52 results on '"Minghui He"'
Search Results
2. Polymerizable deep eutectic solvent-based mechanically strong and ultra-stretchable conductive elastomers for detecting human motions
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Guangxue Chen, Ren'ai Li, Minghui He, Jimin Yang, Junfei Tian, and Kaili Zhang
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Toughness ,Materials science ,Renewable Energy, Sustainability and the Environment ,02 engineering and technology ,General Chemistry ,Conductivity ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Elastomer ,01 natural sciences ,Flexible electronics ,0104 chemical sciences ,Deep eutectic solvent ,chemistry.chemical_compound ,chemistry ,Ultimate tensile strength ,General Materials Science ,Composite material ,0210 nano-technology ,Electrical conductor ,Eutectic system - Abstract
Conductive elastomers (CEs) with strong mechanical properties have been fabricated and used in flexible electronics. However, the development of CEs with both super-high mechanical strength and extreme stretchability remains challenging. This paper reports on the development of a series of mechanically strong and tough CEs based on photopolymerizable deep eutectic solvents (PDESs) with dense hydrogen bonding interactions. One of these CEs exhibits the highest reported mechanical performance for elastomers, with tensile strength, strain at break and toughness up to 31.21 MPa, 3645% and 615 MJ m−3, respectively. Notably, this CE tolerates puncture and can lift a 10.5 kg weight (9500 times its own weight) without any failure. In addition, the series of CEs also shows excellent transparency (>94% in the visible range), favorable conductivity (0.007–0.04 S m−1), tunable stretchability (strain from 22% to 6164%) and good self-healing capability (electrical healing efficiency of 99% within 0.26 s). In view of the comprehensive properties of the CEs, we demonstrate the practical suitability of CEs by including them in a strain sensor to detect human motion. Based on their extremely facile preparation process and practical functionalities, we believe that CEs will not only contribute new methods for the development of mechanically strong conductors, but also open up novel avenues for flexible electronics.
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- 2021
3. Cellulose Nanofiber-Reinforced Ionic Conductors for Multifunctional Sensors and Devices
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Xiao Feng, Chao Dang, Ming Wang, Xueqiong Yin, Detao Liu, Minghui He, Ren'ai Li, Fanglin Dai, and Haisong Qi
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Materials science ,Compressive Strength ,Nanofibers ,Ionic bonding ,Hydrogels ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Flexible electronics ,0104 chemical sciences ,Conductor ,chemistry.chemical_compound ,Compressive strength ,chemistry ,Bacterial cellulose ,Tensile Strength ,Nanofiber ,Ultimate tensile strength ,Solvents ,General Materials Science ,Composite material ,Cellulose ,0210 nano-technology ,Electrical conductor - Abstract
Ionic conductors are normally prepared from water-based materials in the solid form and feature a combination of intrinsic transparency and stretchability. The sensitivity toward humidity inevitably leads to dehydration or deliquescence issues, which will limit the long-term use of ionic conductors. Here, a novel ionic conductor based on natural bacterial cellulose (BC) and polymerizable deep eutectic solvents (PDESs) is developed for addressing the abovementioned drawbacks. The superstrong three-dimensional nanofiber network and strong interfacial interaction endow the BC-PDES ionic conductor with significantly enhanced mechanical properties (tensile strength of 8 × 105 Pa and compressive strength of 6.68 × 106 Pa). Furthermore, compared to deliquescent PDESs, BC-PDES composites showed obvious mechanical stability, which maintain good mechanical properties even when exposed to high humidity for 120 days. These materials were demonstrated to possess multiple sensitivity to external stimulus, such as strain, pressure, bend, and temperature. Thus, they can easily serve as supersensitive sensors to recognize physical activity of humans such as limb movements, throat vibrations, and handwriting. Moreover, the BC-PDES ionic conductors can be used in flexible, patterned electroluminescent devices. This work provides an efficient strategy for making cellulose-based sustainable and functional ionic conductors which have broad application in artificial flexible electronics and other products.
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- 2020
4. Autonomous Self-Healing, Antifreezing, and Transparent Conductive Elastomers
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Ting Fan, Ren'ai Li, Guangxue Chen, Minghui He, Bin Su, Junfei Tian, and Kaili Zhang
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Materials science ,General Chemical Engineering ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Elastomer ,01 natural sciences ,0104 chemical sciences ,Molecular network ,Self-healing ,Materials Chemistry ,0210 nano-technology ,Electrical conductor - Abstract
It is a challenge to synthesize all-in-one molecular networks that are autonomously self-healable over a wide temperature range (from subzero to high), transparent, stretchable, and conductive. Her...
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- 2020
5. Transparent conductive elastomers with excellent autonomous self-healing capability in harsh organic solvent environments
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Guangxue Chen, Kaili Zhang, Minghui He, Ting Fan, and Ren'ai Li
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Materials science ,Renewable Energy, Sustainability and the Environment ,Organic solvent ,Supramolecular chemistry ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Elastomer ,01 natural sciences ,0104 chemical sciences ,Deep eutectic solvent ,chemistry.chemical_compound ,Monomer ,chemistry ,Self-healing ,General Materials Science ,0210 nano-technology ,Electrical conductor - Abstract
A new type of supramolecular elastomer, photopolymerized from two rationally designed polymerizable deep eutectic solvent (PDES) monomers, was reported. The resultant network was highly transparent, intrinsically conductive, stretchable, and self-healable. In particular, the healing process can even take place in various organic solvents, simultaneously with enhanced adaptability.
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- 2020
6. Ultrastretchable and Antifreezing Double-Cross-Linked Cellulose Ionic Hydrogels with High Strain Sensitivity under a Broad Range of Temperature
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Ren'ai Li, Guangxue Chen, Haisong Qi, Fachuang Lu, Junfei Tian, Ruiping Tong, Minghui He, and Danhong Pan
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Materials science ,Renewable Energy, Sustainability and the Environment ,General Chemical Engineering ,Natural polymers ,Ionic bonding ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Sensitivity (explosives) ,0104 chemical sciences ,High strain ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Self-healing hydrogels ,Environmental Chemistry ,Ionic conductivity ,Ammonium persulfate ,0210 nano-technology ,Electrical conductor - Abstract
Stretchable and antifreezing conductive hydrogels, especially prepared from natural polymers, are beneficial for important and rapidly growing stretchable electronic devices. Unfortunately, the pot...
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- 2019
7. Preparation of high-density garnet thin sheet electrolytes for all-solid-state Li-Metal batteries by tape-casting technique
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Yi-Peng Zhang, Kang-Ning Gao, Zhonghui Cui, Xixiang Li, Jun Gao, Minghui He, Yiqiu Li, Tao Zhang, and Zhongliang Zhan
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Tape casting ,Materials science ,Mechanical Engineering ,Metals and Alloys ,Sintering ,02 engineering and technology ,Electrolyte ,Thin sheet ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Metal ,Mechanics of Materials ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Relative density ,Ionic conductivity ,Composite material ,0210 nano-technology - Abstract
Garnet electrolyte is a promising candidate for the development of all-solid-state Li-metal batteries, because of its safety and stability against Li metal. However, its practical application is limited by the difficulty in production of its high-density thin sheet. In this work, we have fabricated garnet thin sheet electrolytes (Li6.4La3Zr1.4Ta0.6O12, LLZTO) by tape-casting technique. By using Li2O as a liquid-phase sintering additive, a high relative density up to 99% was achieved. Electrochemical results show the LLZTO sheets have an ionic conductivity of 5.2 × 10−4 S cm−1 at 30 °C and good cycling stability against Li metal. Based on the sheets, all-solid-state Li/LLZTO/LiFePO4 batteries exhibit excellent reversible cycles at 60 °C and 0.1C with an initial discharge specific capacity of 125.8 mA h g−1 and a retention of 92.3% after 50 cycles. These results indicate that the tape-casting process demonstrated here provides an effective method of producing high-density garnet thin sheet electrolytes for high-performance all-solid-state Li-metal batteries.
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- 2019
8. Nanocomposite intermediate layers formed by conversion reaction of SnO2 for Li/garnet/Li cycle stability
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Jingming Fu, Xiangxin Guo, Hanyu Huo, Yiqi Li, Fangfang Xu, Minghui He, Yue Chen, Tao Zhang, and Ning Zhao
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Chemical substance ,Materials science ,Nanocomposite ,Renewable Energy, Sustainability and the Environment ,Alloy ,Energy Engineering and Power Technology ,02 engineering and technology ,Electrolyte ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,Magazine ,Chemical engineering ,Coating ,law ,Fast ion conductor ,engineering ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Science, technology and society - Abstract
Garnets are promising solid electrolytes for developing solid state Li batteries, owing to their features of relatively high conductivity and stability against lithium metal. However, they show shortcoming of Li penetration through garnets during Li plating and stripping, which limits their practice application. Herein, we present a strategy to solve such problem by coating SnO2 films on the surfaces of the Li6·4La3Zr1·4Ta0·6O12 pellets. Through conversion reaction of SnO2 with Li at 200 °C, the nanocomposite layers consisting of crosslinked LixSn and Li2O are formed between the Li and the Li6·4La3Zr1·4Ta0·6O12 electrolytes. This leads to transition from lithiophobicity to lithiophilicity, thus greatly reducing interfacial resistance from 1100 Ω cm2 to 25 Ω cm2. Furthermore, taking advantage of suppressing volume change of LixSn alloy which is about 260%, the intermediate layers maintain integrity under the current densities of 0.2 mA cm−2 for 650 h cycles. In addition, the critical current density of Li/SnO2-Li6.4La3Zr1·4Ta0·6O12-SnO2/Li can be as high as 1.15 mA cm−2. As a proof-of-concept, this effective interface modification based on conversion reaction method contributes to a useful way of solving the Li/garnet interface problem and promoting the solid state Li batteries development.
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- 2019
9. Angle-shaped triboelectric nanogenerator for harvesting environmental wind energy
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Hongbin Lin, Qingshen Jing, Shutang Wang, Yaoli Zhang, Yannan Xie, Minghui He, Weifeng Yang, Lianhui Wang, Yanwen Ma, Ning Li, Jing Li, and Ying Liu
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Wind power ,Materials science ,Renewable Energy, Sustainability and the Environment ,business.industry ,Nanogenerator ,02 engineering and technology ,Electrostatic induction ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Engineering physics ,Wind speed ,0104 chemical sciences ,law.invention ,Capacitor ,law ,General Materials Science ,Electrical and Electronic Engineering ,0210 nano-technology ,Contact electrification ,business ,Contact area ,Triboelectric effect - Abstract
Recently, flutter-driven triboelectric nanogenerator (TENG) has shown huge potential in wind energy harvesting from ambient environments. However, almost all the reported devices are based on parallel structure which suffers from a critical problem of insufficient contact between triboelectric surfaces. In this work, we propose an angle-shaped TENG (AS-TENG) with the above issue resolved. The device is based on two Al layers stacked to form an angle shape and a FEP film positioned in between by sharing a common side. Thanks to this design, the FEP film can contact fully and intimately with the Al layers to facilitate the effect of contact electrification and electrostatic induction. Compared with the existing parallel-structured TENG, the AS-TENG shows an overwhelming output performance because of the enhanced contact area. Furthermore, the AS-TENG is introduced a wedge-shaped wind guide channel which can provide a driving force for the flutter and hence lower the start-up wind speed largely. To further enhance the electric output, the AS-TENGs can be facilely integrated into a 360° radial array, showing an enlarged windward area and a high level of integration. The AS-TENG array can be applied to harvest outdoor weak wind and act as a direct power source to charge a capacitor or drive electronic devices. This work provides a design strategy for natural weak wind scavenging which may push forward the practical applications of TENG for wind power.
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- 2019
10. Incorporation of bifunctional aminopyridine into an NbO-type MOF for the markedly enhanced adsorption of CO2 and C2H2 over CH4
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Zhenzhen Jiang, Minghui He, Fengjie Xia, Tingting Xu, Ying Zou, Xiaojuan Wang, Xia Wang, Yabing He, and Luyao Yang
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Ligand ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Adsorption ,chemistry ,Functional group ,Amine gas treating ,0210 nano-technology ,Bifunctional ,Porosity ,Natural bond orbital - Abstract
The development of porous MOFs exhibiting highly selective C2H2/CH4 and CO2/CH4 separations is quite important to meet the requirement of high-purity C2H2 and CH4 in various industries. By employing a ligand heterobifunctionalization strategy, we designed and synthesized an aminopyridine-functionalized diisophthalate ligand, and successfully targeted its corresponding copper-based NbO-type MOF ZJNU-98. Gas adsorption studies revealed that ZJNU-98 exhibited significantly enhanced adsorption of C2H2 and CO2 over CH4 compared to its parent MOF, NOTT-101. At 298 K and 1 atm, C2H2 and CO2 uptakes of ZJNU-98 are 10.0% and 16.7% higher than the corresponding values of NOTT-101, while 14.2% and 18.8% increases in C2H2/CH4 and CO2/CH4 adsorption selectivities were observed for the equimolar gas mixtures in ZJNU-98 compared to NOTT-101. Furthermore, the contribution of the functional group effect on gas adsorption has been assessed, demonstrating that the amine group plays a more important role than the pyridinic-N atom despite its lower Lewis basicity. This work provided an effective way and significant experimental evidence for the design of new porous MOFs with highly enhanced gas adsorption performance.
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- 2019
11. Effect of arrangement of functional groups on stability and gas adsorption properties in two regioisomeric copper bent diisophthalate frameworks
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Yabing He, Tingting Xu, Xiaoxia Gao, Minghui He, and Zhenzhen Jiang
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Work (thermodynamics) ,Materials science ,Bent molecular geometry ,Substituent ,chemistry.chemical_element ,Gas uptake ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Copper ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,chemistry ,Chemical engineering ,General Materials Science ,Desolvation ,0210 nano-technology ,Porosity - Abstract
The structure–property relationship investigation is of prime importance to development of porous MOFs exhibiting better performance. In this work, two regioisomeric diisophthalate ligands, with the only difference being the position of methyl and amino groups with respect to isophthalate moieties, were rationally designed and synthesized, and their corresponding dicopper paddlewheel-based MOFs were successfully fabricated under suitable solvothermal conditions. Single-crystal X-ray diffraction studies showed that they displayed the same network topology of ssa type, thus providing a platform to investigate the impact of the substituent's arrangement on gas adsorption properties. As revealed by gas adsorption studies, the pore textural properties and gas uptake capacities with respect to C2H2, CO2, and CH4 of ZJNU-11 are significantly higher than those of its isomer ZJNU-12 despite their same structures, indicating that the arrangement of functional groups makes a difference to the framework stabilities against desolvation and thus to the gas adsorption properties. In addition, ZJNU-11 is also capable of selectively adsorptive separation of C2H2 and CO2 from CH4, with high C2H2/CH4 (v/v, 1/1) and CO2/CH4 (v/v, 1/1) adsorption selectivities of 36.2 and 5.9 at 298 K and 1 atm. This work not only reported a porous MOF material for highly selective C2H2/CH4 and CO2/CH4 separations, but also demonstrated that the rational arrangement of substituent groups will be favorable to improve the MOF's stabilities and thus gas adsorption properties, which needs to be taken into account upon design and construction of porous MOFs.
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- 2019
12. Two copper-based MOFs constructed from a linear diisophthalate linker: supramolecular isomerism and gas adsorption properties
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Minghui He, Xinjian Yu, Luyao Yang, Xia Wang, Yabing He, Ying Zou, Zhenzhen Jiang, Tingting Xu, and Xiaojuan Wang
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Diffraction ,Ligand ,Supramolecular chemistry ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Copper ,0104 chemical sciences ,Adsorption selectivity ,Crystallography ,Adsorption ,chemistry ,General Materials Science ,Desolvation ,0210 nano-technology ,Linker - Abstract
Combining a linear diisophthalate ligand, 5,5′-(2,3-dimethylbenzene-1,4-diyl)diisophthalic acid, with CuCl2·2H2O under different solvothermal conditions afforded two distinct copper-based metal–organic frameworks (ZJNU-96 and ZJNU-97), which were structurally characterized by various techniques. Single-crystal X-ray diffraction analyses reveal that they contain the same inorganic and organic building units but exhibit different topological structures, thus belonging to supramolecular isomers. Furthermore, gas adsorption studies show that ZJNU-96 not only exhibits better stability against desolvation than ZJNU-97 but also displays promising potential for selective adsorptive separation of C2H2 and CO2 from CH4, with C2H2 (CO2) uptake of 183.6 (88.7) cm3 (STP) g−1 and C2H2 (CO2)/CH4 (v/v, 50/50) IAST adsorption selectivity of 26.6 (5.2) at 298 K and 1 atm.
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- 2019
13. Tailoring the structures and gas adsorption properties of copper–bent diisophthalate frameworks by a substituent-driven ligand conformation regulation strategy
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Yabing He, Minghui He, Tingting Xu, Zhenzhen Jiang, and Xiaoxia Gao
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Pore size ,Ligand ,Bent molecular geometry ,Substituent ,Structural diversity ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Combinatorial chemistry ,Copper ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,chemistry ,General Materials Science ,0210 nano-technology ,Topology (chemistry) - Abstract
Tailoring the structures and properties of metal–organic frameworks (MOFs) is very important for developing porous MOFs for targeted applications. Bent diisophthalate ligands offer a rich opportunity to construct MOFs with variable topologies because of their conformation flexibility and diversity. In this work, by employing a substituent-induced ligand conformation regulation strategy, we designed and synthesized three bent diisophthalate ligands bearing different substituents, and successfully constructed their corresponding dicopper paddlewheel-based MOFs under suitable solvothermal conditions. As revealed by single-crystal structural analyses, they feature distinct topological structures, depending on the attached substituents. Interestingly, the methoxy-functionalized MOF exhibits a novel topology, thus enriching the structural diversity of copper-bent diisophthalate frameworks. Furthermore, their gas adsorption properties with respect to C2H2, CO2, and CH4 were systematically investigated, revealing their promising potential for industrially important C2H2/CH4 and CO2/CH4 separations. More significantly, their separation performance can be greatly tailored by changing the substituents. Under ambient conditions, C2H2 and CO2 uptake capacities vary from 157.7 to 184.5 cm3 (STP) g−1, and 90.8 to 101.3 cm3 (STP) g−1, respectively, while C2H2/CH4 (50/50, v/v) and CO2/CH4 (50/50, v/v) adsorption selectivities range from 30.0 to 36.2, and 5.27 to 6.01, respectively. The amino-functionalized MOF performed better than the other two counterparts, which might be due to the synergistic effect arising from Lewis basic amino groups, higher density of open copper sites, and more suitable pore size. This work not only reported three MOFs for preferable adsorption of C2H2 and CO2 over CH4, but also demonstrated that the substituent-driven ligand conformation regulation is a facile way to modulate the structures and thus gas adsorption properties of MOFs.
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- 2019
14. A ligand conformation preorganization approach to construct a copper–hexacarboxylate framework with a novel topology for selective gas adsorption
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Xiaoxia Gao, Minghui He, Guohai Xu, Yao Wang, Xia Wang, Yabing He, and Zhengyi Zhang
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Hexacarboxylate ,Materials science ,Atmospheric pressure ,Ligand ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Topology ,01 natural sciences ,Copper ,0104 chemical sciences ,Inorganic Chemistry ,Adsorption ,chemistry ,0210 nano-technology ,Porosity ,Topology (chemistry) - Abstract
The development of porous MOFs with novel structures and functional properties is a key research topic in the MOF chemistry and materials field. In this article, by employing a ligand conformation preorganization strategy, we designed a nonplanar methyl-substituted triisophthalate ligand, which was used to successfully construct a copper–hexacarboxylate framework with a novel topological structure. More importantly, the obtained MOF not only exhibits good hydrolytic stability but also shows utility as an adsorbent for efficient separation and purification of C2H2 and natural gas under ambient conditions. At ambient temperature and atmospheric pressure, the C2H2 and CO2 uptake capacities reach up to 149.1 and 83.1 cm3 (STP) g−1, while the IAST-predicted C2H2/CH4 (50/50, v/v), C2H2/CO2 (50/50, v/v), and CO2/CH4 (50/50, v/v) adsorption selectivities are as high as 22.2, 3.81, and 5.13.
- Published
- 2019
15. Weavable Transparent Conductive Fibers with Harsh Environment Tolerance
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Minghui He, Xiaochun Wang, Guangxue Chen, Ling Cai, and Ren'ai Li
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Flexibility (engineering) ,Textile ,Materials science ,business.industry ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,General Materials Science ,Electronics ,Fiber ,0210 nano-technology ,business ,Electrical conductor ,Wearable technology - Abstract
Fiber and textile electronics provide a focus for a new generation of wearable electronics due to their unique lightness and flexibility. However, fabricating knittable fibers from conductive materials with high tensile and transparent properties remains a challenge, especially for applicability in harsh environments. Here, we report a simple photopolymerization approach for the rapid preparation of a new type of a transparent conductive polymer fiber, poly(polymerizable deep eutectic solvent (PDES)) fiber, which exhibits excellent stability at high/low temperature, in organic solvents, especially in dry environments, and overcomes the volatility and freezability of traditional gel materials. A poly(PDES) fiber possesses outstanding mechanical and sensing properties, including negligible hysteresis and creep, fast resilience after a long stretch (10 min), and signal stability during high-frequency cyclic stretching (1 Hz, 10 000 cycles). In addition, the poly(PDES) fibers are knitted into a plain-structured sensor on textile with breathability and high tolerance to damage, enabling stable and accurate monitoring of human stretching, bending, and rotation motions. Furthermore, its dry-cleaning resistance guarantees the feasibility of long-term monitoring, with the electrical signal remaining stable after five dry-cleaning cycles. These promising features of poly(PDES) fibers will promote potential applications in the fields of human movement monitoring, intelligent fibers, and soft robotics.
- Published
- 2021
16. A flexible photo-thermoelectric nanogenerator based on MoS2/PU photothermal layer for infrared light harvesting
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Zhang Binbin, Yannan Xie, Zong-Hong Lin, Yu-Jhen Lin, Weifeng Yang, Minghui He, Daqin Yun, and Che-Min Chiu
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Materials science ,Renewable Energy, Sustainability and the Environment ,business.industry ,Photothermal effect ,Nanogenerator ,02 engineering and technology ,Photothermal therapy ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,PEDOT:PSS ,Thermoelectric effect ,Optoelectronics ,General Materials Science ,Electronics ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Energy harvesting ,Layer (electronics) - Abstract
Recently, ambient energy harvesting has attracted a great deal of attention to develop clean and renewable energy technologies. In this work, a flexible photo-thermoelectric nanogenerator (PTENG) based on MoS2/PU photothermal film and Te/PEDOT thermoelectric layer has been demonstrated for harvesting environmental infrared (IR) light. The MoS2/PU photothermal film is carefully designed to exhibit excellent flexibility, transferability, and photothermal property. By integrating the photothermal layer with a Te/PEDOT thermoelectric device, the PTENG can produce electrical output without a spatial temperature gradient which is necessary for conventional thermoelectric device. Under IR light illumination, a high temperature difference can be generated across the device, and hence a potential difference established between two electrodes based on a coupling of photothermal effect and Seebeck effect. This type of PTENG exhibits numerous advantages, such as flexible, shape-adaptive, light-weight, and simple-fabrication, which may have a great potential of application in photo-thermoelectric energy harvesting for wearable electronics and implantable electronics.
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- 2018
17. Exploring the Effect of Ligand-Originated MOF Isomerism and Methoxy Group Functionalization on Selective Acetylene/Methane and Carbon Dioxide/Methane Adsorption Properties in Two NbO-Type MOFs
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Xiaoxia Gao, Minghui He, Shunshun Xiong, Rajamani Krishna, Yabing He, Saidan Li, Yao Wang, and Chemical Reactor engineering (HIMS, FNWI)
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Materials science ,business.industry ,Ligand ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Methane ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,chemistry ,Chemical engineering ,Acetylene ,Natural gas ,Carbon dioxide ,Surface modification ,General Materials Science ,Metal-organic framework ,0210 nano-technology ,business - Abstract
Investigation of the impact of ligand-originated MOF (metal–organic framework) isomerism and ligand functionalization on gas adsorption is of vital importance because a study in this aspect provides valuable guidance for future fabrication of new MOFs exhibiting better performance. For the abovementioned purpose, two NbO-type ligand-originated MOF isomers based on methoxy-functionalized diisophthalate ligands were solvothermally constructed in this work. Their gas adsorption properties toward acetylene, carbon dioxide, and methane were systematically investigated, revealing their promising potential for the adsorptive separation of both acetylene/methane and carbon dioxide/methane gas mixtures, which are involved in the industrial processes of acetylene production and natural gas sweetening. In particular, compared to its isomer ZJNU-58, ZJNU-59 displays larger acetylene and carbon dioxide uptake capacities as well as higher acetylene/methane and carbon dioxide/methane adsorption selectivities despite its lower pore volume and surface area, demonstrating a very crucial role that the effect of pore size plays in acetylene and carbon dioxide adsorption. In addition, the impact of ligand modification with a methoxy group on gas adsorption was also evaluated. ZJNU-58 exhibits slightly lower acetylene and carbon dioxide uptake capacities but higher acetylene/methane and carbon dioxide/methane adsorption selectivities as compared to its parent compound NOTT-103. By contrast, enhanced adsorption selectivities and uptake capacities were observed for ZJNU-59 as compared to its parent compound ZJNU-73. The results demonstrated that the impact of ligand functionalization with a methoxy group on gas adsorption might vary from MOF to MOF, depending on the chosen parent compound. The results might shed some light on understanding the impact of both ligand-originated MOF isomerism and methoxy group functionalization on gas adsorption.
- Published
- 2018
18. Engineering Biocompatible Hydrogels from Bicomponent Natural Nanofibers for Anticancer Drug Delivery
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Congcan Shi, Ting Chen, Xu Junfei, Minghui He, Guangxue Chen, Shan Liu, Junfei Tian, Jing Wu, and Tao Song
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Drug ,media_common.quotation_subject ,Nanofibers ,Antineoplastic Agents ,Biocompatible Materials ,Chitin ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Cyclic N-Oxides ,chemistry.chemical_compound ,Drug Delivery Systems ,medicine ,Cellulose ,media_common ,Chemistry ,Biomaterial ,Hydrogels ,General Chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Cross-Linking Reagents ,Delayed-Action Preparations ,Nanofiber ,Drug delivery ,Self-healing hydrogels ,Fluorouracil ,Self-assembly ,Swelling ,medicine.symptom ,0210 nano-technology ,General Agricultural and Biological Sciences - Abstract
Natural hydrogels have attracted extensive research interest and shown great potential for many biomedical applications. In this study, a series of biocompatible hydrogels was reported based on the self-assembly of positively charged partially deacetylated α-chitin nanofibers (α-DECHN) and negatively charged 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibers (TOCNF) for anticancer drug delivery. The formation mechanisms of the α-DECHN/TOCNF hydrogels with different mixing proportions were studied, and their morphological, mechanical, and swelling properties were comprehensively investigated. Additionally, the drug delivery performance of the hydrogels was compared via sustained release test of an anticancer drug (5-fluorouracil). The results showed that the hydrogel with higher physical cross-linking degree exhibited a higher drug loading efficiency and drug release percentage.
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- 2018
19. Two NbO-type MOFs based on linear and zigzag diisophthalate ligands: exploring the effect of ligand-originated MOF isomerization on gas adsorption properties
- Author
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Yingying Zhang, Xia Wang, Piao Long, Yabing He, Yao Wang, Xiaoxia Gao, Minghui He, and Haoyan Zhong
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Materials science ,Ligand ,business.industry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Adsorption ,Acetylene ,chemistry ,Volume (thermodynamics) ,Zigzag ,Natural gas ,Physical chemistry ,0210 nano-technology ,business ,Isomerization ,Natural bond orbital - Abstract
NbO-type MOFs constructed from dicopper paddlewheel secondary building units and diisophthalate ligands not only exhibit great promise for the separation of environment and energy-related gas pairs but also more importantly provide an excellent platform for the fundamental investigation of structure–property relationships. In this work, two NbO-type MOFs (ZJNU-91 and ZJNU-92) derived from linear and zigzag-shaped thieno[3,2-b]thiophene-functionalized diisophthalate ligands were solvothermally prepared and structurally characterized. Their gas adsorption properties with respect to C2H2, CO2, and CH4 were systematically investigated, revealing that they exhibit promising potential for selective adsorptive separation of C2H2–CH4 and CO2–CH4 binary gas mixtures which are associated with acetylene production and natural gas upgrading. In particular, compared to its isomer ZJNU-92, ZJNU-91 displays larger C2H2 and CO2 uptake capacities as well as higher C2H2/CH4 and CO2/CH4 adsorption selectivities under ambient conditions, despite its lower surface area and pore volume. On the basis of structural analyses, the better performance of ZJNU-91 compared to its isomer ZJNU-92 can be ascribed to its more optimized pore size.
- Published
- 2018
20. Three isoreticular ssa-type MOFs derived from bent diisophthalate ligands: exploring the substituent effect on structural stabilities and selective C2H2/CH4 and CO2/CH4 adsorption properties
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Minghui He, Xiaoxia Gao, Xia Wang, Yabing He, Haoyan Zhong, Piao Long, Yao Wang, and Yingying Zhang
- Subjects
Materials science ,010405 organic chemistry ,Bent molecular geometry ,Rational design ,Substituent ,chemistry.chemical_element ,010402 general chemistry ,01 natural sciences ,Copper ,0104 chemical sciences ,Inorganic Chemistry ,Solvent ,chemistry.chemical_compound ,Adsorption ,chemistry ,Computational chemistry ,Porosity ,Topology (chemistry) - Abstract
Evaluating the effect of the substituents on structural stabilities and gas adsorption properties of MOFs is fundamentally important for rational design and synthesis of new MOFs with better performance. For this purpose, three isoreticular copper-based MOFs (ZJNU-87, ZJNU-88 and ZJNU-89) with ssa-type topology were successfully constructed from bent diisophthalate ligands bearing different substituents. Permanent porosity studies reveal that the substituent has a significant effect on framework stabilities against desolvation. Utilizing nonpolar n-hexane as an activation solvent can give more optimized permanent porosity for nonpolar or less-polar substituent-modified ZJNU-88 and ZJNU-89. Furthermore, their gas adsorption properties with respect to C2H2, CO2 and CH4 were systematically investigated, revealing their promising potential for selective C2H2/CH4 and CO2/CH4 separations. In particular, methoxy-modified ZJNU-89 performs better than the methyl-modified ZJNU-88 in terms of uptake capacity and adsorption selectivity, which might be attributed to more suitable pore space of ZJNU-89.
- Published
- 2018
21. Selective adsorption of C2H2 and CO2 from CH4 in an isoreticular series of MOFs constructed from unsymmetrical diisophthalate linkers and the effect of alkoxy group functionalization on gas adsorption
- Author
-
Yao Wang, Fengli Chen, Minghui He, Dongjie Bai, Xiaoxia Gao, and Yabing He
- Subjects
Renewable Energy, Sustainability and the Environment ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,Acetylene ,chemistry ,Selective adsorption ,Alkoxy group ,Organic chemistry ,Gravimetric analysis ,Surface modification ,General Materials Science ,0210 nano-technology ,Porous medium - Abstract
For acetylene production and natural gas purification, the development of porous materials exhibiting highly selective C2H2/CH4 and CO2/CH4 separations is very important but remains a major challenge. In this work, we employed three unsymmetrical diisophthalate ligands to construct an isoreticular series of copper-based MOFs exhibiting highly selective adsorption of C2H2 and CO2 from CH4 under ambient conditions. The gravimetric uptake capacities at 298 K and 1 atm vary from 171.7 to 200.4 cm3 (STP) per g for C2H2, and from 104.1 to 115.6 cm3 (STP) per g for CO2. The IAST adsorption selectivity is in the range of 27.6–34.5 for an equimolar C2H2/CH4 mixture, and 5.73–7.14 for an equimolar CO2/CH4 mixture at 298 K and 1 atm. These values are among the highest reported for MOFs constructed from bent diisophthalate ligands under the same conditions. The effect of alkoxy group functionalization on gas adsorption was also explored, revealing that compared to the parent compound, the alkoxy group functionalized MOFs exhibit a reduced uptake capacity but an improved adsorption selectivity. This work demonstrates that the three MOFs are promising materials for C2H2/CH4 and CO2/CH4 separations, and provides a fundamental understanding of alkoxy group functionalization on gas adsorption properties.
- Published
- 2018
22. Three isoreticular MOFs derived from nitrogen-functionalized diisophthalate ligands: exploring the positional effect of nitrogen functional sites on the structural stabilities and selective C2H2/CH4 and CO2/CH4 adsorption properties
- Author
-
Minghui He, Yao Wang, Xiaoxia Gao, Dongjie Bai, and Yabing He
- Subjects
Rational design ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Nitrogen ,0104 chemical sciences ,Inorganic Chemistry ,Solvent ,Adsorption ,chemistry ,Computational chemistry ,Molecule ,Desolvation ,0210 nano-technology - Abstract
Understanding the structure–property relationship is conducive to the rational design and synthesis of porous MOFs with better performance. In this work, we constructed three isoreticular MOFs derived from quinoline-functionalized bent diisophthalate ligands as a platform to investigate the positional effect of nitrogen functional sites on the structural stabilities and gas adsorption properties of the resulting MOFs. N2 adsorption experiments performed at 77 K revealed that the three MOF compounds exhibited different stabilities against the framework desolvation, which we think is attributed to different accessibility degrees of nitrogen functional sites leading to different interactions between the frameworks and activated solvent molecules. In addition, as a consequence of the incorporation of nitrogen functional sites into the framework, the most stable MOF ZJNU-84 outperformed its parent compound ZJNU-71 in terms of C2H2 and CO2 uptake capacities and C2H2/CH4 and CO2/CH4 adsorption selectivities, indicating its promising potential for the selective separation of C2H2 and CO2 from CH4. However, the enhancement is not as remarkable as expected due to a low degree of accessibility of nitrogen functional sites in the framework.
- Published
- 2018
23. Controllable manipulation of bubbles in water by using underwater superaerophobic graphene-oxide/gold-nanoparticle composite surfaces
- Author
-
Xiangyang Xu, Bin Su, Minghui He, and Ruixin Xu
- Subjects
Fabrication ,Materials science ,Graphene ,Bubble ,Microfluidics ,Oxide ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Boiling ,General Materials Science ,Underwater ,0210 nano-technology - Abstract
Manipulation of bubbles in water is of great importance in the mineral industry, oil production and separation, wastewater treatments, boiling processes, biological cell incubations, microfluidics and miniature reactor technologies. Generally, bubbles in an aqueous environment are inclined to stick to the channel walls, resulting in blockage and energy-consuming treatments. Herein, we report the fabrication of low-adhesion graphene-oxide (GO)/gold-nanoparticle (GNP) hybrid films with a good underwater superaerophobicity, which have the ability to arbitrarily manipulate bubbles in water. Owing to the hydrophilic nature of GO nanosheets and hierarchical structures of aggregated GNPs, the GO/GNP hybrid films showed low adhesion towards bubbles in water. Thus, bubbles could be freely manipulated using home-made tools coated with these low-adhesion, underwater superaerophobic GO/GNP hybrid films. The controlled 1D and 2D movements of one bubble and merging/reaction of two bubbles can be achieved. This study provides a new avenue to design new strategies for bubble manipulations, and further extends the application of superwettable 2D materials in interface fields involving gas phases.
- Published
- 2018
24. Three ligand-originated MOF isomers: the positional effect of the methyl group on structures and selective C2H2/CH4 and CO2/CH4 adsorption properties
- Author
-
Xiaoxia Gao, Minghui He, Saidan Li, Yao Wang, and Yabing He
- Subjects
Steric effects ,Ligand ,fungi ,Gas uptake ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Adsorption ,chemistry ,Computational chemistry ,0210 nano-technology ,Methyl group - Abstract
Three copper-based ligand-originated MOF isomers (ZJNU-81, ZJNU-82 and ZJNU-83) derived from methyl-functionalized V-shaped diisophthalate ligands were solvothermally synthesized and structurally characterized. Single-crystal X-ray diffraction studies revealed that the position of the methyl group in the central phenyl spacer of diisophthalate ligands exerted a significant effect on determining the final structures of the resulting MOFs, which was rationalized to result from the steric effect imposed by the methyl group controlling the conformational structures of the ligands during the self-assembly process. Furthermore, their gas adsorption properties with respect to C2H2, CO2, and CH4 were systematically investigated and comparatively analyzed. Gratifyingly, the three MOFs exhibited respectable C2H2 and CO2 uptake capacities as well as impressive C2H2/CH4 and CO2/CH4 adsorption selectivities. Although the disparity is small, the different gas uptake capacities and adsorption selectivities exhibited by the three MOFs demonstrate that the position of the methyl group has a certain impact on gas adsorption properties. This work not only reported three MOFs with promising potential for C2H2/CH4 and CO2/CH4 separations, but also more importantly afforded a fundamental understanding of the positional effect of functional groups on the structures and gas adsorption properties of the resulting MOFs, which provides valuable guidance for future design and synthesis of porous MOFs displaying better performance.
- Published
- 2018
25. A pair of polymorphous metal–organic frameworks based on an angular diisophthalate linker: synthesis, characterization and gas adsorption properties
- Author
-
Dongjie Bai, Yao Wang, Minghui He, Fengli Chen, Yabing He, and Xiaoxia Gao
- Subjects
Diffraction ,Chemistry ,Space group ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,0104 chemical sciences ,Ion ,Inorganic Chemistry ,Adsorption ,Polymorphism (materials science) ,Organic chemistry ,Physical chemistry ,Metal-organic framework ,0210 nano-technology ,Linker - Abstract
The combination of an angular diisophthalate ligand, 5,5′-(naphthyl-2,7-yl)diisophthalate (H4L), and copper ions under different solvothermal conditions afforded two polymorphous metal–organic frameworks (ZJNU-77 and ZJNU-78) with the same framework composition of [Cu2(L)(H2O)2], providing a platform to investigate the relationship between MOF polymorphism and gas adsorption properties. As determined by single-crystal X-ray diffraction, ZJNU-77 and ZJNU-78 exhibited three-dimensional networks crystallizing in different space groups. Their structural differences were mainly manifested by the ligand's conformation, the level of framework interpenetration and the network's topology. Interestingly, gas adsorption studies showed that the two compounds after desolvation displayed comparable gas adsorption properties with respect to C2H2, CO2 and CH4, despite their different surface areas and pore volumes. The C2H2, CO2, and CH4 uptake capacities at 298 K and 1 atm are 120.2, 78.1, and 18.4 cm3 (STP) g−1 for ZJNU-77, and 122.0, 82.0, and 18.9 cm3 (STP) g−1 for ZJNU-78, respectively. The IAST adsorption selectivities for the equimolar C2H2/CH4 and CO2/CH4 mixtures are 28.6 and 5.7 for ZJNU-77, and 28.4 and 5.9 for ZJNU-78 at 298 K and 1 atm. These results indicate that besides the surface area, the pore size also plays a crucial role in gas adsorption. This work not only represents an intriguing example of MOF polymorphism achieved by controlling solvothermal conditions, but also provides an insight into the correlation between MOF polymorphism and gas adsorption properties.
- Published
- 2018
26. Green polymerizable deep eutectic solvent (PDES) type conductive paper for origami 3D circuits
- Author
-
Li Ren'ai, Fachuang Lu, Bin Su, Minghui He, Guangxue Chen, Kaili Zhang, and Junfei Tian
- Subjects
Fabrication ,Materials science ,Metals and Alloys ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Deep eutectic solvent ,chemistry.chemical_compound ,chemistry ,Screen printing ,Materials Chemistry ,Ceramics and Composites ,Electronics ,In situ polymerization ,0210 nano-technology ,Electrical conductor ,Eutectic system ,Electronic circuit - Abstract
We report a green fabrication of conductive paper based on in situ polymerization of polymerizable deep eutectic solvents (PDESs) through a screen printing process. By pre-designed circuit paths and careful integration, on-demand input/output 3D circuits can be achieved, showing its flexibility to origami electronics.
- Published
- 2018
27. A metal–organic framework based on a custom-designed diisophthalate ligand exhibiting excellent hydrostability and highly selective adsorption of C2H2 and CO2 over CH4
- Author
-
Minghui He, Xiaoxia Gao, Yabing He, Saidan Li, and Yao Wang
- Subjects
Materials science ,010405 organic chemistry ,Ligand ,chemistry.chemical_element ,010402 general chemistry ,Highly selective ,01 natural sciences ,Combinatorial chemistry ,Copper ,0104 chemical sciences ,Adsorption selectivity ,Inorganic Chemistry ,Adsorption ,chemistry ,Chemical stability ,Fourier transform infrared spectroscopy ,Powder diffraction - Abstract
The ligand truncation strategy provides facile access to a wide variety of linkers for the construction of MOFs bearing diverse structures and intriguing properties. In this work, we employed this strategy to design and prepare a novel bent diisophthalate ligand, and used it to successfully construct a copper-based MOF ZJNU-51 with the formula of [Cu2L(H2O)2]·5DMF (H4L = 5,5'-(triphenylamine-4,4'-diyl) diisophthalic acid), which was thoroughly characterized by various techniques including FTIR, TGA, PXRD and single-crystal X-ray diffraction. ZJNU-51 is a two-fold interpenetrated network in which the single network consists of dicopper paddlewheel units connected by the organic ligands and contains open channels as well as six distinct types of metal-organic cages. Furthermore, gas adsorption properties with respect to C2H2, CO2, and CH4 were systematically investigated, demonstrating that ZJNU-51 is a highly promising material for C2H2/CH4 and CO2/CH4 separations. Specifically, the IAST adsorption selectivity at 298 K and 1 atm reaches 35.6 and 5.4 for the equimolar C2H2/CH4 and CO2/CH4 gas mixtures, respectively. More significantly, as revealed by PXRD and N2 adsorption measurements, ZJNU-51 exhibits excellent chemical stability, which lays a good foundation for its practical application.
- Published
- 2018
28. Structural diversities and gas adsorption properties of a family of rod-packing lanthanide–organic frameworks based on cyclotriphosphazene-functionalized hexacarboxylate derivatives
- Author
-
Dongjie Bai, Yabing He, Minghui He, Xiaoxia Gao, and Yao Wang
- Subjects
Lanthanide ,Hexacarboxylate ,business.industry ,Chemistry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,Adsorption ,Natural gas ,Desorption ,Polymer chemistry ,0210 nano-technology ,business ,Porosity - Abstract
Solvothermal reactions of cyclotriphosphazene-functionalized hexacarboxylate derivatives bearing different substituents (methoxy, chloro, bromo and methyl) with Ho(NO3)3·6H2O gave rise to four new three-dimensional lanthanide metal–organic frameworks (Ln-MOFs). Single-crystal X-ray diffraction analyses reveal that they all feature rod-shaped Ho-carboxylate chains as inorganic secondary building units but display substituent-driven structural diversities instead of the isoreticular structures. N2 adsorption and desorption studies show that among these Ln-MOFs, only the methoxy-modified Ln-MOF ZJNU-63 after activation exhibits permanent porosity. Furthermore, the gas adsorption properties of ZJNU-63 with respect to C2H2, C2H4, C2H6, CO2, and CH4 were systematically investigated, revealing its possible potential for natural gas purification. Although the separation performance is not very impressive compared to the other reported MOFs, ZJNU-63 presents a rare example of permanently porous Ln-MOFs constructed from flexible organic ligands displaying selective gas adsorption. Besides, ZJNU-63 can adsorb a large amount of C4 hydrocarbons with uptake capacities ranging from 58.8 to 75.7 cm3 (STP) g−1 at 298 K and 1 atm.
- Published
- 2018
29. Formation of self-limited, stable and conductive interfaces between garnet electrolytes and lithium anodes for reversible lithium cycling in solid-state batteries
- Author
-
Zhonghui Cui, Yiqiu Li, Xiangxin Guo, Minghui He, and Cheng Chen
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Alloy ,Solid-state ,02 engineering and technology ,General Chemistry ,Electrolyte ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Anode ,Chemical engineering ,engineering ,Energy density ,General Materials Science ,Effective surface ,Thin film ,0210 nano-technology ,Electrical conductor - Abstract
Solid-state batteries (SSBs) have already attracted significant attention due to their potential to offer high energy density and excellent safety as compared to the currently used lithium-ion batteries with liquid electrolytes. The use of a lithium anode in SSBs is extremely important to realize these advantages. Starting from the synthesis of a highly conductive cubic garnet solid electrolyte (Li6.375La3Zr1.375Nb0.625O12, LLZNO) using Nb as a structure stabilizer, in this study, we demonstrated the resolution of interfacial problems between the garnet electrolyte and lithium anode and the integration of the lithium anode into garnet-based SSBs by modifying the as-synthesized LLZNO with a Sn thin film. Due to the Sn modification, the interfacial resistances between the garnet electrolyte and the lithium anode decreased approximately 20 times to only 46.6 Ω cm2. The fast and reversible lithium plating/stripping under high current densities and the excellent battery performance of Li/Sn-LLZNO/LiFePO4 full cells were achieved. This improvement is ascribed to the formation of a Li–Sn alloy interlayer, which severs as a self-limited stable and conductive interface, bridging the garnet electrolyte and the lithium anode and enabling fast and stable lithium transport. As a proof-of-concept, this effective surface modification method will offer inspirations to researchers for overcoming the interfacial problems and promoting the development of high-performance SSBs.
- Published
- 2018
30. Graphene-assisted construction of electrocatalysts for carbon dioxide reduction
- Author
-
Yugang Huang, Hong Zhao, Yinlei Lin, Yuyuan Zhang, Huawen Hu, Dongchu Chen, Jian Zhen Ou, Minghui He, Xuejun Xu, and Lifang Deng
- Subjects
Materials science ,Graphene ,General Chemical Engineering ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Redox ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,law.invention ,Catalysis ,Reaction rate ,chemistry ,law ,Specific surface area ,Environmental Chemistry ,0210 nano-technology ,Carbon ,Electrochemical reduction of carbon dioxide - Abstract
The electrochemical conversion of the greenhouse gas, carbon dioxide (CO2), to energy fuels and value-added chemicals presents one of the most valuable approaches to harvest pollutants and produce renewable energy. However, the stable molecular structure of CO2 and the sluggish reaction kinetics make CO2 reduction reaction (CO2RR) formidably challenging to achieve reaction rate and selectivity practical in industry. Graphene and its derivatives have been considered a group of intriguing materials to develop advanced CO2RR electrocatalysts due to their large specific surface area, remarkable electron transfer ability, superior stability, and easy tunability of the structure and surface properties. Herein, we comprehensively discuss the state-of-the-art electrocatalysts constructed with graphene and derivatives for active and selective CO2RR within the recent five years, mainly including the electrocatalysts with both metal-based (e.g., noble, non-noble, or combined thereof) and non-metal (e.g., doped, modified, defected, or composited) catalytic sites. To present the versatile, high-performance metal-based CO2RR electrocatalysts constructed with graphene, we further subdivide them according to the sizes, oxidation states, metal species synergies, dimensionalities, and versatility. Finally, we provide the challenges and perspectives in this emerging area of utilising CO2 to produce various carbon-based fuels and chemicals via graphene chemistry.
- Published
- 2021
31. 3D printing of ultra-tough, self-healing transparent conductive elastomeric sensors
- Author
-
Guangxue Chen, Minghui He, Bin Su, and Ling Cai
- Subjects
Materials science ,business.industry ,General Chemical Engineering ,Soft robotics ,3D printing ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Elastomer ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,chemistry.chemical_compound ,Photopolymer ,Polymerization ,chemistry ,Self-healing ,Environmental Chemistry ,Electronics ,0210 nano-technology ,business ,Choline chloride - Abstract
Ultra-tough transparent conductive elastomers (TCEs) with self-healing performance are of great significance for research in the fields of soft robotics, optical display electronics, wearable electronic equipment and human–computer interaction. However, their limitation, such as the desolventizing process, low polymerization rate or balance between toughness and self-healing performance, cause difficulty in manufacturing by the 3D printing technique. Here, we propose a novel preparation strategy for 3D printed TCEs based on the photopolymerization of maleic acid (MA)/choline chloride (ChCl) and acrylamide (AAm)/choline chloride type polymerizable deep eutectic solvents (PDESs). PDES can polymerize into a tough and rich in hydrogen bonds poly(PDES) in a few seconds without solvent evaporation. The printed TCEs with precision of 10 µm have high transparency (95.6%) and stable electrical signals at 50% compression for 10,000 cycles. In addition, efficient self-healing performance due to the dynamic hydrogen bonds of poly(PDES) provides broad application prospects for 3D printed TCEs in long-term pressure-resistant intelligent applications.
- Published
- 2021
32. Sustainable and superhydrophobic spent coffee ground-derived holocellulose nanofibers foam for continuous oil/water separation
- Author
-
Shenghong Sun, Minghui He, Huifang Chan, Yiyu Chen, Guangxue Chen, Congcan Shi, Junfei Tian, Zhaohui Yu, and Sheng Li
- Subjects
Materials science ,Aqueous solution ,Renewable Energy, Sustainability and the Environment ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,chemistry.chemical_compound ,Acetic acid ,Coffee grounds ,chemistry ,Chemical engineering ,Nanofiber ,General Materials Science ,Hemicellulose ,Oil water ,Cellulose ,0210 nano-technology ,Suspension (vehicle) ,Waste Management and Disposal - Abstract
Spent coffee ground (SCG), left over in coffee making, is the most abundant coffee byproduct, of which approximately 70% is made by cellulose and hemicellulose. Herein, we obtained a delignified SCG (D-SCG) by using an aqueous solution of 3 wt% NaOH for 1 h at 90 °C and then an aqueous solution of 3 wt% NaClO2 buffered with acetic acid at pH 4.3 for 2 h at 90 °C, respectively. Next, we used the D-SCG to fabricate holocellulose nanofibers (HCNF) suspension by TEMPO-Mediated oxidation. Finally, HCNF suspension was manufactured into superhydrophobic foams for oil-water separation through freeze-drying and hydrophobic modification. The superhydrophobic foams showed good properties of oil absorption capacity (16 g/g), separation efficiency (98.5%) and continuous separation. This work presents a novel idea for the further application of SCG and provides an eco-friendly and sustainable oil absorbent material to solve oil spill.
- Published
- 2021
33. Phototriggered base proliferation: a powerful 365 nm LED photoclick tool for nucleophile-initiated thiol-Michael addition reaction
- Author
-
Xiaoyuan Guan, Minghui He, Ruixin Xu, and Jianwen Yang
- Subjects
chemistry.chemical_classification ,Addition reaction ,Base (chemistry) ,General Chemical Engineering ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Reaction rate ,chemistry ,Photosensitivity ,Nucleophile ,Michael reaction ,Thiol ,Amine gas treating ,0210 nano-technology - Abstract
Photocaged amines (PCAs) can allow a spatiotemporal control of the highly versatile and widely implemented nucleophile-catalyzed thiol-Michael addition reaction. However, a major challenge with most PCAs is that their relatively low quantum yields easily lead to low photosensitivity, especially under the radiation of light-emitting diodes (LEDs). In this paper, the phototriggered base proliferation (PBP) reaction as a powerful 365 nm LED photoclick tool is presented for the nucleophile-initiated thiol-Michael addition reaction. Compared to the PCA system, the advantages of this approach lie in its enhanced photosensitivity, increased reaction rate and elevated conversion. Finally, due to the persistent interactions of the produced longeval amine, remarkable post conversion was thus initially achieved after irradiation.
- Published
- 2017
34. Patternable transparent and conductive elastomers towards flexible tactile/strain sensors
- Author
-
Junfei Tian, Ren'ai Li, Guangxue Chen, Bin Su, and Minghui He
- Subjects
Materials science ,Fabrication ,Stretchable electronics ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Transparency (human–computer interaction) ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Elastomer ,01 natural sciences ,Flexible electronics ,0104 chemical sciences ,Photopolymer ,Materials Chemistry ,Transmittance ,0210 nano-technology ,Electrical conductor - Abstract
Transparent conductive elastomers are an emerging platform for stretchable electronics, attractive due to their ability to sustain high physical deformations while still fulfilling optical/electrical functions. Poly(deep eutectic solvent)s (DESs) can serve as a new type of transparent conductive elastomers as a result of their low cost, green fabrication, non-toxicity and post-treatment-free advantages. Here, we report a 3D patternable (starfish type), transparent (transmittance of ∼81%), stretchable (strain up to 150%), and conductive (∼0.2 S m−1) elastomer based on the photopolymerization of the acrylic-acid/choline-chloride DES. The combination of transparency, elasticity, conductivity and patternability allows the poly(DES) elastomers to serve as flexible tactile/strain sensors. Our methodology has the potential to exploit the new application of poly(DESs), and opens up a new powerful route to fabricate all-organic transparent, conductive elastomers for a myriad of applications in future flexible electronics.
- Published
- 2017
35. Highly Stretchable, Transparent, and Conductive Wood Fabricated by in Situ Photopolymerization with Polymerizable Deep Eutectic Solvents
- Author
-
Haisong Qi, Guixian Chen, Shenghui Zhou, Xiao Feng, Ren'ai Li, Minghui He, Tao Song, Ming Wang, Yian Chen, and Detao Liu
- Subjects
Conductive polymer ,Materials science ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Environmentally friendly ,0104 chemical sciences ,Deep eutectic solvent ,chemistry.chemical_compound ,chemistry ,Flexible display ,Transmittance ,General Materials Science ,0210 nano-technology ,Porosity ,Electrical conductor ,Eutectic system - Abstract
The rational design of high-performance, flexible, transparent, electrically conducting sensor attracts considerable attention. However, these designed devices predominantly utilize glass and plastic substrates, which are expensive and not environmentally friendly. Here, novel transparent and conductive woods (TCWs) were fabricated by using renewable wood substrates and low-cost conductive polymers. Polymerizable deep eutectic solvents (PDES), acrylic-acid (AA)/choline chloride (ChCl), were used as backfilling agents and in situ photopolymerized in the delignified wood, which endowed the materials with high transparency (transmittance of 90%), good stretchability (strain up to 80%), and high electrical conductivity (0.16 S m-1). The retained cellulose orientation and strong interactions between the cellulose-rich template and poly(PDES) endow TCWs with excellent mechanical properties. Moreover, TCWs exhibited excellent sensing behaviors to strain/touch, even at low strain. Therefore, these materials can be used to detect weak pressure such as human being's subtle bending-release activities. This work provides a new route to fabricate functional composite materials and devices which have promising potential for electronics applications in flexible displays, tactile skin sensors, and other fields.
- Published
- 2019
36. Cobalt-Catalyzed Monoselective Ortho-C–H Functionalization of Carboxamides with Organoaluminum Reagent
- Author
-
Minghui He, Zhiqiang Wang, Sheng Zhang, Huiqiao Wang, and Kun Xu
- Subjects
inorganic chemicals ,chemistry.chemical_classification ,010405 organic chemistry ,Organic Chemistry ,chemistry.chemical_element ,Methylation ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Chloride ,0104 chemical sciences ,Catalysis ,Cobalt catalyst ,chemistry ,Reagent ,medicine ,Organic chemistry ,Surface modification ,Physical and Theoretical Chemistry ,Cobalt ,Alkyl ,medicine.drug - Abstract
A simple triphenylphosphine-ligated cobalt catalyst is reported for the direct ortho-C-H methylation and ethylation of aromatic, heteroaromatic, alkenyl, and even aliphatic carboxamides with inexpensive organoaluminum reagents in the presence of a cheap alkyl chloride as oxidant. This reaction shows monoselectivity in contrast with previously established C-H methylation methodologies.
- Published
- 2016
37. Synthesis and characterization of UV-curable castor oil-based polyfunctional polyurethane acrylate via photo-click chemistry and isocyanate polyurethane reaction
- Author
-
Guangxue Chen, Ruixin Xu, Xiaoyuan Guan, Minghui He, Wei Shen, Jianwen Yang, and Junfei Tian
- Subjects
Materials science ,General Chemical Engineering ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,Polyol ,Polymer chemistry ,Materials Chemistry ,medicine ,Organic chemistry ,Curing (chemistry) ,Polyurethane ,chemistry.chemical_classification ,Acrylate ,Organic Chemistry ,021001 nanoscience & nanotechnology ,Isocyanate ,0104 chemical sciences ,Surfaces, Coatings and Films ,chemistry ,Castor oil ,Click chemistry ,Isophorone diisocyanate ,0210 nano-technology ,medicine.drug - Abstract
In this paper, UV-curable castor oil-based polyfunctional polyurethane acrylate (COME-PUA) was synthesized via photo-click chemistry and isocyanate polyurethane reaction. Facile and highly efficient side-chain functionalization of castor oil (CO) was first achieved via thiol-ene photo-click chemistry with β-mercaptoethanol (ME). 1 H NMR result indicated that almost 100% conversion of double-bond in CO was observed within 10 min, and the average hydroxyl functionality of the obtained polyol COME was about 6. Next, COME was modified by isocyanate polyurethane reaction with hydroxypropyl acrylate (HPA), isophorone diisocyanate (IPDI) and PEG-200 as the chain extender in order to prepare the resin COME-PUA. Results of both 1 H NMR and FTIR revealed that the targeted COME and COME-PUA were successfully synthesized. Furthermore, UV-curing kinetic of COME-PUA was revealed by real-time FTIR, showing a higher UV-curing rate than the common CO-PUA. Finally, some physical properties of curing films were studied.
- Published
- 2016
38. Highly transparent, self-healing conductive elastomers enabled by synergistic hydrogen bonding interactions
- Author
-
Guangxue Chen, Minghui He, Hujun Xie, Ren'ai Li, Ting Fan, and Bin Su
- Subjects
Fabrication ,Materials science ,Hydrogen bond ,General Chemical Engineering ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Elastomer ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,Deep eutectic solvent ,chemistry.chemical_compound ,chemistry ,Self-healing ,Transmittance ,Environmental Chemistry ,Ionic conductivity ,Molecule ,0210 nano-technology - Abstract
It is attractive, though it is very challenging, to synthesize conductive elastomers with high transparency and self-healing ability, simultaneously with facile and environmentally friendly preparation process. Here we demonstrate the fabrication of highly transparent, self-healing conductive elastomers based on synergistic hydrogen bonding interactions between poly(polymerizable deep eutectic solvent) (poly(PDES)) and phytic acid (PA) molecules. The hybrid network elastomers showed a fast self-healing property (within 2 s) without any other external stimuli and excellent self-healing efficiency (91.5%) within 48 h. The poly(PDES)-PA elastomers were highly transparent (an average transmittance of 93%), intrinsically conductive (an ionic conductivity of 7.8 × 10−4 S cm−1) and stretchable (strains up to 1300%). Furthermore, the abilities of healable & conductive poly(PDES)-PA elastomers to monitor the human activities retained no matter before or after being damaged. We believe this kind of dynamic bond manipulation is a powerful strategy to design and synthesize various transparent, self-healing, conductive elastomers for versatile applications.
- Published
- 2020
39. Interfacial integration and roll forming of quasi-solid-state Li–O2 battery through solidification and gelation of ionic liquid
- Author
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Zhonghui Cui, Minghui He, Yiqiu Li, Ya Mao, Tao Zhang, Hao-Ran Wang, and Kang-Ning Gao
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,02 engineering and technology ,Electrolyte ,Carbon nanotube ,Overpotential ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Ionic liquid ,Fast ion conductor ,Ionic conductivity ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Quasi-solid ,Electrochemical window - Abstract
The development of solid-state lithium-oxygen batteries is currently limited primarily by the high solid-solid interfacial resistance and the lack of efficient assembly of electrolyte and electrode. In this work, noncovalent interactions between the cations of an ammonium ionic liquid and both solid electrolytes and carbon air cathodes are introduced. The ionic liquid-based electrolytes (ILE) are solidified on Li6·40La3Zr1·40Ta0·60O12 (LLZTO) nanoparticles and gelated by multi-wall carbon nanotubes (MWCNTs), respectively, to construct LLZTO@ILE quasi-solid-state electrolyte (QSSE) and MWCNTs-LLZTO/ILE gel cathode (GC). The QSSE exhibits a high ionic conductivity of 1.71 × 10−3 S cm−1 at 60 °C, high Li-ion transference number of 0.56, broad electrochemical window of ~4.8 V and good thermal stability. The GC shows outstanding compatibility with QSSE. Quasi-solid-state Li–O2 batteries are assembled by integrating QSSE and GC films with a facile roll forming method, showing a low total interfacial resistance (~87 Ω cm2), and excellent reversible cycles (70 cycles) with low charge overpotential ( 70%) at 60 °C and 200 mA g−1. A 0.12 Ah pouch-type Li–O2 battery was achieved by this method. These results suggest that the noncovalent interactions initiated by IL cations could be an effective approach to solve the solid-solid interface issue and achieve high discharge capacity in solid-state energy storage devices.
- Published
- 2020
40. Nanochitin/metal ion dual reinforcement in synthetic polyacrylamide network-based nanocomposite hydrogels
- Author
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Junfei Tian, Miaosi Li, Rong Cao, Guangxue Chen, Huichang Gao, Minghui He, Li Dongjian, and Liyun Guan
- Subjects
chemistry.chemical_classification ,Bioelectronics ,Materials science ,Nanocomposite ,Polymers and Plastics ,Organic Chemistry ,Polyacrylamide ,02 engineering and technology ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,Nanocellulose ,chemistry.chemical_compound ,Compressive strength ,chemistry ,Magazine ,Chemical engineering ,law ,Ultimate tensile strength ,Materials Chemistry ,0210 nano-technology - Abstract
Nanocomposite hydrogels consisting of a synthetic matrix reinforced by nanosized crystalline polysaccharides offer significant potential in various fields. Different from nanocellulose, the combination of nanochitin with synthetic polymers to obtain nanocomposite hydrogels has not been extensively and systematically studied. Herein, a physically and chemically dual crosslinked nanocomposite hydrogel was successfully synthesized, where chitin nanowhiskers (ChNWs) and Zn2+ were incorporated within polyacrylamide (PAAm) matrix. Nanochitin/metal ion dual reinforcement imparts increased elasticity, enhanced mechanical properties, and improved recovery performance to PAAm network. The PAAm/ChNWs/Zn2+ hydrogel could be stretched to over 13 times its original length with tensile strength of 321.9 ± 8.2 kPa, and restore its original shape rapidly even when compressed at a strain of 95% with a corresponding compressive strength of 6.95 ± 0.20 MPa. The multiple crosslinks and interactions among ChNWs, Zn2+ and synthetic polymeric network were investigated. Moreover, the hydrogel was applied in drug release and soft bioelectronics.
- Published
- 2020
41. Highly transparent, weakly hydrophilic and biodegradable cellulose film for flexible electroluminescent devices
- Author
-
Guangxue Chen, Ruiping Tong, Junfei Tian, and Minghui He
- Subjects
Luminescence ,Fabrication ,Materials science ,Polymers and Plastics ,Nanotechnology ,02 engineering and technology ,Substrate (electronics) ,Electroluminescence ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,Tensile Strength ,Ultimate tensile strength ,Materials Chemistry ,Cellulose ,Organic Chemistry ,Biodegradation ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Transparency (projection) ,chemistry ,Degradation (geology) ,Electronics ,0210 nano-technology ,Hydrophobic and Hydrophilic Interactions - Abstract
Developing green substrates based on cellulose to substitute synthetic plastics meet the requirement for the sustainable future. However, cellulose-based substrates supporting for building electronic devices are usually opaque and highly hydrophilic, which ultimately limits the performance of optoelectronic devices. Herein, we report a new avenue for fabrication of highly transparent, weakly hydrophilic and biodegradable cellulose film. The acquired cellulose film not only has high transparency (over 90%), but also displays weak hydrophilicity (∼79° of initial water-contact angle) and still remains 3.5 MPa of tensile strength after soaking for two days in deionized water. Additionally, the degradation half-life of cellulose film is 20 days, and the cellulose films also have better thermostability. Moreover, the flexible electroluminescent devices have been successfully constructed by using this cellulose film as a green substrate. This novel strategy will greatly enrich the applications of cellulose films for next generation green electronics.
- Published
- 2020
42. Fabrication of transparent and superhydrophobic nanopaper via coating hybrid SiO2/MWCNTs composite
- Author
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Xu Junfei, Junfei Tian, Guangxue Chen, Shi Congcan, Zhenhua Wu, Li Dongjian, Qiqi Wu, and Minghui He
- Subjects
Fabrication ,Materials science ,Polymers and Plastics ,Organic Chemistry ,Composite number ,Nanotechnology ,02 engineering and technology ,Carbon nanotube ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Flexible electronics ,0104 chemical sciences ,law.invention ,Contact angle ,Coating ,law ,Nanofiber ,Materials Chemistry ,engineering ,0210 nano-technology ,Sheet resistance - Abstract
Nanopaper prepared from cellulose nanofibers (CNFs) is a kind of promising substrate for various high-tech devices. However, several drawbacks including poor water stability and weak corrosion resistance still remain, which limit the practical applications of the nanopaper. Herein, we present a simple and low-cost method for fabricating transparent and superhydrophobic nanopaper by spraying fluorinated silica/multi-walled carbon nanotubes (SiO2/MWCNTs) composite on the nanopaper. A series of functional nanopaper were fabricated, which shows excellent performance of water repellency, chemical stability, conductivity, thermostability and self-cleaning property. Among them, the nanopaper modified with the composite containing 0.5 wt% MWCNTs has a water contact angle of about 163°, transparency of 79.96% and the sheet resistance of 3.15 × 106 Ω sq−1. The combination of the promising features in a material offers attractive prospects, and enables our nanopaper could be tailored for emerging applications such as flexible electronics, display protection and intelligent packages.
- Published
- 2019
43. Stretchable and Wearable Triboelectric Nanogenerator Based on Kinesio Tape for Self-Powered Human Motion Sensing
- Author
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Yannan Xie, Lihui Gan, Ning Li, Minghui He, Yingru Zhao, Shutang Wang, and Bingjuan Weng
- Subjects
energy harvesting ,Computer science ,General Chemical Engineering ,Wearable computer ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Article ,lcsh:Chemistry ,self-power active sensor ,General Materials Science ,Wearable technology ,Triboelectric effect ,business.industry ,triboelectric nanogenerator ,Nanogenerator ,Electrical engineering ,Conformable matrix ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,biomechanical sensing ,lcsh:QD1-999 ,Interfacing ,0210 nano-technology ,business ,flexible and wearable electronics ,Energy harvesting ,Voltage - Abstract
Recently, wearable, self-powered, active human motion sensors have attracted a great deal of attention for biomechanics, physiology, kinesiology, and entertainment. Although some progress has been achieved, new types of stretchable and wearable devices are urgently required to promote the practical application. In this article, targeted at self-powered active human motion sensing, a stretchable, flexible, and wearable triboelectric nanogenerator based on kinesio tapes (KT-TENG) haven been designed and investigated systematically. The device can effectively work during stretching or bending. Both the short-circuit transferred charge and open-circuit voltage exhibit an excellent linear relationship with the stretched displacements and bending angles, enabling its application as a wearable self-powered sensor for real-time human motion monitoring, like knee joint bending and human gestures. Moreover, the KT-TENG shows good stability and durability for long-term operation. Compared with the previous works, the KT-TENG without a macro-scale air gap inside, or stretchable triboelectric layers, possesses various advantages, such as simple fabrication, compact structure, superior flexibility and stability, excellent conformable contact with skin, and wide-range selection of triboelectric materials. This work provides a new prospect for a wearable, self-powered, active human motion sensor and has numerous potential applications in the fields of healthcare monitoring, human-machine interfacing, and prosthesis developing.
- Published
- 2018
44. Construction of conductive and flexible composite cathodes for room-temperature solid-state lithium batteries
- Author
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Feng Han, Zhonghui Cui, Minghui He, and Xiangxin Guo
- Subjects
Materials science ,Ionic bonding ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,Solid-state battery Flexible composite cathodes Stable interface Cycle stability and rate capability ,010402 general chemistry ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,Materials Chemistry ,Composite material ,Electrical conductor ,Mechanical Engineering ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Cathode ,0104 chemical sciences ,Succinonitrile ,chemistry ,Mechanics of Materials ,Electrode ,Lithium ,0210 nano-technology ,Faraday efficiency - Abstract
Interfacial issues arising from the poor interface contact and poor interface stability between the stiff solid-state electrolytes (SSEs) and the electrodes have restricted the development of successful solid-state batteries (SSBs). Herein, we demonstrate that constructing flexible composite cathodes by introducing conductive frameworks consisting of succinonitrile and lithium salt significantly improves the contact performance and interface stability between garnet solid electrolyte and LiFePO4 cathode, enabling the resulted SSBs cycling steadily with high capacity even at room temperature. The introduction of such flexible frameworks not only enables close contact between the cathode and the stiff SSE, but also bridges every electrode and electrolyte particles together forming interconnected three-dimensional ionic conductive paths, reducing the total resistance to one-half of the batteries without such frameworks. On the other hand, the network is flexible enough to accommodate the volume change of LiFeO4 during cycling. These advantages endow that the SSBs of Li/SSE/LiFePO4 with the flexible composite cathodes demonstrate an initial discharge capacity of 149.8 mAh g−1 and the Coulombic efficiency of 99% after 100 cycles at 0.05 C under room temperature. This method demonstrated here to integrate electrodes and stiff electrolytes by introducing flexible components will provides inspirations for people to construct high-performance room-temperature SSBs.
- Published
- 2018
45. Rational construction of an ssa-type of MOF through pre-organizing the ligand's conformation and its exceptional gas adsorption properties
- Author
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De-Li Chen, Xiao-Ping Zhang, Yabing He, Minghui He, Haoyan Zhong, Lisha Zhu, Zhi Tian, Yingying Zhang, and Yao Wang
- Subjects
Materials science ,010405 organic chemistry ,Ligand ,Bent molecular geometry ,010402 general chemistry ,Highly selective ,01 natural sciences ,Combinatorial chemistry ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Adsorption ,Acetylene ,chemistry ,Cluster (physics) - Abstract
Ssa-type MOFs constructed from dicopper paddlewheels and bent diisophthalate ligands exhibit a promising potential for gas adsorption which benefits from their rich open copper sites and polyhedron-based cages with suitable sizes. However, the rational construction of such types of MOFs is exceedingly challenging because the bent diisophthalate ligands employed are inclined to exhibit various conformations and thus are prone to form MOFs with varied topologies. In this work, by pre-organizing the ligand's conformation, we successfully targeted an ssa-type MOF ZJNU-57 from a bent diisophthalate ligand. More significantly, ZJNU-57 exhibits excellent hydrolytic stability and high C2H2 and CO2 uptake capacities as well as impressive C2H2/CH4 and CO2/CH4 adsorption selectivities, indicating its promising potential for C2H2/CH4 and CO2/CH4 separation, which are relevant to acetylene production and natural gas purification. This work not only provides a rare water-stable MOF based on the Cu2(COO)4 cluster for highly selective adsorption of C2H2 and CO2 from CH4, but also demonstrates that the ligand conformation-controlled assembly strategy may be an efficient approach toward the construction of MOF materials with definite topologies for specific applications.
- Published
- 2018
46. Multivalent cations-triggered rapid shape memory sodium carboxymethyl cellulose/polyacrylamide hydrogels with tunable mechanical strength
- Author
-
Hongfang Zhang, Guangxue Chen, Jiahe Huang, Minghui He, Junfei Tian, Wei Chen, Nan Li, and Xiaofang Wan
- Subjects
Polyacrylamide Hydrogel ,Materials science ,Polymers and Plastics ,Sodium ,Composite number ,Polyacrylamide ,Acrylic Resins ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,Cations ,Polymer chemistry ,Materials Chemistry ,medicine ,Molecule ,Organic Chemistry ,Hydrogels ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Carboxymethyl cellulose ,chemistry ,Carboxymethylcellulose Sodium ,Self-healing hydrogels ,engineering ,Biopolymer ,0210 nano-technology ,medicine.drug - Abstract
A novel multivalent cations-triggered shape memory hydrogels were synthesized in a one-pot method, and interpenetrating double network was formed by chemically cross-linked polyacrylamide (PAM) network and physically cross-linked sodium carboxymethyl cellulose network. The temporary shape was fixed by complexation between a native biopolymer, sodium carboxymethyl cellulose (CMC), and transition metal ions, specifically Fe3+, Ag+, Al3+, Cu2+, Ni2+, and Mg2+. In particular, CMC-Fe3+ hydrogel exhibits excellent shape fixity ratio (95%). Therefore, we chose PAM/CMC1.0-Fe3+ hydrogel as the model material and further investigated its shape recovery process. It was found that a wide range of molecules and anions could be applied to break off the temporary cross-links between CMC and Fe3+. The PAM/CMC composite hydrogels also exhibited excellent tunable mechanical properties. The mechanical properties of the composite hydrogel can be adjusted by changing the cross-linking densities. The presented strategy could enrich the construction as well as application of biopolymers based shape memory hydrogels.
- Published
- 2017
47. Ionic Gel Paper with Long-Term Bendable Electrical Robustness for Use in Flexible Electroluminescent Devices
- Author
-
Minghui He, Guangxue Chen, Junfei Tian, Kaili Zhang, and Bin Su
- Subjects
Supercapacitor ,Fabrication ,Materials science ,Nanotechnology ,02 engineering and technology ,engineering.material ,Electroluminescence ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Durability ,Flexible electronics ,0104 chemical sciences ,Coating ,engineering ,General Materials Science ,0210 nano-technology ,Actuator ,Electrical conductor - Abstract
Conductive paper has low-cost, lightweight, sustainability, easy scale-up, and tailorable advantages, allowing for its promising potential in flexible electronics, such as bendable supercapacitors, solar cells, electromagnetic shields, and actuators. Ionic gels, exhibiting a lower Young’s modulus together with facile manufacturing, can fully serve as the conductive component to prepare conductive paper. Herein we report a low-cost (∼1.3 dollars/m2), continuous, and high-throughput (up to ∼30 m/min) fabrication of reliable and long-term (stable for more than two months) conductive paper. As-prepared conductive paper shows a high electrical durability with negligible bending–recovering signal changes over 5000 cycles. Using this ionic gel paper (IGP) as a key component, we build a variety of proof-of-principle demonstrations to show the capacity of IGP in constructing flexible electroluminescent devices with diverse patterns, including a square, an alphabetic string, and a laughing face. Our methodology has...
- Published
- 2017
48. Benzoylformamides as versatile photocaged bases for redox free radical photopolymerization
- Author
-
Ruixin Xu, Minghui He, and Jianwen Yang
- Subjects
Chemistry ,02 engineering and technology ,Benzoyl peroxide ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Redox ,0104 chemical sciences ,Photopolymer ,Polymerization ,medicine ,Radical formation ,Physical and Theoretical Chemistry ,0210 nano-technology ,Dissolution ,medicine.drug - Abstract
Benzoylformamides (BFAs) are proposed as photocaged bases for redox free radical photopolymerization (FRP). Initially the dissolving capacity of BFAs was evaluated. Besides our previously reported photo-latent anion polymerization, BFAs, as versatile photocaged bases, can not only initiate the FRP of acrylates unassisted, but also perform redox FRP in combination with a benzoyl peroxide initiator. We detail a model photopolymerization in the presence of BFA-dBA (N,N-dibenzyl-2-oxo-2-phenylacetamide) as the photocaged base. In combination with a benzoyl peroxide initiator, BFAs are able to initiate the amine-mediated redox photopolymerization of acrylates, and enhance the photopolymerization rate. Finally, we investigated the mechanism of the radical formation to initiate the redox FRP, as exemplified by BFA-dBA.
- Published
- 2016
49. Superhydrophobic WS 2 ‐Nanosheet‐Wrapped Sponges for Underwater Detection of Tiny Vibration
- Author
-
Fachuang Lu, Kaili Zhang, Xiangyang Xu, Ruixin Xu, Bin Su, and Minghui He
- Subjects
Materials science ,General Chemical Engineering ,Acoustics ,Tungsten disulfide ,General Engineering ,General Physics and Astronomy ,Medicine (miscellaneous) ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,0104 chemical sciences ,Vibration ,Vibration sensor ,chemistry.chemical_compound ,chemistry ,General Materials Science ,14. Life underwater ,Underwater ,0210 nano-technology ,Layer (electronics) ,Electrical conductor ,Mechanical energy ,Nanosheet - Abstract
Underwater vibration detection is of great importance in personal safety, environmental protection, and military defense. Sealing layers are required in many underwater sensor architectures, leading to limited working-life and reduced sensitivity. Here, a flexible, superhydrophobic, and conductive tungsten disulfide (WS2) nanosheets-wrapped sponge (SCWS) is reported for the high-sensitivity detection of tiny vibration from the water surfaces and from the grounds. When the SCWS is immersed in water, a continuous layer of bubbles forms on its surfaces, providing the sensor with two special abilities. One is sealing-free feature due to the intrinsic water-repellent property of SCWS. The other is functioning as a vibration-sensitive medium to convert mechanical energy into electric signals through susceptible physical deformation of bubbles. Therefore, the SCWS can be used to precisely detect tiny vibration of water waves, and even sense those caused by human footsteps, demonstrating wide applications of this amphibious (water/ground) vibration sensor. Results of this study can initiate the exploration of superhydrophobic materials with elastic and conductive properties for underwater flexible electronic applications.
- Published
- 2018
50. Flexible thermoelectric nanogenerator based on the MoS2/graphene nanocomposite and its application for a self-powered temperature sensor
- Author
-
Weifeng Yang, Yannan Xie, Ning Li, Ting-Mao Chou, Yingru Zhao, Minghui He, and Zong-Hong Lin
- Subjects
Materials science ,Nanocomposite ,Graphene ,business.industry ,Nanogenerator ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Thermoelectric materials ,01 natural sciences ,Temperature measurement ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,Nanomaterials ,law ,Thermoelectric effect ,Materials Chemistry ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Thermal energy - Abstract
In this work, we report on a flexible thermoelectric nanogenerator (NG) based on the MoS2/graphene nanocomposite. The nanocomposite thermoelectric nanogenerator shows enhanced thermoelectric performance, compared with that based solely on MoS2 nanomaterials, which may be due to the enhanced electrical conductivity resulting from the graphene acting as a charge transfer channel in the composites. The NG can be further applied as a self-powered sensor for temperature measurement. This work indicates that the MoS2/graphene nanocomposite is a promising thermoelectric material for harvesting environmental thermal energy.
- Published
- 2017
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