr3 is necessarily to stabilize the cell performance over time.

Published
2018

17. Physicochemical Changes in Windrow Co-Composting Process of Oil Palm Mesocarp Fiber and Palm Oil Mill Effluent Anaerobic Sludge

Author

Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Hock, Lim Siong, Baharuddin, Azhari Samsu, Ahmad, Mohd Najib, Shah, Umi Kalsom Md, Rahman, Nor' Aini Abdul, Hassan, Suraini Abd-Aziz, Shirai, Yoshihito, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Hock, Lim Siong, Baharuddin, Azhari Samsu, Ahmad, Mohd Najib, Shah, Umi Kalsom Md, Rahman, Nor' Aini Abdul, Hassan, Suraini Abd-Aziz, and Shirai, Yoshihito

Abstract

type:Journal Article, The effect of hydraulic retention time and volatile fatty acids produced during fermentation were investigated on biohydrogen production from palm oil mill effluent in a 50 L bioreactor. The fermentation was done in three different hydraulic retention times; HRT 5, HRT 3 and HRT 2 days. Hydraulic retention time and volatile fatty acids concentration showed a vital role in response to the biohydrogen concentration, biohydrogen rate and biohydrogen yield. The maximum biohydrogen concentration was obtained at HRT 2 days with 30% hydrogen content in biogas. The biohydrogen yield and rate were 1054 NmL/L-POME and 44 NmL/h/L-POME, respectively. The lowest biohydrogen yield and rate were observed at HRT 5 days with 557 NmL/L-POME and 5 NmL/h/LPOME, respectively. Meanwhile, the accumulation of propionic acid concentration up to 7 g/L was suggested as a factor that reduced the biohydrogen production., source:http://www.ajbasweb.com

Published
2018

18. A Useful Biomass Component for Simple Fabrication of the Honeycomb Poly(L-lactide) Film

Author

Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Andou, Yoshito, Pattanawihok, Suphachai, Jauzein, Vincent, Wakisaka, Minato, Shirai, Yoshihito, Nishida, Haruo, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Andou, Yoshito, Pattanawihok, Suphachai, Jauzein, Vincent, Wakisaka, Minato, Shirai, Yoshihito, and Nishida, Haruo

Abstract

type:Journal Article, This concept is the development of useful material based on biomass such as a poly(L--lactide)[PLLA] with new added-value to extend applications. PLLA, which is an attractive raw material produced from renewable resources, has received much attention for applications in bioabsorbable and biodegradable materials. However, PLLA is not utilized well for practical use. This paper has explored an additive compound, which is a biocompatible, to facilitate a regular patterned porous film from PLLA to provide a valuable material. The method we adopted was to form a regular pattern on polymer film containing a surfactant in order to help the amphiphilic polymer to migrate at the interface between the organic solvent and the water droplets as the water-assisted formation method. To give the regular patterned porous film, some compounds from biomass were used for the water-assisted formation method. As surfactants in PLLA solutions, the experimental results showed the effectiveness of soy-bean oil. The pore size and surface morphology on the film can be controlled through the moisture condition, the PLLA concentration, and the molecular weight of PLLA., source:http://journal.hibiscuspublisher.com/index.php/NAB/article/view/42

Published
2018

19. The prevalence of foodborne pathogenic bacteria on cutting boards and their ecological correlation with background biota

Author

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Medical Microbiology and Parasitology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, Department of Medical Microbiology and Parasitology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Laboratory of Soil Microbiology, Faculty of Agriculture, Graduate School, Kyushu University, Laboratory of Molecular Gene Technique, Faculty of Agriculture, Graduate School, Kyushu, University, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Abdul-Mutalib, Noor-Azira, Nordin, Syafinaz Amin, Osman, Malina, Roslan, Ahmad Muhaimin, Ishida, Natsumi, Sakai, Kenji, Tashiro, Yukihiro, Tashiro, Kosuke, Maeda, Toshinari, Shirai, Yoshihito, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Medical Microbiology and Parasitology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, Department of Medical Microbiology and Parasitology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Laboratory of Soil Microbiology, Faculty of Agriculture, Graduate School, Kyushu University, Laboratory of Molecular Gene Technique, Faculty of Agriculture, Graduate School, Kyushu, University, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Abdul-Mutalib, Noor-Azira, Nordin, Syafinaz Amin, Osman, Malina, Roslan, Ahmad Muhaimin, Ishida, Natsumi, Sakai, Kenji, Tashiro, Yukihiro, Tashiro, Kosuke, Maeda, Toshinari, and Shirai, Yoshihito

Abstract

type:Journal Article, This study implemented the pyrosequencing technique and real-time quantitative PCR to determine the prevalence of foodborne pathogenic bacteria (FPB) and as well as the ecological correlations of background biota and FPB present on restaurant cutting boards (CBs) collected in Seri Kembangan, Malaysia. The prevalence of FPB in high background biota (HBB) was lower (0.24%) compared to that of low background biota (LBB) (0.54%). In addition, a multiple linear regression analysis indicated that only HBB had a significant ecological correlation with FPB. Furthermore, statistical analysis revealed that the combinations of Clostridiales, Flavobacteriales, and Lactobacillales orders in HBB had significant negative associations with FPB, suggesting that these bacteria may interact to ensure survivability and impair the growth of pathogenic bacteria.

Published
2018

20. Effects of Palm Oil Mill Effluent (POME) Anaerobic Sludge From 500m3 of Closed Anaerobic Methane Digested Tank on Pressed-Shredded Empty Fruit Bunch (EFB) Composting Process

Author

Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia,Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Department of Plant Resources, Graduate School of Bioresources and Bioenvironmental Sciences, Kyushu University, Baharuddin, Azhari Samsu, Hock, Lim Siong, Md Yusof, Mohd Zulkhairi, Rahman, Nor' Aini Abdul, Shah, Umi kalsom Md, Hassan, Mohd Ali, Wakisaka, Minato, Sakai, Kenji, Shirai, Yoshihito, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia,Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Department of Plant Resources, Graduate School of Bioresources and Bioenvironmental Sciences, Kyushu University, Baharuddin, Azhari Samsu, Hock, Lim Siong, Md Yusof, Mohd Zulkhairi, Rahman, Nor' Aini Abdul, Shah, Umi kalsom Md, Hassan, Mohd Ali, Wakisaka, Minato, Sakai, Kenji, and Shirai, Yoshihito

Abstract

type:Journal Article, In this study, co-composting of pressed-shredded empty fruit bunches (EFB) and palm oil mill effluent (POME) anaerobic sludge from 500 m3 closed anaerobic methane digested tank was carried out. High nitrogen and nutrients content were observed in the POME anaerobic sludge. The sludge was subjected to the pressed-shredded EFB to accelerate the co-composting treatment. In the present study, changes in the physicochemical characteristics of co-composting process were recorded and evaluated. The co-composting treatment was completed in a short time within 40 days with a final C/N ratio of 12.4. The co-composting process exhibited a higher temperature (60 - 67℃) in the thermophilic phase followed by curing phase after four weeks of treatment. Meanwhile, pH of the composting pile (8.1 - 8.6) was almost constant during the process and moisture content was reduced from 64.5% (initial treatment) to 52.0% (final matured compost). The use of pressed-shredded EFB as a main carbon source and bulking agent contributed to the optimum oxygen level in the composting piles (10 - 15%). The biodegradation of composting materials is shown by the reduction of cellulose (34.0%) and hemicellulose (27.0%) content towards the end of treatment. In addition, considerable amount of nutrients and low level of heavy metals were detected in the final matured compost. It can be concluded that the addition of POME anaerobic sludge into the pressed-shredded EFB composting process could produce acceptable and consistent quality of compost product in a short time., source:http://www.academicjournals.org/journal/AJB

Published
2018

21. Recombination Suppression in PbS Quantum Dot Heterojunction Solar Cells by Energy-Level Alignment in the Quantum Dot Active Layers

Author

Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan, China Scholarship Council, Level 13, Building A3, No.9 Chegongzhuang Avenue, Beijing 100044, China, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan, CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan, Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture, No.15 Yongyuan Road, Huangcun, Daxing, Beijing 102616, China, Ding, Chao, Zhang, Yaohong, Liu, Feng, Nakazawa, Naoki, Huang, Qingxun, Hayase, Shuzi, Ogomi, Yuhei, Toyoda, Taro, Wang, Ruixiang, Shen, Qing, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan, China Scholarship Council, Level 13, Building A3, No.9 Chegongzhuang Avenue, Beijing 100044, China, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan, CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan, Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture, No.15 Yongyuan Road, Huangcun, Daxing, Beijing 102616, China, Ding, Chao, Zhang, Yaohong, Liu, Feng, Nakazawa, Naoki, Huang, Qingxun, Hayase, Shuzi, Ogomi, Yuhei, Toyoda, Taro, Wang, Ruixiang, and Shen, Qing

Abstract

type:Journal Article, Using spatial energy-level gradient engineering with quantum dots (QDs) of different sizes to increase the generated carrier collection at the junction of a QD heterojunction solar cell (QDHSC) is a hopeful route for improving the energy-conversion efficiency. However, the results of current related research have shown that a variable band-gap structure in a QDHSC will create an appreciable increase, not in the illumination current density, but rather in the fill factor. In addition, there are a lack of studies on the mechanism of the effect of these graded structures on the photovoltaic performance of QDHSCs. This study presents the development of air atmosphere solution-processed TiO2/PbS QDs/Au QDHSCs by engineering the energy-level alignment (ELA) of the active layer via the use of a sorted order of differently sized QD layers (four QD sizes). In comparison to the ungraded device (without the ELA), the optimized graded architecture (containing the ELA) solar cells exhibited a great increase (21.4%) in short-circuit current density (Jsc). As a result, a Jsc value greater than 30 mA/cm2 has been realized in planar, thinner absorption layer (∼300 nm) PbS QDHSCs, and the open-circuit voltage (Voc) and power-conversion efficiency (PCE) were also improved. Through characterization by the light intensity dependences of the Jsc and Voc and transient photovoltage decay, we find that (i) the ELA structure, serving as an electron-blocking layer, reduces the interfacial recombination at the PbS/anode interface, and (ii) the ELA structure can drive more carriers toward the desirable collection electrode, and the additional carriers can fill the trap states, reducing the trap-assisted recombination in the PbS QDHSCs. This work has clearly elucidated the mechanism of the recombination suppression in the graded QDHSCs and demonstrated the effects of ELA structure on the improvement of Jsc. The charge recombination mechanisms characterized in this work would be able to shed ligh, source:DOI: 10.1021/acsami.7b06552

Published
2018

22. Thermal Degradation Behavior of Poly (lactic acid) Stereocomplex

Author

Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Shirai, Yoshihito, Tokiwa, Yutaka, Endo, Takeshi, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Shirai, Yoshihito, Tokiwa, Yutaka, and Endo, Takeshi

Abstract

type:Journal Article, Thermal degradation of poly(lactic acid) stereocomplex (scPLA) was investigated to clarify the pyrolysis mechanism. Three scPLA samples with different chain end structures were prepared, namely, as-polymerized scPLA-ap, precipitated-with-methanol scPLA-pr, and purified metal-free scPLA-H. From the analyses of thermal degradation kinetics and pyrolyzates of the scPLA samples, typical degradation mechanisms of these scPLAs were proposed as follows: The pyrolysis of scPLA-ap proceeds through main unzipping depolymerization caused by Sn-alkoxide chain ends with apparent Ea = 80-100kJ mol-1, showing zero-order weight loss behavior. The pyrolysis of scPLA-pr also proceeds via a zero-order weight loss process consisting of main Sn-catalyzed selective lactide elimination with apparent Ea = 100-120kJ mol-1 caused by Sn-carboxylate chain ends. The pyrolyzates from scPLA-ap and scPLA–pr were predominantly L,L-/D,D-lactides. In the case of scPLA-H, random degradation is a main process, producing a large amount of meso-lactide and cyclic oligomers. These degradation mechanisms were nearly the same as those of the corresponding PLLAs, except that the scPLA-ap pyrolysis started at higher temperature due to the higher melting point of scPLA.

Published
2018

23. Feedstock Recycling of Flame-Resisting Poly(lactic acid)/Aluminum Hydroxide Composite to L,L-lactide

Author

Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 820-8502, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, Yamagata 992-8510, Japan, Nishida, Haruo, Fan, Yujiang, Mori, Tomokazu, Oyagi, Naoko, Shirai, Yoshihito, Endo, Takeshi, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 820-8502, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, Yamagata 992-8510, Japan, Nishida, Haruo, Fan, Yujiang, Mori, Tomokazu, Oyagi, Naoko, Shirai, Yoshihito, and Endo, Takeshi

Abstract

type:Journal Article, To achieve the chemical recycling of flame-resisting materials consisting of poly(L-lactic acid) (PLLA), a safer flame-resisting material, PLLA/aluminum hydroxide {Al(OH)3} composite, was investigated the capability of the feedstock recyclability to optically active monomer L,L-lactide. The thermal stabilization of the composite was improved compared to those of as-polymerized PLLA and Al(OH)3 themselves, which makes the melt processing of the composite easier. Nevertheless, at temperatures lower than 300°C the effective depolymerization of PLLA proceeded, without any racemization reaction, to selectively convert into L,L-lactide, with Al(OH)3 acting as a catalyst for the depolymerization. This means that the PLLA/Al(OH)3 composite is capable of reconciling flame resistance with feedstock recycling of PLLA to cyclic monomer., source:http://dx.doi.org/10.1021/ie049208+

Published
2018

24. Production of biochar with high mineral content from oil palm biomass

Author

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology ,Faculty of Chemical Engineering, Universiti Teknologi MARA (UiTM) Sarawak, Faculty of Chemical Engineering, Universiti Teknologi MARA (UiTM) Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Bioprocess Technology, Faculty of Biotechnology and Bimolecular Sciences, Department of Bioprocess Technology, Faculty of Biotechnology and Bimolecular Sciences, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Idris, Juferi, Shirai, Yoshihito, Ando, Yoshito, Ali, Ahmad Amiruddin Mohd, Othman, Mohd Ridzuan, Ibrahim, Izzudin, Hassan, Mohd Ali, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology ,Faculty of Chemical Engineering, Universiti Teknologi MARA (UiTM) Sarawak, Faculty of Chemical Engineering, Universiti Teknologi MARA (UiTM) Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Bioprocess Technology, Faculty of Biotechnology and Bimolecular Sciences, Department of Bioprocess Technology, Faculty of Biotechnology and Bimolecular Sciences, Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Idris, Juferi, Shirai, Yoshihito, Ando, Yoshito, Ali, Ahmad Amiruddin Mohd, Othman, Mohd Ridzuan, Ibrahim, Izzudin, and Hassan, Mohd Ali

Abstract

type:Journal Article, Carbonization of oil palm empty fruit bunch (OPEFB) biomass for the production of high mineral content biochar under an uncontrolled carbonization temperature and controlled air flow rate was studied using a pilot-scale brick carbonization reactor. The maximum temperature during the carbonization process was found to be in the range of 543 to 564 oC at exhaust gas flow rate of 36 m3/hr. All minerals (i.e P, K ,Mg, Ca, Na, Mn, Fe, Cr, AI) showed an increased from the feedstock concentration up to 300 %. The concentration of heavy metal extracted from OPEFB biochar was lower than listed ceiling permitted levels. This proposed system without electrical control and heating source is preferable to the industry due to its simplicity, ease of operation and low energy requirement making it suitable for OPEFB biochar production for mulching purposes with more than double the mineral content compared to raw OPEFB biomass., source:http://www.ukm.my/mjas/mjas2018

Published
2018

25. Characteristic Chain-End Racemization Behavior during Photolysis of Poly(L-lactic acid)

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Yasuda, Nobuhiko, Tsukegi, Takayuki, Shirai, Yoshihito, Nishida, Haruo, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering and Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Yasuda, Nobuhiko, Tsukegi, Takayuki, Shirai, Yoshihito, and Nishida, Haruo

Abstract

type:Journal Article, Photolysis of poly(L-lactic acid) (PLLA) has many unclear points, such as the degradation mechanism, kinetics, products, and racemization mechanism. To clarify these features of PLLA photolysis, we examined the relationship between photolysis and racemization. The hexad stereosequential analysis of photodegraded PLLA was investigated to specify the racemized positions within a chain in comparison with hydrolysis and thermal degradation. Results from 13C NMR spectra of UV-irradiated PLLA samples indicated that the samples have racemized D-lactate units at chain ends. From the comparison of racemization behavior among photolysis, hydrolysis, and thermal degradation, it was confirmed that the preferential racemization behavior of each of these three degradation processes is characteristic and distinct, being identified as chain-end racemization, poor racemization, or internal-unit racemization, respectively. The characteristic chain-end racemization behavior of photolysis was first confirmed in this study., source:http://dx.doi.org/10.1021/bm200775r

Published
2018

26. Preparation of chitosan-hydroxyapatite composite mono-fiber using coagulation method and their mechanical properties

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Natural Science and Technology, Okayama University, CEMUC, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia, Universidade do Porto, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology/ Frontier Research Academy for Young Researchers, Kyushu Institute of Technology, Okada, Takuma, Nobunaga, Yuta, Konishi, Toshiisa, Yoshioka, Tomohiko, Hayakawa, Satoshi, Lopes, Maria Ascensão, Miyazaki, Toshiki, Shirosaki, Yuki, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Graduate School of Natural Science and Technology, Okayama University, CEMUC, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia, Universidade do Porto, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology/ Frontier Research Academy for Young Researchers, Kyushu Institute of Technology, Okada, Takuma, Nobunaga, Yuta, Konishi, Toshiisa, Yoshioka, Tomohiko, Hayakawa, Satoshi, Lopes, Maria Ascensão, Miyazaki, Toshiki, and Shirosaki, Yuki

Abstract

type:Journal Article, Autograft has been carried out for anterior cruciate ligament (ACL) reconstruction surgery. However, it has negative aspect because patients lose their healthy ligaments from other part. We focus on a chitosan-hydroxyapatite (HAp) composite fiber as a scaffold of ligament regeneration. Chitosan- HAp composite fiber was made by using coagulation method. Chitosan-NaH2PO4 solution was coagulated with coagulation bath including calcium ion to get the mono-fiber and then treated with sodium hydroxide solution to form HAp in fiber matrix. The mechanical property of the fiber was improved by the stretching of the wet one because of the orientation of chitosan molecule and the interaction between chitosan and HAp. Maximum stress was improved with increasing of sodium dihydrogen phosphate until 0.03 M. The swelling ratio of the fiber was inhibited by composited with HAp. Additionally, bone-bonding ability was confirmed by SBF soaking tests., source:https://doi.org/10.1016/j.carbpol.2017.07.072

Published
2018

27. Functional PCS power supply system with EV battery storage for stable PV power delivery

Author

Department of Biological Functions and Engineering Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan, Department of Electrical and Electronic Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Department of Biological Functions and Engineering Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan, Department of Electrical and Electronic Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Fuji, Kiyotaka, Shirai, Yoshihito, Kawagoe, Takahisa, Shiota, Atsushi, Mitani, Yasunori, Qudaih, Yaser Soliman, Department of Biological Functions and Engineering Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan, Department of Electrical and Electronic Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Department of Biological Functions and Engineering Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan, Department of Electrical and Electronic Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Fuji, Kiyotaka, Shirai, Yoshihito, Kawagoe, Takahisa, Shiota, Atsushi, Mitani, Yasunori, and Qudaih, Yaser Soliman

Abstract

type:Journal Article, This research proposes a residential Photovoltaic-Power Conditioning Subsystem (PV-PCS) in a functional and stable power supply system with battery storage (Electric Vehicle [EV] storage etc.) to reduce PV output fluctuation. In PV power generation, PV power fluctuations caused by weather changes make it difficult to obtain stable power output. Further, it can then be expected that this adversely affects the power system. In this paper, functional power supply system model is constructed with power fluctuation suppression control system using bidirectional DC/DC converter and existing residential PCS and EV battery storage. Furthermore, simulation results of the electric battery power suppression element of the PV power fluctuation are also shown by using Simple Moving Average (SMA) control method to suppress PV power fluctuation. PV power suppression system using existing residential PCS has an advantage that can not only suppress the energy change during normal operation but can also construct the isolated power supply in an emergency case of power supply loss. In this emergency case, EV battery storage control provides the power to critical loads during utility outage. This feature is not available without storage. Also, effectiveness of PV-PCS interconnection stable power supply system with existing residential PCS in Japan was proposed. Moreover, a basic research of solar power generation amount of solar radiation estimation and the resulting simulation on information acquisition method of solar energy capacity using Geographic Information System (GIS) are presented.

Published
2018

28. Racemization on Thermal Degradation of Poly(L-lactide) with Calcium Salt End Structure

Author

Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Shirai, Yoshihito, Endo, Takeshi, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Shirai, Yoshihito, and Endo, Takeshi

Abstract

type:Journal Article, Poly(L-lactide) with calcium salt end structure (PLLA-Ca) is a promising material for PLLA recycling because of the ease of lactide recovery through the unzipping depolymerization process. However, the pyrolysis of PLLA-Ca also causes meso-lactide to form. In this article, the racemization in PLLA-Ca pyrolysis was analyzed in detail with Py-MS, Py-GC/MS, and a glass tube oven. The results suggested that at a temperature lower than 250°C, nucleophilic attack by a carboxylate anion end on an asymmetrical methyne carbon in a penultimate lactate unit occurred, resulting in the predominant formation of meso-lactide. On the other hand, also at temperatures over 320°C, by-reactions, such as enolization reactions, caused the meso-lactide to form, but not dominantly. In the temperature range of 250-320°C, L,L-lactide was produced exclusively, because unzipping depolymerization proceeded as the main reaction. This is a very significant result for PLLA recycling, because PLLA-Ca is an easily recyclable material, which depolymerizes based on the 1st-order weight loss process.

Published
2018

29. Pyrolysis Kinetics of Poly(L-lactide) with Carboxyl and Calcium Salt End Structures

Author

Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Hoshihara, Shinya, Shirai, Yoshihito, Tokiwa, Yutaka, Endo, Takeshi, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Hoshihara, Shinya, Shirai, Yoshihito, Tokiwa, Yutaka, and Endo, Takeshi

Abstract

type:Journal Article, To clarify the pyrolysis mechanism of poly(L-lactide), which has been reported as complex, the thermal decomposition of carboxyl type and calcium ion end capped PLLA (PLLA-H and PLLA-Ca, respectively) was investigated by means of thermogravimetric analysis (TG), and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The TG data revealed that PLLA-Ca has a lower pyrolysis temperature (220~360°C) than that of carboxyl type PLLA-H (280~370°C). The apparent activation energy of the decomposition reaction was estimated from TG curves at different heating rates by plural methods to be 176 and 98 kJ mol-1 for PLLA-H and PLLA-Ca, respectively. Further kinetic studies indicated that PLLA-H degraded mainly through a random reaction with a pre-exponential factor A=2.0×1012 s-1, whereas PLLA-Ca degraded by way of a 1st-order reaction with A=8.4×105 s-1. Pyrolysis products of PLLA-H were composed of lactides and other cyclic oligomers, while the degradation products of PLLA-Ca were principally lactides. The main reaction pathway for PLLA-H pyrolysis was regarded as the random transesterification, whereas for PLLA-Ca pyrolysis the unzipping depolymerization process was dominant.

Published
2018

30. Thermal degradation of poly(L-lactide): effect of alkali earth metal oxides for selective L,L-lactide formation

Author

Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Mori, Tomokazu, Shirai, Yoshihito, Endo, Takeshi, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Fan, Yujiang, Nishida, Haruo, Mori, Tomokazu, Shirai, Yoshihito, and Endo, Takeshi

Abstract

type:Journal Article, To achieve the feed stock recycling of poly(L-lactide) (PLLA) to L,L-lactide, PLLA composites including alkali earth metal oxides, such as calcium oxide (CaO) and magnesium oxide (MgO), were prepared and the effect of such metal oxides on the thermal degradation was investigated from the viewpoint of selective L,L-lactide formation. Metal oxides both lowered the degradation temperature range of PLLA and completely suppressed the production of oligomers other than lactides. CaO markedly lowered the degradation temperature, but caused some racemization of lactide, especially in a temperature range lower than 250 °C. Interestingly, with MgO racemization was avoided even in the lower temperature range. It is considered that the effect of MgO on the racemization is due to the lower basicity of Mg compared to Ca. At temperatures lower than 270 °C, the pyrolysis of PLLA/MgO (5 wt%) composite occurred smoothly causing unzipping depolymerization, resulting in selective L,L-lactide production. A degradation mechanism was discussed based on the results of kinetic analysis. A practical approach for the selective production of L,L-lactide from PLLA is proposed by using the PLLA/MgO composite., source:https://doi.org/10.1016/j.polymer.2003.12.058

Published
2018

31. Effects of poly(L-lactic acid) hydrolysis on attachment of barnacle cypris larvae

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Ishimaru, Nobuyuki, Tsukegi, Takayuki, Wakisaka, Minato, Shirai, Yoshihito, Nishida, Haruo, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Ishimaru, Nobuyuki, Tsukegi, Takayuki, Wakisaka, Minato, Shirai, Yoshihito, and Nishida, Haruo

Abstract

type:Journal Article, Poly(L-lactic acid) (PLLA) applied to immersed solid surfaces in seawater inhibited colonization by barnacles due to the slow-release property of lactic acid. The effect of molecular weight of PLLA on antimacrofouling activity was confirmed for the first time, with the lowest molecular weight PLLA producing the lowest attaching ratio of cypris larvae of Balanus amphitrite. From the direct addition of lactic acid into a culture of cypris larvae, it was found that the anti-barnacle settlement effect was due to the action of slow-released lactic acid to cypris larvae. The anti-macrofouling function of low molecular weight PLLA was also confirmed in a natural sea environment.

Published
2018

32. Effect of tin on poly(L-lactic acid) pyrolysis

Author

Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 820-8502, Japan, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, Yamagata 992-8510, Japan, Nishida, Haruo, Mori, Tomokazu, Hoshihara, Shinya, Fan, Yujiang, Shirai, Yoshihito, Endo, Takeshi, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 820-8502, Japan, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, Yamagata 992-8510, Japan, Nishida, Haruo, Mori, Tomokazu, Hoshihara, Shinya, Fan, Yujiang, Shirai, Yoshihito, and Endo, Takeshi

Abstract

type:Journal Article, Tin 2-ethylhexanoate is an indispensable component of commercially available poly(L-lactic acid) (PLLA). However, the thermal degradation kinetics of PLLA containing Sn have not yet clearly been established; in particular, whether the degradation mechanism is a 1st-order or a random reaction. To clarify the effects of residual Sn on PLLA pyrolysis, PLLA samples with different Sn contents from 20 to 607 ppm were prepared and subjected to pyrolysis analysed with pyrolysis-gas chromatography/mass spectroscopy (Py-GC/MS) and thermogravimetry (TG). The pyrolysis of PLLA Sn-607 (Sn content: 607 ppm) with Py-GC/MS in the temperature range of 40–400 °C selectively produced lactides. In contrast, the pyrolysis of PLLA Sn-20 (Sn content: 20 ppm) was accompanied by the production of cyclic oligomers. The dynamic pyrolysis of PLLA-Sn samples by TG clearly indicated that with an increase in Sn content there was a shift to a lower degradation temperature range and a decrease in activation energy Ea. The kinetic analysis of the dynamic pyrolysis data indicates that the Sn-catalyzed pyrolysis starts through a random degradation behaviour and then shifts to a zero-order weight loss as the main process. Three reactions were put forward as being possible mechanisms of the zero-order weight loss; one being an unzipping reaction accompanying a random transesterification, the other two being the Sn-catalyzed pseudo-selective and selective lactide elimination reactions from random positions on a polymer chain. The kinetic parameter values obtained could be adequately explained for each degradation process.

Published
2018

33. Thermal Stability of Poly (L-lactide): Influence of End Protection by Acetyl Group

Author

Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Yujiang, Fan, Nishida, Haruo, Shirai, Yoshihito, Endo, Takeshi, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan, Yujiang, Fan, Nishida, Haruo, Shirai, Yoshihito, and Endo, Takeshi

Abstract

type:Journal Article, Thermal stability of end-protected poly (L-lactide) (PLLA) was studied by dynamic thermal degradation and pyrolyzate analyses. The treatment of PLLA by acetic anhydride resulted in the acetylation of end hydroxyl groups, and at the same time a decrease in the residual Sn content in the polymer. The thermal degradation of the acetylated PLLA-Ac showed a shift to a 40-50°C higher degradation temperature range than that of untreated, high Sn content PLLA, but exhibited nearly the same degradation behavior as the untreated PLLA with a comparable Sn content. Purified metal-free PLLA-H showed good thermal stability, having the highest degradation temperature range. Interestingly, despite the end-protection, the acetylated metal-free PLLA-H/Ac decomposed at almost the same temperature as that of PLLA-H. From pyrolyzate and kinetic analyses, it was found that the contribution of the hydroxyl-end acetylation to the stability of PLLA was negligible, except for the stabilization effect due to the elimination of residual Sn during the acetylation process.

Published
2018

34. Thermal Degradation Behavior of Poly(Lactic Acid) in a Blend with Polyethylene

Author

Molecular Engineering Institute, Kinki UniVersity, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki UniVersity, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Omura, Masaki, Tsukegi, Takayuki, Shirai, Yoshihito, Nishida, Haruo, Endo, Takeshi, Molecular Engineering Institute, Kinki UniVersity, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan, Molecular Engineering Institute, Kinki UniVersity, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Omura, Masaki, Tsukegi, Takayuki, Shirai, Yoshihito, Nishida, Haruo, and Endo, Takeshi

Abstract

type:Journal Article, Poly(L-lactic acid) (PLLA) is a candidate for feedstock recycling materials, because it easily depolymerizes back into the cyclic monomer, L,L-lactide. To examine the recycling of PLLA from blends with other kinds of polymers, a polymer blend of PLLA and linear low-density polyethylene (LLDPE) was prepared and thermally degraded with a degradation catalyst: magnesium oxide (MgO) in a thermogravimeter/differential thermal analyzer (TG/DTA) and pyrolysis-gas chromatograph/mass spectrometer (Py-GC/MS). To clarify the influence of the LLDPE ingredient in the blend, the thermal degradation data were analyzed kinetically using two simulation methods: integration and random degradation analytical methods. From the results, it was found that PLLA was effectively depolymerized in the presence of MgO into L,L-lactide with a low racemization ratio and that LLDPE had no effect on the feedstock recycling of PLLA., source:http://dx.doi.org/10.1021/ie051446x

Published
2018

35. Biomass-Based Composites from Poly(lactic acid) and Wood Flour by Vapor-Phase Assisted Surface Polymerization

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Kim, Donghee, Andou, Yoshito, Shirai, Yoshihito, Nishida, Haruo, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan, Kim, Donghee, Andou, Yoshito, Shirai, Yoshihito, and Nishida, Haruo

Abstract

type:Journal Article, In order to prepare biomass-based composites in an environmentally benign manner, vapor-phase assisted surface polymerization (VASP) was applied to prepare the composites from wood flour and poly(L-lactic acid) (PLLA) without solvent. VASP of L,L-lactide successfully proceeded on the wood flour surfaces, resulting in surface coverage by newly generated PLLA. For obtained PLLA/wood flour composites, it was clarified that grafting of PLLA on wood flour surfaces had occurred to form covalently bonded composites, with the accumulated PLLA layers having crystallized in situ during VASP. Resulting PLLA layers showed very high crystallinity of 79.2% and a high melting point close to the equilibrium melting point. Moreover, thermal degradation behavior of the composites suggested a cooperative degradation manner of the components., source:http://dx.doi.org/10.1021/am1009953

Published
2018

36. Enhanced polyphenol content and antioxidant capacity in the edible portion of avocado dried with superheated-steam

Author

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Faculty of Applied Sciences, Universiti Teknologi MARA Sarawak, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysiangineering, Kyushu Institute of Technology, Husen, Rafidah, Andou, Yoshito, Ismail, Amin, Shirai, Yoshihito, Hassan, Mohd Ali, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Faculty of Applied Sciences, Universiti Teknologi MARA Sarawak, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysiangineering, Kyushu Institute of Technology, Husen, Rafidah, Andou, Yoshito, Ismail, Amin, Shirai, Yoshihito, and Hassan, Mohd Ali

Abstract

type:Journal Article, In order toevaluatethe effects of drying methods on assay, this present study investigated the effect of superheated-steam drying at three different temperatures (130°C, 150°C and 170°C), in comparison with freeze drying on phenolic and flavonoid contents as well as antioxidant capacities in avocado (Persea americanaMill) pulp. The results showed that superheated-steam dried (SHSD) avocado pulp gave significantly higher total phenolic and total flavonoid contents compared to its freeze dried (FD) counterpart. The IC50 values from the DPPH assay were significantly lower (higher antioxidant activity)in SHSD pulp at all the temperatures used (6.69 – 12.16 mg/ml) compared to FD (35.02 mg/ml). The ORAC values also showed significantly higher radical absorbing capacitywhen SHSD at 170°C (26.58 µmol TE/1g)compared to FD (15.18 µmol TE/1g).The results showed that the drying methods significantly increased antioxidant capacity of SHSD avocado pulp in comparison with the FD.Superheated-steam drying at 170°C is proposed as an appropriate drying technique and condition to preserve pulp in avocado., source:http://www.journalijar.com

Published
2018

37. Effect of Ultrasonic-Assisted Extraction on Phenolic Content of Avocado

Author

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Faculty of Applied Sciences, Universiti Teknologi MARA Sarawak, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Husen, Rafidah, Andou, Yoshito, Ismail, Amin, Shirai, Yoshihito, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Faculty of Applied Sciences, Universiti Teknologi MARA Sarawak, Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Husen, Rafidah, Andou, Yoshito, Ismail, Amin, and Shirai, Yoshihito

Abstract

type:Journal Article, This study evaluate the effect of ultrasonic application in the extraction process on total phenolic content (TPC) of Hass avocado (Persea americana Mill) pulp. In this study, the solid/ solvent ratio of 1/30 (wt/ vol) and extraction temperature of 40 degree Celsius gave higher TPC value. This ratio and temperature was applied in the ultrasonic-assisted extraction (UAE) of avocado pulp. This study then compared the TPC obtained from the avocado pulp extract without involving ultrasonic and the TPC obtained from the UAE. Results showed that the TPC value of avocado pulp was significantly higher in the UAE (235.77 mg GAE/ 100g dried sample) compared to the TPC in the non-UAE (166.32 mg GAE/ 100g dried sample). The increase in the TPC was between ∼31 % and ∼41 % when 5 to 20 min of ultra sonication applied in the extraction. Ultra sonication duration of 15 min gave the highest TPC where the value was significantly higher compared to the other duration., source:http://www.ukm.my/mjas/mjas2018

Published
2018

38. Role of device architecture and AlOX interlayer in organic Schottky diodes and their interpretation by analytical modeling

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 8080196, Japan, Department of Computer Science and Electronics, Kyushu Institute of Technology, 80-4 Kawazu, Iizuka 820-8502, Japan, Kumari, Nikita, Pandey, Manish, Hamada, Kengo, Hirotani, Daisuke, Nagamatsu, Shuichi, Hayase, Shuzi, Pandey, Shyam S., Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 8080196, Japan, Department of Computer Science and Electronics, Kyushu Institute of Technology, 80-4 Kawazu, Iizuka 820-8502, Japan, Kumari, Nikita, Pandey, Manish, Hamada, Kengo, Hirotani, Daisuke, Nagamatsu, Shuichi, Hayase, Shuzi, and Pandey, Shyam S.

Abstract

type:Journal Article, Considering the pivotal role of interfaces in controlling the performance of organic electronic devices, implications of metal/organic interfacial quality in a Schottky barrier diode (SBD) are investigated. The nature of metal/organic interfaces and the thin film quality of regioregular poly (3-hexylthiophene) based SBDs fabricated in different device architectures are investigated using experimental and theoretical modeling. The importance of oxidized aluminum nanostructures as an interlayer at the Schottky interface for the dramatic enhancement of the rectification ratio (>106 at ±5 V) has been demonstrated, which is attributed to suppressed leakage current due to the oxide layer and the formation of a charge double layer. Furthermore, electrical performances of all the SBDs were modeled in terms of an underlying particular phenomenon solely or with the combination of multiple physical phenomena. The combined modeling equation used in this work fits well for the different device architectures, which validates its generality in order to extract the device parameters.

Published
2020

39. Development of catheter-type tactile sensor composed of polyvinylidene fluoride (PVDF) film

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan, Kagawa Prefectural Industrial Technology Center, 587-1 Goto-cho, Takamatsu, 761-8031, Japan, Sensors & Works Co., Ltd., 1-2-25 Wadayamadoori, Kobe, Hyogo, 652-0884, Japan, Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan, Takashima, Kazuto, Ota, Keisuke, Yamamoto, Masaki, Takenaka, Makoto, Horie, Satoshi, Ishida, Kenji, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan, Kagawa Prefectural Industrial Technology Center, 587-1 Goto-cho, Takamatsu, 761-8031, Japan, Sensors & Works Co., Ltd., 1-2-25 Wadayamadoori, Kobe, Hyogo, 652-0884, Japan, Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan, Takashima, Kazuto, Ota, Keisuke, Yamamoto, Masaki, Takenaka, Makoto, Horie, Satoshi, and Ishida, Kenji

Abstract

type:Journal Article, To achieve quantitative palpation in vivo, we developed a catheter-type tactile sensor composed of a polyvinylidene fluoride film for minimally invasive surgery. We evaluated the fundamental performance of the prototype sensor by a weight-drop test. We also measured the output of the prototype sensor as it was inserted into a blood vessel model with shapes mimicking lesions. The ø2-mm sensor passed easily into the blood vessel model with lesion-like shapes. Sensor outputs corresponded to the shape of the inner wall of the blood vessel model, making it possible to determine the position of a protrusion and the convexity interval of a rough surface by filtering and frequency analysis of the output.

Published
2020

40. A framework for robotic clothing assistance by imitation learning

Author

Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Wakamatsu, Kitakyushu, Japan, Graduate School of Information Science, Nara Institute of Science and Technology, Ikoma, Nara, Japan, Joshi, R. P., Koganti, N., Shibata, T., Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Wakamatsu, Kitakyushu, Japan, Graduate School of Information Science, Nara Institute of Science and Technology, Ikoma, Nara, Japan, Joshi, R. P., Koganti, N., and Shibata, T.

Abstract

type:Journal Article, The recent demographic trend across developed nations shows a dramatic increase in the aging population, fallen fertility rates and a shortage of caregivers. Hence, the demand for service robots to assist with dressing which is an essential Activity of Daily Living (ADL) is increasing rapidly. Robotic Clothing Assistance is a challenging task since the robot has to deal with two demanding tasks simultaneously, (a) non-rigid and highly flexible cloth manipulation and (b) safe human–robot interaction while assisting humans whose posture may vary during the task. On the other hand, humans can deal with these tasks rather easily. In this paper, we propose a framework for robotic clothing assistance by imitation learning from a human demonstration to a compliant dual-arm robot. In this framework, we divide the dressing task into three phases, i.e. reaching phase, arm dressing phase, and body dressing phase. We model the arm dressing phase as a global trajectory modification using Dynamic Movement Primitives (DMP), while we model the body dressing phase toward a local trajectory modification applying Bayesian Gaussian Process Latent Variable Model (BGPLVM). We show that the proposed framework developed towards assisting the elderly is generalizable to various people and successfully performs a sleeveless shirt dressing task. We also present participants feedback on public demonstration at the International Robot Exhibition (iREX) 2017. To our knowledge, this is the first work performing a full dressing of a sleeveless shirt on a human subject with a humanoid robot., source:http://www.tandfonline.com/10.1080/01691864.2019.1636715

Published
2020

41. Life Cycle Assessment for Bioethanol Production from Oil Palm Frond Juice in an Oil Palm Based Biorefinery

Author

Department of Food and Process Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, School of Bioprocess Engineering, Universiti Malaysia Perlis, Perlis 02600, Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and Bioengineering Technology (UniKL MICET), Lot 1988, Kawasan Perindustrian, Bandar Vendor, Alor Gajah 78000, Malaysia, Department of Food and Process Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Fukuoka 808-0916, Japan, Yusof, Siti Jamilah Hanim Mohd, Roslan, Ahmad Muhaimin, Khairul, Nadiah Ibrahim, Abdullah, Sharifah Soplah Syed, Zakaria, Mohd Rafein, Hassan, Mohd Ali, Shirai, Yoshihito, Department of Food and Process Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, School of Bioprocess Engineering, Universiti Malaysia Perlis, Perlis 02600, Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and Bioengineering Technology (UniKL MICET), Lot 1988, Kawasan Perindustrian, Bandar Vendor, Alor Gajah 78000, Malaysia, Department of Food and Process Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia, Department of Biological Functions and Engineering, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Fukuoka 808-0916, Japan, Yusof, Siti Jamilah Hanim Mohd, Roslan, Ahmad Muhaimin, Khairul, Nadiah Ibrahim, Abdullah, Sharifah Soplah Syed, Zakaria, Mohd Rafein, Hassan, Mohd Ali, and Shirai, Yoshihito

Abstract

type:Journal Article, A study was conducted to estimate the possible environmental impacts arising from the generation of bioethanol from oil palm frond sugar juice in a theoretical oil palm based biorefinery model. A life cycle assessment (LCA) with the gate-to-gate approach was performed with the aid of SimaPro version 8.0 whereby ten impact categories were evaluated. The scope included frond collection and transportation, frond sugar juice extraction, and bioethanol fermentation and purification. Evaluation on the processes involved indicated that fermentation contributed to the environmental problems the most, with a contribution range of 52% to 97% for all the impact categories. This was due to a substantial usage of nutrient during this process, which consumes high energy for its production thus contributing a significant burden to the surrounding. Nevertheless, the present system offers a great option for biofuel generation as it utilizes sugar juice from the readily available oil palm waste. Not only solving the issue of land utilization for feedstock cultivation, the enzymatic saccharification step, which commonly necessary for lignocellulosic sugar recovery could also be eliminated., source:https://doi.org/10.3390/su11246928

Published
2020

42. Mid-infrared absorption of trapped electrons in titanium(IV) oxide particles using a photoacoustic FTIR technique

Author

Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, Shinodab, Tatsuki, Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, and Shinodab, Tatsuki

Abstract

type:Journal Article, Mid-infrared absorption of titanium(IV) oxide (TiO2) under ultraviolet (UV) irradiation was studied by Fourier transform infrared spectroscopy using a photoacoustic (PA) technique. UV irradiation induced an upward shift of the PA spectra, which is due to the trivalent titanium (Ti3+) species produced by electron accumulation. The PA spectra under UV irradiation mainly depend on the crystal structure, indicating that the energy levels of Ti3+ are largely determined by crystal structures., source:https://doi.org/10.1039/C8CP04885A

Published
2020

43. Dependency of Parameter Values in Reinforcement Learning for Navigation of a Mobile Robot on the Environment

Author

Department of Brain Science and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka, 808-0196, Japan, Kamei, Keiji, Ishikawa, Masumi, Department of Brain Science and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka, 808-0196, Japan, Kamei, Keiji, and Ishikawa, Masumi

Abstract

type:Journal Article, Reinforcement learning is suitable for navigation of a mobile robot due to its ability without supervised information. Reinforcement learning, however, has difficulties. One is its slow learning, and the other is the necessity of specifying its parameter values without prior information. We proposed to introduce sensory signals into reinforcement learning to improve its learning performance, and to optimize its parameter values by a genetic algorithm with inheritance. The latter has to specify the parameter values for every environment, which is impractical due to huge computational time. In this paper, we propose to analyze the dependency and sensitivity of the values of parameters on the environment for predicting the values of parameters for a novel environment without optimization process. We examine the dependency and the sensitivity of the values of parameters of the environment. The computer experiments clarify the dependency of the values of parameters on the environment and provide their sensitivities.

Published
2020

44. Operando Analysis of Electron Accumulation in Titanium(IV) Oxide Particles in an Aqueous Suspension Using a Photoacoustic Spectroscopic Method

Author

Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, Shinoda, Tatsuki, Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550, Japan, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan, Murakami, Naoya, and Shinoda, Tatsuki

Abstract

type:Journal Article, The time course of photoabsorption of an aqueous suspension of titanium(IV) oxide (TiO2) particles was studied using photoacoustic (PA) spectroscopy. In the absence of an electron acceptor and the presence of an electron donor, ultraviolet irradiation increased PA intensity because photoabsorption of the suspension increased due to trivalent titanium (Ti3+) species generated by electron accumulation in TiO2 particles. In contrast, the addition of methylene blue (MB) as an acceptor caused a decrease in PA intensity, indicating that accumulated electrons were consumed by reduction of MB to colorless leuco-MB. The results for various TiO2 particles indicated that Ti3+ density is determined by this method. Moreover, the measurement can be applicable to quantitative operando analysis for accumulated electrons in a photocatalytic reaction., source:https://doi.org/10.1021/acs.jpcc.8b10566

Published
2020

45. Implications of doping and depletion on the switching characteristics in polymer-based organic field-effect transistors

Author

Department of Electronics Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, 808-0196, Japan, Department of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan, School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India, Tiwari, Shashi, Pandey, Manish, Takashima, Wataru, Nagamatsu, Shuichi, Balasubramanian, S.K., Hayase, Shuzi, Pandey, Shyam S., Prakash, Rajiv, Department of Electronics Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, 808-0196, Japan, Department of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan, School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India, Tiwari, Shashi, Pandey, Manish, Takashima, Wataru, Nagamatsu, Shuichi, Balasubramanian, S.K., Hayase, Shuzi, Pandey, Shyam S., and Prakash, Rajiv

Abstract

type:Journal Article, An effective approach for tuning the electronic characteristics of polymer-based organic field-effect transistors (OFETs) consisted of poly(3-hexylthiophene) (P3HT) doped with 7,7,8,8-tetracyanoquinodimethane (TCNQ) and depleting layer formed by aluminum (Al) coating is being reported. Doping of P3HT was employed to accumulate and tune the carrier concentration while implementation of depletion layer led to reduce the channel conductance. It has been demonstrated that on-currents in the OFETs were enhanced with the extent of TCNQ doping from 0% to 20% in the P3HT. Upon introduction of an ultra-thin Al led to the formation of depletion region resulting in to further decrease in the off-state current along with the improvement in the subthreshold characteristics. These two procedures provide counter-effects in terms of the on-state characteristics by doping and the off-state characteristics by depletion, which promotes switching performance in OFETs indicating the potentiality of doping technology for organic electronics., source:https://doi.org/10.1016/j.orgel.2018.02.012

Published
2020

46. Implication of Molecular Weight on Optical and Charge Transport Anisotropy in PQT-C12 Films Fabricated by Dynamic FTM

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan, Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, 820-8502, Japan, Tripathi, Atul S. M., Sadakata, Shifumi, Gupta, Rakesh Kumar, Nagamatsu, Shuichi, Ando, Yoshito, Pandey, Shyam S., Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan, Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, 820-8502, Japan, Tripathi, Atul S. M., Sadakata, Shifumi, Gupta, Rakesh Kumar, Nagamatsu, Shuichi, Ando, Yoshito, and Pandey, Shyam S.

Abstract

type:Journal Article, Large area (>20 cm × 2 cm)-oriented thin films of PQT-C12 with varying molecular weight and polydispersity index (PDI) were fabricated by the ribbon-shaped floating film transfer method aiming toward their application as an active semiconductor element of organic field effect transistors (OFETs). Investigation on the influence of the molecular weight and PDI upon the extent of molecular alignment and anisotropic charge transport was systematically carried out. It has been demonstrated that high molecular weight in combination with low PDI not only leads to a very high optical anisotropy >10 but also high charge carrier anisotropy with a hole mobility of about 0.07 cm2/V·s for OFETs using parallel-oriented PQT-C12 thin films. Such a structure–property correlation is highly beneficial for the development of high performance organic electronic devices by synergistic and amicable tuning of the optoelectronic anisotropies and polymer synthetic variables., source:https://doi.org/10.1021/acsami.9b06568

Published
2020

47. Ultrafast selective extraction of hot holes from cesium lead iodide perovskite films

Author

Department of Engineering Science, Faculty of Informatics and Engineering, The University of Electro-Communications, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fonctions Optiques pour les Technologies de l'information, Shen, Qing, Ripolles, Teresa S., Even, Jacky, Zhang, Yaohong, Ding, Chao, Liu, Feng, Izuishi, Takuya, Nakazawa, Naoki, Toyoda, Taro, Ogomi, Yuhei, Hayase, Shuzi, Department of Engineering Science, Faculty of Informatics and Engineering, The University of Electro-Communications, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fonctions Optiques pour les Technologies de l'information, Shen, Qing, Ripolles, Teresa S., Even, Jacky, Zhang, Yaohong, Ding, Chao, Liu, Feng, Izuishi, Takuya, Nakazawa, Naoki, Toyoda, Taro, Ogomi, Yuhei, and Hayase, Shuzi

Abstract

type:Journal Article, Lead halide perovskites have some unique properties which are very promising for optoelectronic applications such as solar cells, LEDs and lasers. One important and expected application of perovskite halide semiconductors is solar cell operation including hot carriers. This advanced solar cell concept allows overcoming the Shockley–Queisser efficiency limit, thereby achieving energy conversion efficiency as high as 66% by extracting hot carriers. Understanding ultrafast photoexcited carrier dynamics and extraction in lead halide perovskites is crucial for these applications. Here, we clarify the hot carrier cooling and transfer dynamics in all-inorganic cesium lead iodide (CsPbI3) perovskite using transient absorption spectroscopy and Al2O3, poly(3-hexylthiophene-2,5-diyl) (P3HT) and TiO2 as selective contacts. We find that slow hot carrier cooling occurs on a timescale longer than 10 ps in the cases of CsPbI3/Al2O3 and CsPbI3/ TiO2, which is attributed to hot phonon bottleneck for the high photoexcited carrier density. An efficient ultrafast hole transfer from CsPbI3 to the P3HT hole extracting layer is observed. These results suggest that hot holes can be extracted by appropriate selective contacts before energy dissipation into the halide perovskite lattice and that CsPbI3 has a potential for hot carrier solar cell applications., source:https://doi.org/10.1016/j.jechem.2018.01.006

Published
2020

48. High performance loop closure detection using bag of word pairs

Author

Innovation Labs, Tata Consultancy Services, New Delhi, India, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Japan, Kejriwal, Nishant, Kumar, Swagat, Shibata, Tomohiro, Innovation Labs, Tata Consultancy Services, New Delhi, India, Graduate School of Life Science and System Engineering, Kyushu Institute of Technology, Japan, Kejriwal, Nishant, Kumar, Swagat, and Shibata, Tomohiro

Abstract

type:Journal Article, In this paper, we look into the problem of loop closure detection in topological mapping. The bag of words (BoW) is a popular approach which is fast and easy to implement, but suffers from perceptual aliasing, primarily due to vector quantization. We propose to overcome this limitation by incorporating the spatial co-occurrence information directly into the dictionary itself. This is done by creating an additional dictionary comprising of word pairs, which are formed by using a spatial neighborhood defined based on the scale size of each point feature. Since the word pairs are defined relative to the spatial location of each point feature, they exhibit a directional attribute which is a new finding made in this paper. The proposed approach, called bag of word pairs (BoWP), uses relative spatial co-occurrence of words to overcome the limitations of the conventional BoW methods. Unlike previous methods that use spatial arrangement only as a verification step, the proposed method incorporates spatial information directly into the detection level and thus, influences all stages of decision making. The proposed BoWP method is implemented in an on-line fashion by incorporating some of the popular concepts such as, K-D tree for storing and searching features, Bayesian probabilistic framework for making decisions on loop closures, incremental creation of dictionary and using RANSAC for confirming loop closure for the top candidate. Unlike previous methods, an incremental version of K-D tree implementation is used which prevents rebuilding of tree for every incoming image, thereby reducing the per image computation time considerably. Through experiments on standard datasets it is shown that the proposed methods provide better recall performance than most of the existing methods. This improvement is achieved without making use any geometric information obtained from range sensors or robot odometry. The computational requirements for the algorithm is comparable to that of BoW, source:https://doi.org/10.1016/j.robot.2015.12.003

Published
2020

49. High Electrical Conductivity 2D MXene Serves as Additive of Perovskite for Efficient Solar Cells

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka, 808‐0196 Japan, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin, 124221 P. R. China, Guo, Zhanglin, Gao, Liguo, Xu, Zhenhua, Teo, Siowhwa, Zhang, Chu, Kamata, Yusuke, Hayase, Shuzi, Ma, Tingli, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka, 808‐0196 Japan, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin, 124221 P. R. China, Guo, Zhanglin, Gao, Liguo, Xu, Zhenhua, Teo, Siowhwa, Zhang, Chu, Kamata, Yusuke, Hayase, Shuzi, and Ma, Tingli

Abstract

type:Journal Article, MXenes, a newly intriguing family of 2D materials, have recently attracted considerable attention owing to their excellent properties such as high electrical conductivity and mobility, tunable structure, and termination groups. Here, the Ti3C2Tx MXene is incorporated into the perovskite absorber layer for the first time, which aims for efficiency enhancement. Results show that the termination groups of Ti3C2Tx can retard the crystallization rate, thereby increasing the crystal size of CH3NH3PbI3. It is found that the high electrical conductivity and mobility of MXene can accelerate the charge transfer. After optimizing the key parameters, 12% enhancement in device performance is achieved by 0.03 wt% amount of MXene additive. This work unlocks opportunities for the use of MXene as potential materials in perovskite solar cell applications., source:https://doi.org/10.1002/smll.201802738

Published
2019

50. Object Recognition System using Deep Learning with Depth Images for Service Robots

Author

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan, Yoshimoto, Yuma, Tamukoh, Hakaru, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan, Yoshimoto, Yuma, and Tamukoh, Hakaru

Abstract

type:Conference Paper, In an aging society with fewer children, service robots are expected to play an increasingly important role in people’s lives. To realize a future with service robots, a generic object recognition system is necessary to recognize a wide variety of objects with a high degree of accuracy. Therefore, this study employs deep convolutional neural networks for the generic object recognition system. To improve the accuracy of object recognition, both RGB images and depth images can be used effectively. In this paper, we propose a new architecture “Dual Stream - VGG16 (DS-VGG16)” for a deep convolutional neural network to train both the RGB images and depth images, and we also present a new training method for the proposed architecture. The experimental results indicate that the proposed architecture and training method are effective. Finally, we develop an object recognition system based on the proposed method that has an interface of robot operating system for integrating the system into service robots., 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2018), 27 - 30, November 2018, Okinawa, Japan

Published
2019

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