4,727 results
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2. Flexible and Robust Functionalized Boron Nitride/Poly(p-Phenylene Benzobisoxazole) Nanocomposite Paper with High Thermal Conductivity and Outstanding Electrical Insulation
- Author
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Lin Tang, Kunpeng Ruan, Xi Liu, Yusheng Tang, Yali Zhang, and Junwei Gu
- Subjects
Poly(p-phenylene-2,6-benzobisoxazole) nanofiber ,Boron nitride ,Thermal conductivity ,Electrical insulation ,Technology - Abstract
Highlights m-BN/PNF nanocomposite paper with nacre-mimetic layered structures prepared via sol–gel film transformation approach presents excellent thermal conductivity, incredible electrical insulation, outstanding mechanical property and thermal stability. When the mass fraction of m-BN is 50 wt%, m-BN/PNF nanocomposite paper exhibits excellent thermal conductivity and electrical insulation. The λ ∥ and λ ⊥ are 9.68 and 0.84 W m−1 K−1, and the volume resistivity and breakdown strength are as high as 2.3 × 1015 Ω cm and 324.2 kV mm−1, respectively. The m-BN/PNF nanocomposite paper with 50 wt% m-BN also presents outstanding mechanical properties (tensile strength of 193.6 MPa) and thermal stability (thermal decomposition temperature of 640 °C).
- Published
- 2023
- Full Text
- View/download PDF
3. Flexible and Robust Functionalized Boron Nitride/Poly(p-Phenylene Benzobisoxazole) Nanocomposite Paper with High Thermal Conductivity and Outstanding Electrical Insulation.
- Author
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Tang, Lin, Ruan, Kunpeng, Liu, Xi, Tang, Yusheng, Zhang, Yali, and Gu, Junwei
- Subjects
THERMAL conductivity ,ELECTRIC insulators & insulation ,ELECTRIC conductivity ,NANOCOMPOSITE materials ,THERMAL stability ,BORON nitride ,THERMAL insulation - Abstract
Highlights: m-BN/PNF nanocomposite paper with nacre-mimetic layered structures prepared via sol–gel film transformation approach presents excellent thermal conductivity, incredible electrical insulation, outstanding mechanical property and thermal stability. When the mass fraction of m-BN is 50 wt%, m-BN/PNF nanocomposite paper exhibits excellent thermal conductivity and electrical insulation. The λ
∥ and λ⊥ are 9.68 and 0.84 W m−1 K−1 , and the volume resistivity and breakdown strength are as high as 2.3 × 1015 Ω cm and 324.2 kV mm−1 , respectively. The m-BN/PNF nanocomposite paper with 50 wt% m-BN also presents outstanding mechanical properties (tensile strength of 193.6 MPa) and thermal stability (thermal decomposition temperature of 640 °C). With the rapid development of 5G information technology, thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming prominent. In this work, "high-temperature solid-phase & diazonium salt decomposition" method is carried out to prepare benzidine-functionalized boron nitride (m-BN). Subsequently, m-BN/poly(p-phenylene benzobisoxazole) nanofiber (PNF) nanocomposite paper with nacre-mimetic layered structures is prepared via sol–gel film transformation approach. The obtained m-BN/PNF nanocomposite paper with 50 wt% m-BN presents excellent thermal conductivity, incredible electrical insulation, outstanding mechanical properties and thermal stability, due to the construction of extensive hydrogen bonds and π–π interactions between m-BN and PNF, and stable nacre-mimetic layered structures. Its λ∥ and λ⊥ are 9.68 and 0.84 W m−1 K−1 , and the volume resistivity and breakdown strength are as high as 2.3 × 1015 Ω cm and 324.2 kV mm−1 , respectively. Besides, it also presents extremely high tensile strength of 193.6 MPa and thermal decomposition temperature of 640 °C, showing a broad application prospect in high-end thermal management fields such as electronic devices and electrical equipment. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
4. Microstructure and mechanical properties of multilayer SiC nanofiber paper‐reinforced SiC composites by the NITE method.
- Author
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Chen, Hao, Chen, Jianjun, Yang, Jiahao, Ahmad, Zahoor, Zhu, Mingming, Xiong, Yilian, Tao, Jiyu, and Li, Jinxia
- Subjects
- *
MICROSTRUCTURE , *FRACTURE toughness , *CERAMIC-matrix composites , *BORON nitride , *NANOFIBERS , *CERAMICS , *SINTERING - Abstract
In this work, stacked SiC fibers paper‐reinforced SiC ceramic matrix composites (SiCnf/SiC CMCs) were prepared by nanoimpregnation and transient eutectic (NITE) process using ultra‐long single‐crystal SiC nanofibers. The effect of the SiCnf surface modification via boron nitride (BN) interphase deposition as well as the sintering additive (Al2O3–Y2O3) content on the density, microstructure, and mechanical properties of SiCnf/SiC CMCs has been investigated systematically. The results revealed that the laminated SiCnf/SiC CMCs feature a significant saw‐tooth‐like curve on the load–displacement test, which indicates that the obtained laminated structure with the weak interlayer binding owning to the BN coating treatment possesses significant toughening to the SiC ceramics. Specifically, the SiCnf/SiC CMCs with the sintering additive content of 12 wt% revealed a fracture toughness of over 10 MPa m1/2 after 60 min of BN interface deposition, which is 104.31% higher than that of the composites prepared without BN coating. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
5. Hydrogen‐Bond‐Mediated Surface Functionalization of Boron Nitride Micro‐Lamellae toward High Thermal Conductive Papers
- Author
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Shulei Yu, PeiChi Liao, Yilin Zhang, Yifei Li, Huifeng Tian, Ruijie Li, Shizhuo Liu, Zhixin Yao, Zhenjiang Li, Yihan Wang, Lina Yang Zhang, SASAKI U, Junjie Guo, Lifen Wang, Shulin Bai, Ji Chen, Xuedong Bai, and Lei Liu
- Subjects
boron nitride ,flexibility ,hydrogen bonds ,surface functionalization ,thermal conduction ,Physics ,QC1-999 ,Technology - Abstract
Abstract Wide‐bandgap, layered hexagonal boron nitride (h‐BN) possesses excellent electrical insulation and ultrahigh thermal conductivity simultaneously, offering a perfect candidate for the growing demands of heating dissipations in modern chip industries and power electronics. Hybrids of h‐BN with polymers fulfill the thermal management materials (TMMs) requirement of flexibility, while the composite poses severe challenges in the interfacial bonding and excess thermal resistance. To date, the practical bonding between h‐BN intrinsic surfaces and polymer matrices remains elusive. This work reports on the effective alignment of h‐BN micro‐lamellae by introducing nitrogen‐atoms‐containing polymers as inter‐lamellae bridging mediums. Based on theoretical calculations the hydrogen bonding between polymer chains and the BN surface is revealed by differential charge densities mapping. It is shown experimentally that the neuron‐like polymer bundles strongly bonding surfaces of two neighboring h‐BN platelets as direct, microscopic evidence of the structure models. An extra alignment of h‐BN induced by this strong interfacial interaction leads to a higher degree of h‐BN stacking order, boosting the thermal conduction by eight times. These results reveal one unprecedented method to non‐covalently functionalize the h‐BN surface and expand the TMMs family in the dimension of the filler size, paving the way for exploring the larger‐sized ceramic TMMs.
- Published
- 2023
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6. 2-Dimensional Materials for Performance Enhancement of Surface Plasmon Resonance Biosensor: Review Paper.
- Author
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Wulandari, Chandra, Septiani, Ni Luh Wulan, Nugraha, Nuruddin, Ahmad, and Yuliarto, Brian
- Subjects
- *
SURFACE plasmon resonance , *BORON nitride , *BIOSENSORS , *MOLECULAR kinetics , *TRANSITION metals , *LIGHT absorption - Abstract
Surface plasmon resonance (SPR)--based biosensors compete and excel among optical biosensors because of exceptional features such as high sensitivity, label-free, and real-time measurement, allowing the observation of molecular binding kinetics. In SPR biosensors and other biosensor techniques, surface functionalization and bioreceptor attachment are effective strategies to improve sensor performance. The application of an appropriate immobilization matrix for the bioreceptor is an essential step in maximizing the absorption of the bioreceptor on the sensor surface, thereby improving a specific target-sensor interaction. Furthermore, the materials should provide excellent optical properties to enhance the response signal. The high surface-to-volume ratio and high optical absorption of 2D materials qualify these requirements, thus promising advancements for SPR biosensors. This article reviews the recent SPR biosensor study with the use of the 2D materials family to improve the sensor performance, including graphene, transition metal dichalcogenides (TMDCs), MXene, black phosphorus (BP), perovskite, and boron nitride (BN). The materials properties and enhancement mechanisms of different 2D materials are discussed comprehensively. This review was expected to provide a future perspective and design approach for 2D materials-based SPR biosensors. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
7. Thermal Conductivity Enhancement of Epoxy Composite Based on Hybrid BN and Graphite Particulate Conductive Fillers and Effect of Hybrid Sample Thickness (t) and Filler Fraction on Thermal Resistance (R) and Thermal Conductivity (k)
- Author
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Kumar, Rajesh, Nayak, Sagar Kumar, Panda, Bishnu P., Mohanty, Smita, Nayak, Sanjay K., Thakur, Vijay Kumar, Series Editor, Gupta, Bhuvanesh, editor, Ghosh, Anup K., editor, Suzuki, Atsushi, editor, and Rattan, Sunita, editor
- Published
- 2018
- Full Text
- View/download PDF
8. Inkjet-printed low-dimensional materials-based complementary electronic circuits on paper.
- Author
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Brunetti, Irene, Pimpolari, Lorenzo, Conti, Silvia, Worsley, Robyn, Majee, Subimal, Polyushkin, Dmitry K., Paur, Matthias, Dimaggio, Elisabetta, Pennelli, Giovanni, Iannaccone, Giuseppe, Macucci, Massimo, Pieri, Francesco, Mueller, Thomas, Casiraghi, Cinzia, and Fiori, Gianluca
- Subjects
ELECTRONIC circuits ,ELECTRONIC paper ,DIGITAL electronics ,FLEXIBLE electronics ,LOGIC circuits ,WEARABLE technology ,INK-jet printers ,BORON nitride - Abstract
Complementary electronics has represented the corner stone of the digital era, and silicon technology has enabled this accomplishment. At the dawn of the flexible and wearable electronics age, the seek for new materials enabling the integration of complementary metal-oxide semiconductor (CMOS) technology on flexible substrates, finds in low-dimensional materials (either 1D or 2D) extraordinary candidates. Here, we show that the main building blocks for digital electronics can be obtained by exploiting 2D materials like molybdenum disulfide, hexagonal boron nitride and 1D materials such as carbon nanotubes through the inkjet-printing technique. In particular, we show that the proposed approach enables the fabrication of logic gates and a basic sequential network on a flexible substrate such as paper, with a performance already comparable with mainstream organic technology. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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9. h-FBN assisted negative ion paper spray for the sensitive detection of small molecules
- Author
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Zhenzhen Chen, Xiaoyan Mu, Siyun Qi, Weihua Niu, Bo Tang, Weiqing Wang, Lili Tong, Weifeng Li, and Yanmei Yang
- Subjects
Boron Compounds ,Paper ,Materials science ,Halogenation ,Analytical chemistry ,Signal-To-Noise Ratio ,010402 general chemistry ,Mass spectrometry ,01 natural sciences ,Signal ,Catalysis ,Mass Spectrometry ,Ion ,Background noise ,chemistry.chemical_compound ,Limit of Detection ,Materials Chemistry ,Molecule ,Nanosheet ,010401 analytical chemistry ,Metals and Alloys ,General Chemistry ,Small molecule ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Nanostructures ,chemistry ,Boron nitride ,Ceramics and Composites - Abstract
Negative ion mode paper spray mass spectrometry (PS-MS) suffers from intense background noise and unstable MS signal. For the first time, we reported fluorinated boron nitride nanosheet (h-FBN) assisted negative ion PS-MS for the detection of a series of molecules. We demonstrated that the introduction of h-FBN can greatly improve the detection sensitivity and signal stability in the negative ion mode.
- Published
- 2021
10. Supply Of Molybdenum Sulphide, Tungsten Sulphide, In Boron Nitride, Gemcitabine Hydrochloride, Micro Spatula, Hydrochloric Acid, Acetone, Milipore Filter Paper
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Gemcitabine ,Acetone ,Hydrochloric acid ,Tungsten ,Molybdenum ,Chemical tests and reagents ,Boron nitride ,Business, international - Abstract
Tenders are invited for Supply of Molybdenum Sulphide, Tungsten Sulphide, in Boron Nitride, Gemcitabine Hydrochloride, Micro Spatula, Hydrochloric Acid, Acetone, Milipore Filter Paper Tender Category : Goods Major organization : [...]
- Published
- 2022
11. High-k Boron Nitride Sheets/Polyimide Hybrid Dielectric Layers for the Fabrication of Flexible Organic Transistors on Commercial Graphite Paper.
- Author
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Zhu, Miao, Wei, Xiaoyun, Cao, Jupeng, Xie, Wei, Zou, Changwei, Xiang, Yanxiong, and Meng, Hong
- Subjects
- *
CORPORATE bonds , *BORON nitride , *TRANSISTORS , *ORGANIC field-effect transistors , *DIELECTRICS , *FLEXIBLE electronics , *THERMAL conductivity - Abstract
Organic transistors are crucial components in future flexible electronics due to their excellent properties and ease of circuit integration. Previously, we demonstrated that flexible organic (polyimide) thermal transistors could be prepared using commercial graphite paper as the substrate. These materials exhibited excellent temperature sensitivity, linearity and recoverability due to the intrinsically high thermal conductivity of graphite. In this study, boron nitride (BN) sheets/polyimide hybrid dielectric layers were synthesized for the fabrication of flexible organic transistors using a commercial graphite paper. Under test, the results showed that the introduction of BN sheets was beneficial in improving the mobility and transistor characteristics of the device, as well as enhancing the overall stability. The as-fabricated transistors virtually exhibited no hysteresis at all BN contents. Boron nitride (BN) sheets were added to the fluorinated polyimide (FPI) matrix to form hybrid dielectric layer for improving the performance of flexible organic transistors fabricated on commercial graphite paper. The results showed that the device with BN/FPI hybrid dielectric layer exhibited higher output current (Id) and stability. Besides, the devices remained hysteresis-free at all tested BN sheet contents. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
12. Ab Initio Studies on the Hydrogenation at the Edges and Bulk of Graphene
- Author
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Haldar, S., Bhandary, S., Chandrachud, P., Pujari, B. S., Katsnelson, M. I., Eriksson, O., Kanhere, D., Sanyal, B., Ottaviano, Luca, editor, and Morandi, Vittorio, editor
- Published
- 2012
- Full Text
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13. Toward high thermal conductive aramid nanofiber papers: Incorporating hexagonal boron nitride bridged by silver nanoparticles.
- Author
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Zhuo, Longhai, Chen, Shanshan, Xie, Fan, Qin, Panliang, and Lu, Zhaoqing
- Subjects
- *
SILVER nanoparticles , *ELECTRIC insulators & insulation , *THERMAL conductivity , *ELECTRONIC packaging , *BORON nitride , *HYDROGEN bonding - Abstract
In this work, a novel thermal conductive and electrical insulation h‐BN@AgNPs/ANFs composite paper was fabricated by vacuum‐assisted filtration approach. Specifically, hexagonal boron nitride (h‐BN) was incorporated via polydopamine pretreatment and subsequent decoration by silver nanoparticles, which served as bridges to link neighboring h‐BN sheets. The results revealed that the thermal conductivity of as‐prepared composite paper increased to 1.032 W/m K with 40 wt% filler loading, about 464% higher than the pure ANFs paper, which was attributed to the efficient thermal conductive networks within the paper and strong interfacial combination through hydrogen bonding. Besides, the as‐prepared composite paper exhibited excellent mechanical property with the maximum tensile strength over 90 MPa, and good electrical insulation performance. More importantly, this work provided a promising strategy to achieve high thermal conductivity ANFs based composite paper by constructing efficient thermal conductive networks, which had potential to be used in the field of electronic packaging. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
14. h-FBN assisted negative ion paper spray for the sensitive detection of small molecules.
- Author
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Yang, Yanmei, Niu, Weihua, Wang, Weiqing, Qi, Siyun, Tong, Lili, Mu, Xiaoyan, Chen, Zhenzhen, Li, Weifeng, and Tang, Bo
- Subjects
- *
ANIONS , *SMALL molecules , *BORON nitride , *SIGNAL detection , *MASS spectrometry - Abstract
Negative ion mode paper spray mass spectrometry (PS-MS) suffers from intense background noise and unstable MS signal. For the first time, we reported fluorinated boron nitride nanosheet (h-FBN) assisted negative ion PS-MS for the detection of a series of molecules. We demonstrated that the introduction of h-FBN can greatly improve the detection sensitivity and signal stability in the negative ion mode. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
15. High-Loading Boron Nitride-Based Bio-Inspired Paper with Plastic-like Ductility and Metal-like Thermal Conductivity
- Author
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Guang Xiao, Jianfeng Wang, Shuang Xia, Yunjing Wang, and Jiangtao Di
- Subjects
Toughness ,Materials science ,chemistry.chemical_element ,02 engineering and technology ,Substrate (electronics) ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Flexible electronics ,0104 chemical sciences ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Aluminium ,Boron nitride ,Nanofiber ,General Materials Science ,Composite material ,0210 nano-technology ,Ductility - Abstract
Although desirable in next-generation flexible electronics, fabricating hybrid film materials with excellent integration of mechanical and thermally conductive yet electrically insulating properties is still a challenge. In mollusk nacre, a small volume of the chitin nanofiber framework hosts 95 vol % CaCO3 microplatelets, enabling the high-loading natural composites to exhibit a ductile deformation behavior. Inspired by this, we fabricate a large-area, boron nitride-based bio-inspired paper using a facile sol-gel-film conversion approach, in which BN microplatelets with a loading of 40-80 wt % are embedded into a 3D poly(p-phenylene benzobisoxazole) nanofiber framework. Because of the vital role of the 3D nanofiber framework, the BN-based paper exhibits plastic-like ductility (38-80%), ultrahigh toughness (10-100 MJ m-3), and good folding endurance. The high-loading BN platelets form an oriented, percolative network and endow the paper with outstanding in-plane thermal conductivity (77.1-214.2 W m-1 K-1) comparable to that of some metals, such as aluminum alloys (108-230 W m-1 K-1). Using the electrically insulating BN-based paper as a flexible substrate, we demonstrate its promising application for lowering the temperature of electronic devices.
- Published
- 2020
16. Graphitic Thermal Paper Market Size to Reach US$ 1.3 Billion in 2025, Says Stratview Research
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Boron nitride ,Automotive electronics ,Paper industry ,Graphite ,Personal computers ,LEDs ,General interest ,News, opinion and commentary - Abstract
DETROIT: Stratview Research has issued the following press release: Stratview Research announces the launch of a new research report on Graphitic Thermal Paper Market By Product Type (Natural Graphite Sheet, [...]
- Published
- 2020
17. Facial fabrication of aramid composite insulating paper with high strength and good thermal conductivity
- Author
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Mengjie Li, Yufan Zhu, and Cuiqing Teng
- Subjects
Thermal contact conductance ,Materials science ,Polymers and Plastics ,Dielectric strength ,Composite number ,Electrical insulation paper ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Thermal conduction ,01 natural sciences ,0104 chemical sciences ,Aramid ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Mechanics of Materials ,Boron nitride ,Materials Chemistry ,Ceramics and Composites ,Composite material ,0210 nano-technology - Abstract
High strength and good thermal dissipation become the inevitable requirements for the next generation of insulation materials. Here, we report a facile method to prepare composite insulating papers by incorporating two-dimensional layered boron nitride nanosheets (BNNSs) into aramid nanofibers and aramid pulp. Their layer-by-layer structure fabricated by a vacuum-assisted filtration of their mixture suspension is similar to “brick – mortar” arrangement, contributing to the enhanced mechanical properties due to their strong interaction. Meanwhile, BNNSs act as heat-conducting “bridges”, which provide the phonon conduction channels and reduce the interface thermal contact resistance. The thermal conductivity of the composite paper with 20% loading of BNNS reaches 4.34 W m-1 K-1 and the dielectric strength is up to 59.6 kV mm-1; whereas, the values of the parallel sample without BNNS are only 0.98 W m-1 K-1 and 25.1 kV mm-1, respectively. The composite papers possess highly thermal conductivities, outstanding electrical insulation and thermal stabilities, and excellent mechanical strength and flexibility, showing great potential applications in the field of flexible electronics.
- Published
- 2020
18. A small amount of delaminated Ti3C2 flakes to greatly enhance the thermal conductivity of boron nitride papers by assembling a well-designed interface
- Author
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Xianwu Huang and Peiyi Wu
- Subjects
Materials science ,Composite number ,Composite film ,Nanomaterials ,law.invention ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,law ,Boron nitride ,Ultimate tensile strength ,Materials Chemistry ,General Materials Science ,Electronics ,Composite material ,Filtration - Abstract
The rapid development of electronic equipment has led to stricter requirements for thermal management materials. Traditional polymeric composites cannot satisfy these demands due to their low thermal conductivity (TC). The rapid development of two-dimensional (2D) nanomaterials with high intrinsic TC provides us with a new avenue to prepare highly thermally conductive composites. In our work, small amounts of exfoliated Ti3C2Tx nanosheets were chosen to cooperate with boron nitride nanosheets to fabricate hierarchically layered composite films by vacuum-assisted filtration. We found that small amounts of Ti3C2Tx reform the in-plane TC of the composite film. Our experimental results show that when the mass content of Ti3C2Tx in the hybrid fillers is 5%, this composite film possesses an exceptionally high in-plane thermal conductivity up to 52.4 W m−1 K−1 and still maintains the favorable electrical insulating property. Besides, more interestingly, the small addition of Ti3C2Tx can simultaneously improve the tensile strength and the fracture strain of the film. We attribute the enhancement of thermal-conducting performance to the well-designed interface assembled by MXene. Therefore, this freestanding composite film has immense applied value in highly integrated electronic devices.
- Published
- 2020
19. VANDERBILT ENGINEERS' SCIENCE PAPER REVIEWS SCOPE OF ATOMICALLY THIN MEMBRANES FOR SUBATOMIC SEPARATIONS
- Subjects
Engineers ,Boron nitride ,News, opinion and commentary ,Vanderbilt University - Abstract
NASHVILLE, Tenn. -- The following information was released by Vanderbilt University: A paper by Vanderbilt engineers that explores the scope to scale up the sizes of atomically thin membranes and [...]
- Published
- 2021
20. Thermally Conductive and Electrical Insulation BNNS/CNF Aerogel Nano-Paper
- Author
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Xiu Wang, Hongqi Dai, Huiyang Bian, Zhihuai Yu, Huining Xiao, and Weibing Wu
- Subjects
chemistry.chemical_classification ,3D skeleton ,Materials science ,Polymers and Plastics ,Communication ,aerogel ,Aerogel ,General Chemistry ,Polymer ,BNNS ,lcsh:QD241-441 ,chemistry.chemical_compound ,Thermal conductivity ,nano-paper ,lcsh:Organic chemistry ,chemistry ,Electrical resistivity and conductivity ,Boron nitride ,CNF ,Nano ,thermal conductivity ,electrical insulation ,Composite material ,Electrical conductor ,Template method pattern - Abstract
Adding heat conducting particles to a polymer matrix to prepare thermally conductive and electrical insulation materials is an effective approach to address the safety issues arising from the accumulation of heat in the working process of electronic devices. In this work, thermally conductive and electrical insulation nano-paper, consisting of Boron Nitride nano-sheet (BNNS) and cellulose nanofiber (CNF), was prepared using an aerogel 3D skeleton template method. For comparison, BNNS/CNF nano-paper was also produced using a simple blending method. At a BNNS loading of 50 wt%, the thermal conductivity of BNNS/CNF aerogel nano-paper and blended nano-paper at 70 °C are 2.4 W/mK and 1.2 W/mK respectively, revealing an increase of 94.4%. Under similar conditions, the volume resistivity of BNNS/CNF aerogel nano-paper and blended nano-paper are 4.0 × 1014 and 4.2 × 1014 Ω·cm respectively. In view of its excellent thermal conductivity and electrical insulation performance, therefore, BNNS/CNF aerogel nano-paper holds great potential for electronic-related applications.
- Published
- 2019
21. Highly Thermal Conductivities, Excellent Mechanical Robustness and Flexibility, and Outstanding Thermal Stabilities of Aramid Nanofiber Composite Papers with Nacre-Mimetic Layered Structures
- Author
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Xirui Liu, Yongqiang Guo, Tengbo Ma, Junwei Gu, Yongsheng Zhao, Kunpeng Ruan, Junliang Zhang, Jie Kong, and Xutong Yang
- Subjects
Materials science ,Composite number ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Hot pressing ,01 natural sciences ,0104 chemical sciences ,Aramid ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,Ultimate tensile strength ,Interfacial thermal resistance ,General Materials Science ,Composite material ,0210 nano-technology ,Nanosheet - Abstract
Aramid nanofiber (ANF) paper has shown potential applications in flexible electronics. However, its inherent low thermal conductivity coefficient (λ) values might threaten the safety of devices under a high-power working condition. In this work, polydopamine-functionalized boron nitride nanosheet (BNNS@PDA)/ANF thermally conductive composite papers with nacre-mimetic layered structures were prepared via highly efficient vacuum-assisted filtration followed by hot pressing. For a given BNNS loading, the surface functionalization of BNNS could further enhance the thermal conductivities and mechanical properties of BNNS@PDA/ANF composite papers. BNNS@PDA/ANF composite papers presented anisotropic thermal conductivities, and the through-plane (λ⊥) and in-plane (λ∥) values of the 50 wt % BNNS@PDA/ANF composite papers reached 0.62 and 3.94 W/mK, 181.8 and 196.2% higher than those of original ANF paper, respectively, which were also higher than those of 50 wt % BNNS/ANF composite papers (λ⊥ = 0.52 W/mK and λ∥ = 3.33 W/mK). The tensile strength of the 50 wt % BNNS@PDA/ANF composite papers reached 36.8 MPa, 30.5% higher than that of 50 wt % BNNS/ANF composite papers (28.2 MPa). In addition, the heat resistance index (THRI) of the 50 wt % BNNS@PDA/ANF composite papers was further increased to 223.1 °C. Overall, our fabricated BNNS@PDA/ANF composite papers possess highly thermal conductivities, excellent mechanical robustness and flexibility, and outstanding thermal stabilities, showing great potential applications in the fields of intelligent wearable equipment, flexible supercapacitors, and flexible electronics.
- Published
- 2019
22. Thermally Conductive Boron Nitride Nanosheet Composite Paper as a Flexible Printed Circuit Board
- Author
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Xiaoliang Fang, Shusen Jiang, Xinyi Chen, Miao Lu, Daohui Ou, Huanhuan Liu, Tun Wang, and Wanying Huang
- Subjects
Materials science ,Coplanar waveguide ,Composite number ,02 engineering and technology ,Fiberglass mesh ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Flexible electronics ,0104 chemical sciences ,Printed circuit board ,chemistry.chemical_compound ,chemistry ,Boron nitride ,General Materials Science ,Electronics ,Composite material ,0210 nano-technology ,Electrical conductor - Abstract
The development of portable and wearable electronic devices has substantially increased the demand for printed circuit boards with high thermal conductivity, optimal mechanical flexibility, electrical insulativity, and minimal high-frequency transmission loss. Herein, we demonstrate the fabrication of a thermally conductive, flexible composite paper, for electronic and microwave devices, based on hexagonal boron nitride nanosheets, poly(vinyl alcohol) (PVA), and fiberglass mesh (FGM). The prepared composite paper exhibits in-plane thermal conductivity of 22.51 W/(m·K), and the FGM induced high mechanical strength of 27.92 MPa. The transmission loss, of the grounded coplanar waveguide lines, was 0.10 dB/mm at 7.0 GHz, and shows negligible variation while bending, indicating the high flexibility of the circuit board. These results demonstrate potential application of BN-based composite paper in flexible electronic devices.
- Published
- 2018
23. Massive enhancement in power output of BoPET-paper triboelectric nanogenerator using 2D-hexagonal boron nitride nanosheets
- Author
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Kuzhichalil Peethambharan Surendran, Harris Varghese, Ainikulangara Sundaran Bhavya, and Achu Chandran
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,business.industry ,Open-circuit voltage ,Nanogenerator ,law.invention ,chemistry.chemical_compound ,BoPET ,chemistry ,Boron nitride ,law ,Finger tapping ,Optoelectronics ,General Materials Science ,Electrical and Electronic Engineering ,business ,Short circuit ,Triboelectric effect ,Light-emitting diode - Abstract
In the present era of the Internet of Things (IoT) and sensor networks, clean and sustainable power sources are in huge demand, and triboelectric nanogenerators (TENGs) are a hot cake in green energy production. Here, we have developed a contact-separation mode TENG using liquid-phase exfoliated 2D-hexagonal boron nitride nanosheets (BNNSs) coated on biaxially-oriented polyethylene terephthalate (BoPET) and paper as counter triboelectric materials, which showed an impressive 70 times higher power output than simple BoPET-paper TENG assembly. Even under a moderate finger tapping force (~3 N), the developed BNNSs/BoPET-paper TENG device could generate an open circuit output voltage of ~200 V and a short circuit current density of ∼0.48 mA/m2. While under load testing, the peak value of electric power density for the BNNSs/BoPET-paper TENG device reached ~0.14 W/m2 at 200 MΩ resistive load. The incorporation of BNNSs has significantly enhanced the electron-accepting capabilities of the BoPET film which is evident from the enhanced dielectric permittivity of the BNNSs/BoPET assembly, and thus resulted in the enhanced electrical output of TENG. Additionally, the fabricated BNNSs-TENG was successfully demonstrated for powering electronic gadgets such as LCD clock, digital thermometer, and LEDs through cyclic finger tapping force.
- Published
- 2021
24. High-temperature dielectric paper with high thermal conductivity and mechanical strength by engineering the aramid nanofibers and boron nitride nanotubes
- Author
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Li-Chuan Jia, Junwen Ren, Wenfu Wei, Xiaolong Huang, Chengmei Wei, Wang Zhong, Zihan Li, Lihua Zhao, and Wenjun Ning
- Subjects
Hydrogen bond ,Dielectric performance ,Materials science ,Mechanical Engineering ,Composite number ,Mechanical properties ,Dielectric ,Aramid ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Mechanics of Materials ,Boron nitride ,Nanofiber ,TA401-492 ,General Materials Science ,Dielectric loss ,Thermal stability ,Boron nitride nanotubes ,Composite material ,Materials of engineering and construction. Mechanics of materials ,Aramid nanofibers - Abstract
Aramid paper is ubiquitous in advanced electronics and high-voltage equipment by virtue of their outstanding dielectric properties, mechanical reliability, and thermal stability. However, their limited thermal conductivity still fails to satisfy the stringent demands for heat dissipation in applications with high power and high energy density. Herein, we report a highly thermally conductive composite paper prepared by synergistically combining one-dimensional (1D) aramid nanofibers (ANFs), 1D edge-hydroxylated boron nitride nanotubes (BNNTs), and polyethyleneimine (PEI). The resultant composite paper exhibits high thermal conductivity (9.91 Wm−1K−1), low dielectric loss (
- Published
- 2021
25. Highly thermally conductive flexible insulated PI/BNNS@rGO nanocomposite paper with a three-dimensional network bridge structure.
- Author
-
Yu, Baokang, Zhou, Yuhang, Luo, Zhouai, Fan, Jie, He, Jianxin, Liu, Yong, and Jin, Xuling
- Subjects
- *
POLYIMIDES , *THERMAL interface materials , *NANOCOMPOSITE materials , *NANOFIBERS , *BORON nitride , *THERMAL conductivity , *ELECTRIC insulators & insulation - Abstract
[Display omitted] • Exfoliated BNNS obtained through hydrothermal reaction and in ball milling. • The rGO acts as a bridge connecting the adjacent and stacked BNNS layers, increasing the number of thermal conductivity pathways. • Highly enhanced in-plane TC up to 16.92 W m−1 k−1 with 50 wt% BNNS and 2.5 wt% rGO loading. The sharp increases in power consumption and heating capacity caused by the emergence of intelligent electronic devices necessitate the development of highly thermally conductive thermal interface materials (TIMs) with good heat dissipation properties. Boron nitride nanosheets (BNNS) are ideal materials with high thermal conductivity. Hence, it should be possible to produce flexible high thermal conductivity nanocomposites with a three-dimensional network containing ultrathin, large, and uniformly thick BNNS. In this study, large-scale (1–1.5 µm) fewer-layered (2 nm) BNNS with a high yield of 80% were prepared through the separation of a NaOH–LiCl aqueous solution by a hydrothermal method and in ball milling. Highly thermally conductive insulating nanocomposite paper with a three-dimensional bridging structure of two-component nanosheets filled with nanofibers was fabricated by a simple electrospinning–electrospraying technique. The mechanical properties of the polyimide (PI)/BNNS@reduced graphene oxide nancomposite paper were improved by 168% as compared with those of the PI/BNNS composite. With an increase in the BNNS content, a layered microstructure similar to that of natural nacre was produced, which resulted in a large in-plane thermal conductivity of 16.92 W/m·K. The described method can facilitate the design of TIMs with good electrical insulation properties, thermal stability, and flexibility. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
26. High-Quality Boron Nitride Nanosheets and Their Bioinspired Thermally Conductive Papers
- Author
-
Jiheng Ding, Haibin Yu, Zhenzong Shao, Hongran Zhao, Beiyu Xu, and Zhou Qingbo
- Subjects
Yield (engineering) ,Materials science ,Graphene ,Intercalation (chemistry) ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Exfoliation joint ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Chemical engineering ,law ,Boron nitride ,Heat transfer ,General Materials Science ,Thermal stability ,0210 nano-technology - Abstract
Hexagonal boron nitride has displayed increased potential in heat dissipation applications due to its desirable high thermal conductivity and remarkable thermal stability. However, the large-yield and high-quality preparation of boron nitride nanosheets (BNNSs) has been still an enormous challenge. In present work, we developed a universal exfoliation strategy to synthesize few-layer and defect-free BNNSs, which involved the intercalation of hexafluorosilicates/sodium hydroxide into BN crystals followed by exfoliation through a mild stirring process. The yield and concentration of as-obtained BNNS reached up to 78.5% and 12.78 mg/mL, respectively. More importantly, this method has been proven to exfoliate other layered materials like graphene (G), MoS2, and WS2. These as-obtained BNNSs can be directly used for constructing freestanding papers with high thermal conductivities. Typically, the thermal conductivities of the BNNS-G hybrid paper were up to 63.5 W/mK along the in-plane direction and 7.4 W/mK along the through-plane direction. According to the thermal interface materials performance measures, BNNS-G hybrid paper shows great promising applications for heat transfer in integrated circuit packaging.
- Published
- 2019
27. High-k Boron Nitride Sheets/Polyimide Hybrid Dielectric Layers for the Fabrication of Flexible Organic Transistors on Commercial Graphite Paper
- Author
-
Jupeng Cao, Changwei Zou, Yanxiong Xiang, Xiaoyun Wei, Wei Xie, Hong Meng, and Miao Zhu
- Subjects
Fabrication ,Materials science ,business.industry ,Transistor ,Dielectric ,Condensed Matter Physics ,Flexible electronics ,law.invention ,chemistry.chemical_compound ,chemistry ,Boron nitride ,law ,Optoelectronics ,General Materials Science ,Graphite ,business ,Polyimide ,High-κ dielectric - Abstract
Organic transistors are crucial components in future flexible electronics due to their excellent properties and ease of circuit integration. Previously, we demonstrated that flexible organic (polyimide) thermal transistors could be prepared using commercial graphite paper as the substrate. These materials exhibited excellent temperature sensitivity, linearity and recoverability due to the intrinsically high thermal conductivity of graphite. In this study, boron nitride (BN) sheets/polyimide hybrid dielectric layers were synthesized for the fabrication of flexible organic transistors using a commercial graphite paper. Under test, the results showed that the introduction of BN sheets was beneficial in improving the mobility and transistor characteristics of the device, as well as enhancing the overall stability. The as-fabricated transistors virtually exhibited no hysteresis at all BN contents.
- Published
- 2020
28. Highly Thermally Conductive Composite Papers Prepared Based on the Thought of Bioinspired Engineering
- Author
-
Ching-Ping Wong, Jianbin Xu, Rong Sun, Yimin Yao, and Xiaoliang Zeng
- Subjects
Materials science ,Composite number ,Nanowire ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Silver nanoparticle ,0104 chemical sciences ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,Silicon carbide ,General Materials Science ,Electronics ,0210 nano-technology ,Electrical conductor - Abstract
The rapid development of modern electronics and three-dimensional integration sets stringent requirements for efficient heat removal of thermal-management materials to ensure the long lifetime of the electronics. However, conventional polymer composites that have been used widely as thermal-management materials suffer from undesired thermal conductivity lower than 10 W m(-1) K(-1). In this work, we report a novel thermally conductive composite paper based on the thought of bioinspired engineering. The advantage of the bioinspired papers over conventional composites lies in that they possess a very high in-plane thermal conductivity up to 21.7 W m(-1) K(-1) along with good mechanical properties and high electrical insulation. We attribute the high thermal conductivity to the improved interfacial interaction between assembled components through the introduction of silver nanoparticles and the oriented structure based on boron nitride nanosheets and silicon carbide nanowires. This thought based on bioinspired engineering provides a creative opportunity for design and fabrication of novel thermally conductive materials, and this kind of composite paper has potential applications in powerful integrated microelectronics.
- Published
- 2016
29. Significant Enhancement of Thermal Conductivity in Bioinspired Freestanding Boron Nitride Papers Filled with Graphene Oxide
- Author
-
Rong Sun, Xiaoliang Zeng, Fangfang Wang, Ching-Ping Wong, Jianbin Xu, and Yimin Yao
- Subjects
Fabrication ,Materials science ,Graphene ,General Chemical Engineering ,Oxide ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,law ,Materials Chemistry ,Miniaturization ,0210 nano-technology ,Science, technology and society ,Electrical conductor - Abstract
Owing to the miniaturization of power electronics and the development of portable and flexible devices, demands for highly thermally conductive, mechanically flexible, and electrically insulating composites have substantially increased. However, the conventional method to improve thermal conductivity usually yields both an undesired value (usually below 10 W m–1 K–1) and poor flexibility. Thus, a combination of all the desired properties together remains a technical challenge. Bioinspired engineering offers great promise in the synthesis and fabrication of thermal materials that are different from engineering through conventional approaches. Inspired by the interface and orientation of natural nacre, we report on thermally conductive and mechanically flexible papers based on boron nitride nanosheets (BNNSs) and graphene oxide (GO) via a simple vacuum-assisted filtration process. We experimentally show that the papers possess high thermal conductivity of 29.8 W m–1 K–1, excellent mechanical flexibility, an...
- Published
- 2016
30. Thermally stable and flexible paper photosensors based on 2D BN nanosheets
- Author
-
Meng-Lin Tsai, Liangbing Hu, Soo-Hwan Jang, Chun-Ho Lin, Hui-Chun Fu, Bin Cheng, Lihui Zhou, Wei Luo, and Jr-Hau He
- Subjects
Materials science ,business.industry ,Photodetector ,Flexible electronics ,Electronic mail ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,Thermal ,Optoelectronics ,Thermal stability ,Electronics ,business - Abstract
The market for printed and flexible electronics, key attributes for internet of things, is estimated to reach $45 billion by 2016 and paper-based electronics shows great potential to meet this increasing demand due to its popularity, flexibility, low cost, mass productivity, disposability, and ease of processing [1]. In the family of flexible electronics, solar-blind deep ultraviolet (DUV) photodetectors (PDs) can be widely applied in wearable applications such as military sensing, automatization, short-range communications security and environmental detection [2]. However, conventional flexible devices made of paper and plastic substrates are expected to have thermal issues due to their poor thermal conductivity. For instance, conventional paper has a very low thermal conductivity of 0.03 W/mK as that of plastic is 0.23 W/mK. As a result, it is required to increase the thermal conductivity of the substrates used for flexible electronics. In this work, we present flexible DUV paper PDs consisting of 2D boron nitride nanosheets (BNNSs) and 1D nanofibrillated celluloses (NFCs) with good detectivity (up to 8.05 × 1010 cm Hz1/2/W), fast recovery time (down to 0.393 s), great thermal stability (146 W/m K, 3-order-of-magnitude larger than conventional flexible substrates), high working temperature (up to 200 °C), excellent flexibility and bending durability (showing repeatable ON/OFF switching during 200-time bending cycles), which opens avenues to the flexible electronics.
- Published
- 2017
31. Hydrogen‐Bond‐Mediated Surface Functionalization of Boron Nitride Micro‐Lamellae toward High Thermal Conductive Papers.
- Author
-
Yu, Shulei, Liao, PeiChi, Zhang, Yilin, Li, Yifei, Tian, Huifeng, Li, Ruijie, Liu, Shizhuo, Yao, Zhixin, Li, Zhenjiang, Wang, Yihan, Zhang, Lina Yang, U, SASAKI, Guo, Junjie, Wang, Lifen, Bai, Shulin, Chen, Ji, Bai, Xuedong, and Liu, Lei
- Subjects
ELECTRIC insulators & insulation ,BORON nitride ,INTERFACIAL bonding ,POWER electronics ,THERMAL resistance ,HYDROGEN bonding - Abstract
Wide‐bandgap, layered hexagonal boron nitride (h‐BN) possesses excellent electrical insulation and ultrahigh thermal conductivity simultaneously, offering a perfect candidate for the growing demands of heating dissipations in modern chip industries and power electronics. Hybrids of h‐BN with polymers fulfill the thermal management materials (TMMs) requirement of flexibility, while the composite poses severe challenges in the interfacial bonding and excess thermal resistance. To date, the practical bonding between h‐BN intrinsic surfaces and polymer matrices remains elusive. This work reports on the effective alignment of h‐BN micro‐lamellae by introducing nitrogen‐atoms‐containing polymers as inter‐lamellae bridging mediums. Based on theoretical calculations the hydrogen bonding between polymer chains and the BN surface is revealed by differential charge densities mapping. It is shown experimentally that the neuron‐like polymer bundles strongly bonding surfaces of two neighboring h‐BN platelets as direct, microscopic evidence of the structure models. An extra alignment of h‐BN induced by this strong interfacial interaction leads to a higher degree of h‐BN stacking order, boosting the thermal conduction by eight times. These results reveal one unprecedented method to non‐covalently functionalize the h‐BN surface and expand the TMMs family in the dimension of the filler size, paving the way for exploring the larger‐sized ceramic TMMs. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
32. Boron nitride nanosheets: Large-scale exfoliation in NaOH-LiCl solution and their highly thermoconductive insulating nanocomposite paper with PI via electrospinning-electrospraying.
- Author
-
Yu, Baokang, Fan, Jie, He, Jianxin, Liu, Yong, Wang, Rongwu, Qi, Kun, Han, PengJu, and Luo, Zhouai
- Subjects
- *
BORON nitride , *THERMAL insulation , *NANOSTRUCTURED materials , *THERMAL management (Electronic packaging) , *NANOCOMPOSITE materials , *FIBROUS composites , *NANOFIBERS - Abstract
The miniaturisation of electronic components requires high-performance materials with insulating and thermal conductive properties for electronic packaging and thermal management. Boron nitride nanosheets (BNNS) are a desirable thermal conductive filler due to their excellent thermal stability, chemical stability, and high thermoconductivity. However, it remains challenging to mass produce ultra-thin large-scale BNNS and combine them with small amounts of polymers to fabricate malleable thermoconductive composites for flexible electronic devices. Herein, we report a new method to prepare BNNS at high yield by high-temperature oxidation treatment followed by hydrothermal exfoliation in NaOH-LiCl solution. We further fabricated flexible, insulating, and highly thermoconductive BNNS/PI (polyimide) nanocomposite paper, via a scalable layer-by-layer process that involves electrospinning of PI fibres and eletrospraying of BNNS. The prepared BNNS have a transverse size of 1.18 µm and a thickness of 1–2.9 nm, with a high yield of 75.48% at a concentration of 3.38 mg mL− 1. The BNNS/PI nanocomposite paper exhibited an ultrahigh in-plane thermal conductivity (7.58 W m−1 K−1), 2005% higher than that of the pure PI nanofibre composite. This simple method has wide application potential in next-generation electronic devices to design thermal interface materials with excellent electrical insulation, thermostability, and flexibility. [Display omitted] • Exfoliated BNNS obtained through thermal oxidation and hydrothermal reaction. • BNNS were arranged along PI nanofibre direction by electrospraying. • Highly enhanced in-plane TC up to 7.58 W m−1 k−1 with 50 wt% BNNS loading. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
33. Enhanced through-plane thermal conductivity of paper-like cellulose film with treated hybrid fillers comprising boron nitride and aluminum nitride
- Author
-
Jooheon Kim and Wondu Lee
- Subjects
Filler (packaging) ,Materials science ,General Engineering ,02 engineering and technology ,Nitride ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Exfoliation joint ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Boron nitride ,Nanofiber ,Ceramics and Composites ,Surface modification ,Thermal stability ,Composite material ,0210 nano-technology ,Ball mill - Abstract
A one-step exfoliation and functionalization method using ball milling was employed to prepare an amine-group-treated hybrid filler (BA-NH2) comprising boron nitride (BN) and aluminum nitride (AlN). A thermal conductive film (CNF/BAH-NH2) was then fabricated using the hybrid filler (BA-NH2) and a cellulose nanofiber (CNF) matrix via vacuum filtration and hot-press processing. After treating the surfaces of each of the fillers, the hybrid filler exhibited better dispersion in the film matrix by hydrogen bonding interactions for improved interfacial adhesion between the filler and matrix. Moreover, the treated AlN particles deposited on the surface-treated BN assist in the formation of heat-transfer paths along the through-plane direction. Hence, the thermal conductivity increased from 0.5 W m−1 K−1 (neat CNF film) to 5.93 W m−1 K−1 (50 wt% filler loading), which was a 1092% enhancement compared with the neat CNF film, and the thermal stability was enhanced by 27% (62.5 °C). Moreover, favorable mechanical properties such as tensile stress of 35.93 MPa and elongation at break of 4.09% were observed for the film.
- Published
- 2020
34. Exceptional electrical and thermal transport properties in tunable all-graphene papers
- Author
-
Hong Xu, Jin Tang, Zhi-Ling Hou, Xingming Bian, Wei-Li Song, and Lin Liu
- Subjects
Materials science ,Phonon ,Graphene ,General Chemical Engineering ,Oxide ,Nanotechnology ,General Chemistry ,law.invention ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,law ,Thermal ,Electrical conductor ,Decoupling (electronics) - Abstract
Lightweight thermally conductive materials of various electrical features, ranging from insulators such as boron nitride composites to highly conductive graphene-based materials, are increasingly attractive in substituting traditional metal materials for many practical applications. Herein we take a new insight into the electrical and thermal transport properties of the flexible all-graphene papers, where electrically and thermally insulating graphene oxide nanosheets (GO) serve as unique interfaces in the graphene papers stacked by electrically and thermally conductive graphene nanosheets (GN). Anisotropic all-graphene papers with decoupling of thermal and electrical transport properties have been achieved based on controlling the electron and phonon transport paths at the GN–GO interfaces. The fundamental mechanism of the exclusive electrical and thermal transport behaviors in the all-graphene papers has been discussed, indicating more advantageous features in manipulating the transport properties in comparison with other conventional graphene/polymer composites. The implication of the tunable thermal conductivity in the entire semi-conductive range suggests a conceptually novel stage toward fabricating advanced graphene materials of various electrical features for wide thermal management.
- Published
- 2015
35. Electronic and Transport Properties of Boron Nitride Nanodevice.
- Author
-
Danglyan, I. M., Kazaryan, E. M., and Hayrapetyan, D. B.
- Subjects
- *
BORON nitride , *ELECTRONIC paper , *DENSITY functional theory , *OPTOELECTRONIC devices , *CHEMICAL properties - Abstract
Boron Nitride Nanotubes are valued due to their physical and chemical properties. They can be found their possible applications in the field of design and developing of optoelectronic devices of new generation. In this paper the transport and electronic properties of both clear Boron Nitride and Boron Nitride Nanotube with embedded carbon atoms have been calculated in the framework of Density Functional Theory (DFT). Results show that nanodevice with embedded carbon atoms has wider transmission spectrum than clear one. It has been computed transmission eigenvalues for both nanodevices. Nanodevice with impurity has higher transmission eigenvalues than clear one. [ABSTRACT FROM AUTHOR]
- Published
- 2019
36. Significant Enhancement of Thermal Conductivity in Bioinspired Freestanding Boron Nitride Papers Filled with Graphene Oxide.
- Author
-
Yimin Yao, Xiaoliang Zeng, Fangfang Wang, Rong Sun, Jian-bin Xu, and Ching-Ping Wong
- Subjects
- *
THERMAL conductivity , *BORON nitride , *GRAPHENE oxide , *POWER electronics , *COMPOSITE materials , *INSULATING materials - Abstract
Owing to the miniaturization of power electronics and the development of portable and flexible devices, demands for highly thermally conductive, mechanically flexible, and electrically insulating composites have substantially increased. However, the conventional method to improve thermal conductivity usually yields both an undesired value (usually below 10 W m-1 K-1) and poor flexibility. Thus, a combination of all the desired properties together remains a technical challenge. Bioinspired engineering offers great promise in the synthesis and fabrication of thermal materials that are different from engineering through conventional approaches. Inspired by the interface and orientation of natural nacre, we report on thermally conductive and mechanically flexible papers based on boron nitride nanosheets (BNNSs) and graphene oxide (GO) via a simple vacuum-assisted filtration process. We experimentally show that the papers possess high thermal conductivity of 29.8 W m-1 K-1, excellent mechanical flexibility, and satisfactory electrical insulation. We attribute the high thermal conductivity to the well-designed BNNS-GO interface as well as the advantageous orientation in layered structure. This approach to constructing thermally conductive composites provides a creative opportunity for design and fabrication of high-performance materials in the near future, and this kind of paper has great potential application in next-generation commercial portable electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
37. Superhydrophobic and thermally conductive carbon black/hexagonal boron nitride@Fe3O4/cellulose composite paper for electromagnetic interference shielding.
- Author
-
Habibi, Navid and Pourjavadi, Ali
- Subjects
- *
ELECTROMAGNETIC shielding , *ELECTROMAGNETIC interference , *CARBON-black , *THERMAL conductivity , *BORON nitride , *ELECTRIC conductivity - Abstract
Herein, a series of superhydrophobic thin polyacrylic resin-coated carbon black (CB)/hexagonal boron nitride (h-BN)@Fe 3 O 4 /cellulose composite papers with good flexibility, low density (~0.67 g/cm3), high electrical conductivity (~0.065 S/cm), good thermal conductivity (0.462 W.m−1. K−1), and with water contact angle (WCA) of 153° were successfully fabricated by a facile dip-coating/spraying method. The CB-BN@Fe 3 O 4 distribution in cellulose matrix provided high electrical conductivity in the in-plane and thickness directions. The electrical conductivity in both in-plane and thickness directions increased by increasing the number of vacuum-assisted dip-coating cycles. Moreover, these composites exhibited excellent electromagnetic interference shielding effectiveness (EMI SE) in the frequency range of 8.2–12.4 GHz. The absorption was the main mechanism for attenuation of EM waves for this composite paper. A multilayer of this composite with 12 wt% filler exhibited a higher EMI SE of 68.2 dB compared to its monolayer composite. The composites showed good thermal stability and excellent stability against washing and 150 times bending tests. Overall, this study proposes that polyacrylic resin-coated CB/BN@Fe 3 O 4 /cellulose papers can be used as wallpaper in buildings such as hospitals and antenna rooms that are exposed to electromagnetic waves. [Display omitted] • Polyacrylic resin coated CB/BN@Fe 3 O 4 /cellulose paper was prepared through a facile dip-coating/spraying method. • This composite paper showed superhydrophobic behavior with WCA of 153° and thermal conductivity of 0.462 W.m−1. K−1. • The EMI SE of this composite reaches as high as 68.2 dB in a multilayer form. • This composite was physically durable after 150 times of bending test and after washing process. • This composite can be used as portable EMI shielding materials or wallpaper in buildings such as hospitals and antenna room. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
38. Effect of silver nanoparticles decoration on the thermal conductivity of boron nitride nanosheets/silicon carbide nanowires bioinspired composite paper
- Author
-
Ching-Ping Wong, Rong Sun, Yimin Yao, Jianbin Xu, and Xiaoliang Zeng
- Subjects
Materials science ,Thermal resistance ,Composite number ,Nanowire ,Nanotechnology ,02 engineering and technology ,Conductivity ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Silver nanoparticle ,0104 chemical sciences ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,Silicon carbide ,0210 nano-technology - Abstract
Heat generated by electronic devices and circuitry must be dissipated to improve their performance, reliability and prevent the premature failure. One of important methods is to fabricate composites with high thermal conductivity. In this study, we develop a novel approach for surface modification of boron nitride nanosheets and silicon nanowires by being decorated with silver nanoparticles. The resultant composite paper possesses a high through-plane thermal conductivity up to 1.80 W m−1K−1. This attributes to the fact that the silver nanoparticles efficiently links the assembled boron nitride nanosheets and silicon carbide nanowires, which results in formation of more thermally conductive pathways. This work offers a new insight into the strategies for the enhancement of thermal conductivity of polymer-based composites, for the widely identified and pursued potential applications in modern electronics.
- Published
- 2016
39. Artificial nacre-like papers based on noncovalent functionalized boron nitride nanosheets with excellent mechanical and thermally conductive properties
- Author
-
Hao Li, Xiaoliang Zeng, Ching-Ping Wong, Shuhui Yu, Lei Ye, Jianbin Xu, and Rong Sun
- Subjects
Toughness ,chemistry.chemical_compound ,Vinyl alcohol ,Thermal conductivity ,Materials science ,chemistry ,Hydrogen bond ,Boron nitride ,Ultimate tensile strength ,Nano ,Molecule ,General Materials Science ,Nanotechnology - Abstract
Inspired by the nano/microscale hierarchical structure and the precise inorganic/organic interface of natural nacre, we fabricated artificial nacre-like papers based on noncovalent functionalized boron nitride nanosheets (NF-BNNSs) and poly(vinyl alcohol) (PVA) via a vacuum-assisted self-assembly technique. The artificial nacre-like papers exhibit excellent tensile strength (125.2 MPa), on a par with that of the natural nacre, and moreover display a 30% higher toughness (2.37 MJ m(-3)) than that of the natural nacre. These excellent mechanical properties result from an ordered 'brick-and-mortar' arrangement of NF-BNNSs and PVA, in which the long-chain PVA molecules act as the bridge to link NF-BNNSs via hydrogen bonds. The resulting papers also render high thermal conductivity (6.9 W m(-1) K(-1)), and reveal their superiority as flexible substrates to support light-emitting-diode chips. The combined mechanical and thermal properties make the materials highly desirable as flexible substrates for next-generation commercial portable electronics.
- Published
- 2015
40. Characteristics of Capacitor: Fundamental Aspects
- Author
-
Tahalyani, Jitendra, Akhtar, M. Jaleel, Cherusseri, Jayesh, Kar, Kamal K., Hull, Robert, Series Editor, Jagadish, Chennupati, Series Editor, Kawazoe, Yoshiyuki, Series Editor, Kruzic, Jamie, Series Editor, Osgood, Richard M., Series Editor, Parisi, Jürgen, Series Editor, Pohl, Udo W., Series Editor, Seong, Tae-Yeon, Series Editor, Uchida, Shin-ichi, Series Editor, Wang, Zhiming M., Series Editor, and Kar, Kamal K., editor
- Published
- 2020
- Full Text
- View/download PDF
41. Tribological performance of peek with green lubricant enhanced by nano hexagonal boron nitride powder
- Author
-
Sagbas, Binnur
- Published
- 2020
- Full Text
- View/download PDF
42. Researchers' Work from Indian Institute of Technology Guwahati Focuses on Sensor Research (Flexible Paper Touchpad for Parkinson's Hand Tremor Detection)
- Subjects
Technical institutes ,Sensors ,Boron nitride ,Tremor ,Graphite ,Technology ,Editors ,Polymers ,Dimethylpolysiloxane ,Health - Abstract
2019 AUG 9 (NewsRx) -- By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators publish new report on Sensor Research. According to news reporting originating in [...]
- Published
- 2019
43. Highly thermally conductive papers with percolative layered boron nitride nanosheets
- Author
-
Fangyu Cao, Hongli Zhu, Zhiqiang Fang, Jiajun Xu, Liangbing Hu, Colin Preston, Bao Yang, Jiayu Wan, and Yuanyuan Li
- Subjects
Thermal contact conductance ,Materials science ,Nanocomposite ,General Engineering ,General Physics and Astronomy ,chemistry.chemical_element ,Dielectric ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Aluminium ,Boron nitride ,Heat transfer ,General Materials Science ,Composite material ,Nanosheet - Abstract
In this work, we report a dielectric nanocomposite paper with layered boron nitride (BN) nanosheets wired by one-dimensional (1D) nanofibrillated cellulose (NFC) that has superior thermal and mechanical properties. These nanocomposite papers are fabricated from a filtration of BN and NFC suspensions, in which NFC is used as a stabilizer to stabilize BN nanosheets. In these nanocomposite papers, two-dimensional (2D) nanosheets form a thermally conductive network, while 1D NFC provides mechanical strength. A high thermal conductivity has been achieved along the BN paper surface (up to 145.7 W/m K for 50 wt % of BN), which is an order of magnitude higher than that in randomly distributed BN nanosheet composites and is even comparable to the thermal conductivity of aluminum alloys. Such a high thermal conductivity is mainly attributed to the structural alignment within the BN nanosheet papers; the effects of the interfacial thermal contact resistance are minimized by the fact that the heat transfer is in the direction parallel to the interface between BN nanosheets and that a large contact area occurs between BN nanosheets.
- Published
- 2014
44. Boron nitride/carbon nanotube composite paper for self-activated chemiresistive detection.
- Author
-
Lim, Guh-Hwan, Bae, Seonhee, Kim, Yong-Jae, Lee, Kyu Seung, Cho, Hyunjin, Park, Young Jae, Lee, Hong-Soo, Kim, Sung-Hwan, Kim, Sooyeon, Chung, Hee-Suk, Yun, Yong Ju, Kim, Kayoung, Kim, Chulki, Seo, Jong-Su, Moon, Hi Gyu, and Son, Dong Ick
- Subjects
- *
BORON nitride , *CARBON composites , *FINITE element method , *WEARABLE technology , *DETECTION limit - Abstract
Carbon nanotube buckypaper has been considered as one of the promising candidates for chemiresistive sensor applications, especially with environmental monitoring purpose due to large surface area, device flexibility, and the broad spectrum of responsive chemical vapor molecules. However, one of typical drawbacks in carbon-based sensors is incomplete recovery to their initial state after chemical reactions with analytes, degrading sensing reproducibility. In this work, we present a thermally stable and robust boron nitride nanotube/carbon nanotube (BNCNT) hybrid paper for self-enhanced chemiresistive sensing with full reversibility. Boron nitride nanotube (BNNT) plays an essential role in long-term reliability (33 days) at the operating temperature of 200 °C. In addition, a finite-element method was applied to understand the thermal behavior of the BNCNT network structure. The BNCNT paper-based chemiresisitve sensor exhibited highly sensitive, selective, and fully reversible responses to NO 2 without external heating. Also, the sensor demonstrated the detection limit of parts per billion (ppb)-levels under strain with high reliability. With these remarkable strengths, significantly facile and cost-effective fabrication processes provide an environmental sensing platform for use in smart clothing with wearable electronics. • Boron nitride nanotube/carbon nanotube (BNCNT)-based chemiresistive sensor with full reversibility was developed. • The BNCNT paper exhibits a highly sensitive detection to NO 2 at room temperature. • The detection limit (DL) is 3.41 parts per billion (ppb) even under strained conditions with high reliability. • The BNCNT papers maintained its self-enhanced temperature of 200 °C during a long-term stability test for 33 days. • The BNNT plays a major role in the long-term reliability of maintaining a temperature of CNT networks. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
45. Design and Application of a High Temperature Infrared Cell for the Study of Polymeric Materials
- Author
-
Feairheller, W. R., Crawford, W. J., Grove, E. L., editor, and Perkins, Alfred J., editor
- Published
- 1970
- Full Text
- View/download PDF
46. Contents list.
- Subjects
COORDINATION polymers ,PHASE transitions ,BORON nitride ,OPEN access publishing ,ENVIRONMENTAL sciences ,MONOMOLECULAR films ,SCIENTIFIC community - Abstract
The document is a contents list for the journal CrystEngComm. It highlights the articles and papers featured in the current issue, including topics such as cobalt coordination polymers, environmental science, polymorphism, and lithium storage. The journal aims to advance the understanding and design of solid-state and crystalline materials. The Royal Society of Chemistry, a leading chemistry community, publishes the journal and reinvests its profits back into the chemistry community. [Extracted from the article]
- Published
- 2024
- Full Text
- View/download PDF
47. High-temperature dielectric paper with high thermal conductivity and mechanical strength by engineering the aramid nanofibers and boron nitride nanotubes.
- Author
-
Zhao, Lihua, Wei, Chengmei, Li, Zihan, Wei, Wenfu, Jia, Lichuan, Huang, Xiaolong, Ning, Wenjun, Wang, Zhong, and Ren, Junwen
- Subjects
- *
BORON nitride , *THERMAL conductivity , *MECHANICAL engineering , *NANOTUBES , *MECHANICAL engineers - Abstract
[Display omitted] • A composite paper was prepared by combining aramid nanofibers, boron nitride nanotubes, and polyethyleneimine. • Elaborating interfacial hydrogen bonds design can optimize the mechanical properties of composite paper. • The composite paper has high thermal conductivity and unique dielectric performance. Aramid paper is ubiquitous in advanced electronics and high-voltage equipment by virtue of their outstanding dielectric properties, mechanical reliability, and thermal stability. However, their limited thermal conductivity still fails to satisfy the stringent demands for heat dissipation in applications with high power and high energy density. Herein, we report a highly thermally conductive composite paper prepared by synergistically combining one-dimensional (1D) aramid nanofibers (ANFs), 1D edge-hydroxylated boron nitride nanotubes (BNNTs), and polyethyleneimine (PEI). The resultant composite paper exhibits high thermal conductivity (9.91 Wm−1K−1), low dielectric loss (<0.01), and ultrahigh electrical breakdown strength (∼334 kV/mm) with an exceptional heat resistance performance. Three-dimensional hydrogen bonding networks were constructed between the ANF framework, PEI, and BNNTs, endowing the composite paper with a superior tensile strength (up to 317 MPa) and Young's modulus (∼7.7 GPa), which are significantly higher than those of the commercial Nomex T410 paper. This research provides important insights into the design and fabrication of multifunctional insulating paper for application in modern integrated electronic and power systems. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
48. Grafting of epoxidized natural rubber chains with BN platelets to obtain flexible and thermally conductive papers.
- Author
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Wei, Qungui, Yang, Dan, Yu, Liyuan, and Zhang, Liqun
- Subjects
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THERMAL interface materials , *BLOOD platelets , *BORON nitride , *YOUNG'S modulus , *RUBBER , *THERMAL conductivity , *ELECTRONIC equipment - Abstract
Owing to the rapid development of high-power and minimized electronic devices, the materials with ultra-flexibility and effective heat dissipation have attracted much interest. Herein, the high thermally conductive epoxidized natural rubber (ENR) papers with layered structures based on boron nitride (BN) platelets are reported. First, polyrhodanine (PRd) was coated on the surface of BN platelets via oxidative polymerization of rhodanine (Rhd), which was initiated by the absorbed (S 2 O 8)2- ions. Then, BN-PRd platelets were grafted with ENR chains using a mechanochemical method due to the presence of N–C S groups in PRd, allowing the combination of PRd and ENR chains with stable covalent bonds. Moreover, the grafted ENR chains acted as bridges between adjacent BN platelets and improved the heat transfer ability of BN-PRd/ENR thermally conductive composite papers. The as-prepared ultra-flexible 30 wt% BN-PRd/ENR thermally conductive composite papers rendered high in-plane (λ ∥) and through-plane (λ ⊥) thermal conductivity of 14.57 and 0.52 W/(mK), respectively, which were correspondingly 8094% and 289% of pure ENR paper (0.18 W/(mK)). Also, Young's modulus of the 30 wt% BN-PRd/ENR thermally conductive composite paper was 25.90 MPa. Overall, the as-fabricated BN-PRd/ENR thermally conductive composite papers demonstrated high flexibility, excellent mechanical robustness, outstanding thermal conductivity, and superior electronic illustration, indicating potential applications in areas of electronic components as thermal interface materials. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
49. Hexagonal Boron Nitride Market size to increase by USD 345.2 million between 2022 to 2027, 3M Co., American Elements, BORTEK Boron Technologies and Mechatronic Inc., and more among key companies, Technavio
- Subjects
3M Co. -- International economic relations ,Brand equity ,Lubrication and lubricants ,Coatings ,Paper products industry -- International economic relations ,Boron nitride ,Motor vehicles -- Equipment and supplies ,Lubricants industry -- International economic relations ,General interest ,News, opinion and commentary - Abstract
NEW YORK: Infiniti Research, Inc. has issued the following news release: The hexagonal boron nitride market size is expected to grow by USD 345.2 million from 2022 to 2027. In [...]
- Published
- 2024
50. Dielectric and Thermal Conductivity Characteristics of Epoxy Resin-Impregnated H-BN/CNF-Modified Insulating Paper.
- Author
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Yang, Hongda, Chen, Qingguo, Wang, Xinyu, Chi, Minghe, and Zhang, Jinfeng
- Subjects
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THERMAL conductivity , *CELLULOSE fibers , *SPACE charge , *EPOXY resins , *DIELECTRICS , *BORON nitride - Abstract
High-voltage direct-current (HVDC) dry bushing capacitor-core insulation is composed of epoxy resin-impregnated insulating paper (RIP). To improve the thermal conductivity, breakdown strength, and space charge characteristics of RIP, 0.1 wt % nano-cellulose fiber (CNF)-modified RIP (CNF/RIP), 2.5–30 wt % hexagonal boron nitride (h-BN)-modified RIP (h-BN/RIP), and 2.5–30 wt % h-BN + 0.1 wt % CNF-modified RIP (h-BN + 0.1 wt % CNF/RIP) were prepared. Scanning electron microscopy (SEM) was implemented; the thermal conductivity, DC conductivity, DC breakdown strength, and space charge characteristics were tested. The maximum thermal conductivity of h-BN + 0.1 wt % CNF/RIP was 0.376 W/m.K with a h-BN content of 30 wt %. The thermal conductivity was 85.2% higher than that of unmodified RIP. The breakdown strength and charge suppression were the best in the case of 10 wt % h-BN + 0.1 wt % CNF/RIP. The maximum breakdown strength was 11.2% higher than that of unmodified RIP. These results can play a significant role in the research and development of insulation materials for HVDC dry bushing. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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