28 results on '"Xianzhe Wei"'
Search Results
2. Two-Dimensional Hexagonal Boron Nitride Nanosheets as Lateral Heat Spreader With High Thermal Conductivity
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Xiangdong Kong, Linhong Li, Maohua Li, Juncheng Xia, Yandong Wang, Xianzhe Wei, Shaoyang Xiong, Ping Gong, Zhongbin Pan, Xinfeng Wu, Tao Cai, Kazuhito Nishimura, Cheng-Te Lin, Nan Jiang, and Jinhong Yu
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boron nitride nanosheets ,cellulose nanofibers ,heat spreader ,filtration ,thermal conduction ,Technology - Abstract
A highly thermally conductive heat spreader for applications in electronic devices is becoming increasingly demanding, and therefore the removal of excess heat requires an efficient heat dissipating device. Boron nitride nanosheets (BNNSs) were prepared as thermally conductive fillers using hexagonal boron nitride (h-BN) powder as raw material by a water exfoliation method. A composite film was prepared by vacuum filtration using cellulose nanofibers (CNFs) as the substrate with an in-plane thermal conductivity (TC) of 82.4 W m−1 K−1, thermal conductivity enhancement increasing by 9,486% compared to pure cellulose film. Thus, CNF/BNNS composite films are promising as effective thermal interface materials (TIMs) in electronic devices and electronic component applications.
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- 2022
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3. Enhanced Thermal Conductivity of Polymer Composite by Adding Fishbone-like Silicon Carbide
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Juncheng Xia, Yue Qin, Xianzhe Wei, Linhong Li, Maohua Li, Xiangdong Kong, Shaoyang Xiong, Tao Cai, Wen Dai, Cheng-Te Lin, Nan Jiang, Shuangquan Fang, Jian Yi, and Jinhong Yu
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silicon carbide ,polyvinylidene fluoride ,thermal conductivity ,electronic packaging ,Chemistry ,QD1-999 - Abstract
The rapid development of chip technology has all put forward higher requirements for highly thermally conductive materials. In this work, a new type of material of Fishbone-like silicon carbide (SiC) material was used as the filler in a polyvinylidene fluoride (PVDF) matrix. The silicon carbide/polyvinylidene fluoride (SiC/PVDF) composites were successfully prepared with different loading by a simple mixing method. The thermal conductivity of SiC/PVDF composite reached 0.92 W m−1 K−1, which is 470% higher than that of pure polymer. The results show that using the filler with a new structure to construct thermal conductivity networks is an effective way to improve the thermal conductivity of PVDF. This work provides a new idea for the further application in the field of electronic packaging.
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- 2021
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4. Recent progress in small-molecule fluorescent probes for the detection of superoxide anion, nitric oxide, and peroxynitrite anion in biological systems.
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Yongqing Zhou, Xuan Kuang, Xiaofeng Yang, Juan Li, Xianzhe Wei, Won Jun Jang, Shan-Shan Zhang, Mei Yan, and Juyoung Yoon
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- 2024
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5. Crystallization induced realignment of carbon fibers in a phase change material to achieve exceptional thermal transportation properties
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Maohua Li, Linhong Li, Xianzhe Wei, Jinhong Yu, Yue Qin, Nan Jiang, James C. Greer, Hainam Do, Cheng-Te Lin, Xiangdong Kong, Zhongbin Pan, Tao Cai, Zhenbang Zhang, Shaoyang Xiong, and Wen Dai
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Work (thermodynamics) ,Materials science ,Renewable Energy, Sustainability and the Environment ,General Chemistry ,Thermal management of electronic devices and systems ,Phase-change material ,law.invention ,Thermal conductivity ,law ,Latent heat ,Thermal ,General Materials Science ,Crystallization ,Composite material ,Electrical conductor - Abstract
Considering the significant threat of heat to electronic equipment and the heat dissipation problems existing in powerful systems, thermal management materials are in high demand. In conjunction with the increasing desire of dissipating heat and stabilizing temperature, high thermal conductivity and phase change latent heat are attracting more attention when designing thermal management material. This work proposes a strategy to combine phase change matrix and thermally conductive filler using freeze casting. The highest thermal conductivity reaches 23.1 W m-1 K-1 accompanied by 62 J g-1 phase change latent heat. Meanwhile, replacing ice with organic phase change material in freeze casting can result in an aligned structure. This discovery will pave a novel way for introducing thermal latent heat without abandoning the aligned structure.
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- 2022
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6. Flexible MXene/copper/cellulose nanofiber heat spreader films with enhanced thermal conductivity
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Yue Qin, Linhong Li, Maohua Li, Xianzhe Wei, Shaoyang Xiong, Juncheng Xia, Xiangdong Kong, Yandong Wang, Tao Cai, Lifen Deng, Cheng-Te Lin, Kazuhito Nishimura, Jian Yi, Nan Jiang, and Jinhong Yu
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Biomaterials ,Process Chemistry and Technology ,Energy Engineering and Power Technology ,Medicine (miscellaneous) ,Surfaces, Coatings and Films ,Biotechnology - Abstract
To deal with the heat dissipation problem produced by a high integrated circuit, the preparation of heat spreaders with excellent heat transportation performance is increasing in demand. The Ti3C2 MXene sheets and copper particles were fully contacted with cellulose nanofibers by a high-speed mixer, and the composite film was prepared as a heat spreader under the action of the vacuum-assisted filtration. The MXene sheets are connected by the esterification of the carboxyl group in MXene and the hydroxyl group in cellulose nanofibers to form a chemical bond and consist of the main skeleton of the composite film. Due to the synergistic effects of MXene and copper particles, the in-plane and out-of-plane thermal conductivities of the composite film reach 24.96 and 2.46 W m−1 K−1, respectively. Compared with the pure cellulose nanofiber films, the thermal conductivity of composite films increased by 2819.2 and 187.6%, respectively. By designing two applications of composite films in the actual use process, the excellent heating conduction abilities in two directions have been proved. This measure to improve the thermal conductivities of composite films by MXene-copper binary fillers also provides ideas for the novel heat spreader.
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- 2022
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7. Robust composite film with high thermal conductivity and excellent mechanical properties by constructing a long-range ordered sandwich structure
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Linhong Li, Maohua Li, Zihui Zhang, Yue Qin, Xiaoxue Shui, Juncheng Xia, Shaoyang Xiong, Bo Wang, Zhenbang Zhang, Xianzhe Wei, Xiangdong Kong, Ping Gong, Tao Cai, Zhongbin Pan, Yong Li, Jinchen Fan, Cheng-Te Lin, Nan Jiang, and Jinhong Yu
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Renewable Energy, Sustainability and the Environment ,General Materials Science ,General Chemistry - Abstract
Simultaneous achievement of high thermal transportation performance and superior mechanical properties in a same thermal management composite film.
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- 2022
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8. 'Gingival Soft Tissue Integrative' Lithium Disilicate Glass-Ceramics with High Mechanical Properties and Sustained-Release Lithium Ions
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Zhengjie Shan, Lv Xie, Haiwen Liu, Jiamin Shi, Peisheng Zeng, Mixiao Gui, Xianzhe Wei, Zhuwei Huang, Guangqi Gao, Shijie Chen, Shoucheng Chen, and Zetao Chen
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General Materials Science - Abstract
Due to their good mechanical performances and high biocompatibility, all-ceramic materials are widely applied in clinics, especially in orthopedic and dental areas. However, the "hard" property negatively affects its integration with "soft" tissue, which greatly limits its application in soft tissue-related areas. For example, dental implant all-ceramic abutments should be well integrated with the surrounding gingival soft tissue to prevent the invasion of bacteria. Mimicking the gingival soft tissue and dentine integration progress, we applied the modified ion-exchange technology to "activate" the biological capacity of lithium disilicate glass-ceramics, via introducing OH
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- 2022
9. Outstanding Bio-Tribological Performance Induced by the Synergistic Effect of 2D Diamond Nanosheet Coating and Silk Fibroin
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Huanyi Chen, Tao Cai, Xinxin Ruan, Chengcheng Jiao, Juncheng Xia, Xianzhe Wei, Yandong Wang, Ping Gong, Hua Li, Rob Atkin, Guoqiang Yin, Xiangyang Zhou, Kazuhito Nishimura, Andreas Rosenkranz, Christian Greiner, Bo Wang, Jinhong Yu, and Nan Jiang
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Titanium ,Corrosion ,Surface Properties ,Materials Testing ,Alloys ,Water ,General Materials Science ,Diamond ,Fibroins - Abstract
Due to their excellent biocompatibility, outstanding mechanical properties, high strength-to-weight ratio, and good corrosion resistance, titanium (Ti) alloys are extensively used as implant materials in artificial joints. However, Ti alloys suffer from poor wear resistance, resulting in a considerably short lifetime. In this study, we demonstrate that the chemical self-assembly of novel two-dimensional (2D) diamond nanosheet coatings on Ti alloys combined with natural silk fibroin used as a novel lubricating fluid synergistically results in excellent friction and wear performance. Linear-reciprocating sliding tests verify that the coefficient of friction and the wear rate of the diamond nanosheet coating under silk fibroin lubrication are reduced by 54 and 98%, respectively, compared to those of the uncoated Ti alloy under water lubrication. The lubricating mechanism of the newly designed system was revealed by a detailed analysis of the involved microstructural and chemical changes. The outstanding tribological behavior was attributed to the establishment of artificial joint lubrication induced by the cross binding between the diamond nanosheets and silk fibroin. Additionally, excellent biocompatibility of the lubricating system was verified by cell viability, which altogether paves the way for the application of diamond coatings in artificial Ti joint implants.
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- 2022
10. Design and Performance of the Hotrod Melt-Tip Ice-Drilling System
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William Colgan, Christopher Shields, Paval Talalay, Xiaopeng Fan, Austin P. Lines, Joshua Elliott, Harihar Rajaram, Kenneth Mankoff, Morten Jensen, Mira Backes, Yunchen Liu, Xianzhe Wei, Nanna B. Karlsson, Henrik Spanggård, and Allan Ø. Pedersen
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We introduce the design and performance of an electrothermal ice-drilling system designed to insert a temperature sensor cable into ice. The melt tip is relatively simple and low-cost, designed for a one-way trip to the ice–bed interface. The drilling system consists of a melt tip, umbilical cable, winch, interface, power supply, and support items. The melt tip and the winch are the most novel elements of the drilling system, and we make the hardware and electrical designs of these components available open-access. Tests conducted in a laboratory indicate that the melt tip has an electrical energy to forward melting heat transfer efficiency of ∼35 % with a theoretical maximum penetration rate of ∼12 m h−1at maximum 6.0 kW power. In contrast, ice-sheet testing suggests the melt tip has an analogous heat transfer efficiency of ∼15 % with a theoretical maximum penetration rate of ∼6 m h−1. We expect the efficiency gap between laboratory and field performance to decrease with increasing operator experience. Umbilical freeze-in due to borehole refreezing is the primary depth-limiting factor of the drilling system. Enthalpy-based borehole refreezing assessments predict refreezing below critical umbilical diameter in ∼4 h at −20 ∘C ice temperatures and ∼20 h at −2 ∘C. This corresponds to a theoretical depth limit of up to ∼200 m, depending on firn thickness, ice temperature, and operator experience.
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- 2022
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11. Ultrahigh Thermal Conductivity of Epoxy Composites with Hybrid Carbon Fiber and Graphene Filler
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Maohua Li, Su Zhao, Tao Cai, Yue Qin, Nan Jiang, Linhong Li, Xianzhe Wei, Cheng-Te Lin, Guichen Song, Xiangdong Kong, Wen Dai, Zulfiqar Ali, Xiao Hou, and Jinhong Yu
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Filler (packaging) ,Materials science ,Polymers and Plastics ,Graphene ,General Chemical Engineering ,General Chemistry ,Epoxy ,law.invention ,Thermal conductivity ,law ,visual_art ,Thermal ,visual_art.visual_art_medium ,Composite material ,Electrical conductor - Abstract
With the advancement of technology, the tendency towards multifunctional and smaller size electronic devices is increasing rapidly, thus heat removal is crucially needed. Carbon fiber and graphene are the most promising materials being used as thermal conductive filler for this purpose. Herein, random carbon fiber/graphene epoxy composites (R-CF/G Ep) and vertically aligned carbon fiber/graphene epoxy composites (V-CF/G Ep) were constructed. The difference of thermal conductivity between two methods at various filler loading was investigated. With 30 wt% filler loading, the thermal conductivity of R-CF/G Ep was only 7.4 W m−1 K−1. While the V-CF/G Ep presented ultrahigh thermal conductivity of 21.19 W m−1 K−1 due to synergistic effect of carbon fiber and graphene. In this work, a promising method taking full advantage of axes thermal conductivity of CF is revealed.
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- 2021
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12. Monitoring acetylcholinesterase level changes under oxidative stress through ESIPT-ICT-based near-infrared fluorescent probe
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Xianzhe Wei, Tong Zhu, Yongsheng Ma, Jianying Sun, Gengxiu Zheng, Tingbin Ma, Xiaofeng Yang, Zhiling Song, Yanfeng Lv, Jing Zhang, and Mei Yan
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Materials Chemistry ,Metals and Alloys ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Instrumentation ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Published
- 2023
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13. Carbon nano-onions as a nanofiller for enhancing thermal conductivity of epoxy composites
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Guoqiang Yin, Xingzhong Fang, Jinhong Yu, Cheng-Te Lin, Xiangyang Zhou, Guichen Song, Su Zhao, Xiao Hou, Maohua Li, Zulfiqar Ali, Linhong Li, Wen Dai, Yue Qin, Nan Jiang, and Xianzhe Wei
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Materials science ,Materials Science (miscellaneous) ,Composite number ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Thermal conductivity ,Specific surface area ,Nano ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Composite material ,Cell Biology ,Epoxy ,021001 nanoscience & nanotechnology ,Thermal conduction ,Casting ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,chemistry ,visual_art ,visual_art.visual_art_medium ,0210 nano-technology ,Carbon ,Biotechnology - Abstract
Carbon nano-onions (CNOs) are a relatively new member in zero-dimensional carbon nanomaterials. Each constituent unit of CNOs is a multi-layer concentric spherical structure composed of multiple fullerene-like carbon spheres. CNOs are widely used for electronic components applications due to their large specific surface area and high electric conductivity. But a few works of CNOs on thermal conduction property in electronic device applications were studied. Therefore, we prepared the CNOs/epoxy composites by blending and casting method, and investigated the thermal conduction mechanism of CNOs in the epoxy matrix. The results show that the thermal conductivity of epoxy composite with 30 wt% CNOs loading reaches 0.59 W m−1 K−1 due to the formation of an effective thermal network of CNOs in epoxy resin, increasing by 320% in comparison with neat epoxy. In view of excellent thermal conduction performance, CNOs may be enable used as thermal conductive filler for the thermal management of electronic components.
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- 2021
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14. Aluminum Borate/Boron Nitride Nanosheet Fibers for Enhancing the Thermal Conductivity of Polymer Composites
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Wen Dai, Su Zhao, Zhenbang Zhang, Linhong Li, Yue Qin, Nan Jiang, Maohua Li, Xiao Hou, Jinhong Yu, Cheng-Te Lin, Guichen Song, and Xianzhe Wei
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Materials science ,chemistry.chemical_element ,Nanomaterials ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Boron nitride ,Aluminium ,General Materials Science ,Fiber ,Composite material ,Boron ,Anisotropy ,Nanosheet - Abstract
Two-dimensional nanomaterials is an intensive research area, but the anisotropy of two-dimensional nanomaterials limits its performance release and application. As a typical two-dimensional nanomat...
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- 2021
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15. Enhanced thermal transportation across an electrostatic self-assembly of black phosphorene and boron nitride nanosheets in flexible composite films
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Yandong Wang, Xianzhe Wei, Huiwu Cai, Bin Zhang, Yapeng Chen, Maohua Li, Yue Qin, Linhong Li, Xiangdong Kong, Ping Gong, Huanyi Chen, Xinxin Ruan, Chengcheng Jiao, Tao Cai, Wenying Zhou, Zhongwei Wang, Kazuhito Nishimura, Cheng-Te Lin, Nan Jiang, and Jinhong Yu
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General Materials Science - Abstract
For effective heat dissipation in portable electronics, there is a great demand for lightweight and flexible films with superior thermal transport properties. Despite extensive efforts, enhancing the intrinsic low thermal conductivity of polymers while simultaneously maintaining their flexibility is difficult to achieve due to the dilemma of quarrying appropriate filler loading. Herein, a cellulose nanofiber-based film with high in-plane thermal conductivity up to 72.53 W m
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- 2022
16. Combining Alumina Particles with Three-Dimensional Alumina Foam for High Thermally Conductive Epoxy Composites
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Xinfeng Wu, Xianzhe Wei, Hao Wang, Yong Li, Jinhong Yu, Maohua Li, Xiao Hou, Linhong Li, Cheng-Te Lin, and Nan Jiang
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Materials science ,Polymers and Plastics ,Process Chemistry and Technology ,Organic Chemistry ,Electronic packaging ,Epoxy ,Thermal expansion ,Thermal conductivity ,visual_art ,visual_art.visual_art_medium ,Polymer composites ,Ceramic ,Composite material ,Electrical conductor - Abstract
Ceramic/polymer composite with a high thermal conductivity is a candidate of insulating materials for electronic packaging. However, traditional polymer composites filled with alumina (Al2O3) powde...
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- 2020
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17. Constructing a three-dimensional nano-crystalline diamond network within polymer composites for enhanced thermal conductivity
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Shaoyang Xiong, Jian Yi, Kazuhito Nishimura, Bo Wang, Guoyong Yang, Cheng-Te Lin, Yue Qin, Nan Jiang, Tao Cai, Guichen Song, Xianzhe Wei, Linhong Li, Jinhong Yu, Maohua Li, Li Fu, and Weidong Man
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Work (thermodynamics) ,Materials science ,Composite number ,Diamond ,Epoxy ,engineering.material ,Thermal conductivity ,visual_art ,Thermal ,visual_art.visual_art_medium ,engineering ,General Materials Science ,Electronics ,Composite material ,Porosity - Abstract
In order to meet the requirement of thermal performance with the rapid development of high-performance electronic devices, constructing a three-dimensional thermal transport skeleton is an effective method for enhancing the thermal conductivity of polymer composites. In this work, a three-dimensional porous diamond framework was prepared by depositing nano-crystalline diamond on alumina foam which was impregnated with epoxy to obtain a nano-crystalline diamond@alumina foam/epoxy composite. The epoxy composite with nano-crystalline diamond@alumina foam demonstrated a thermal conductivity of 2.21 W m-1 K-1, which was increased by 1063% in comparison with pure epoxy. The thermal conductivity of the epoxy composite measured under various conditions and heat transport applications demonstrates that it possesses excellent thermal transportation and stability properties. This work provides a new idea to significantly enhance the thermal transportation properties of epoxy composites in the application of advanced packaging materials.
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- 2021
18. Enhanced Thermal Conductivity of Polymer Composite by Adding Fishbone-like Silicon Carbide
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Yue Qin, Nan Jiang, Juncheng Xia, Xianzhe Wei, Jian Yi, Shaoyang Xiong, Wen Dai, Maohua Li, Tao Cai, Shuangquan Fang, Xiangdong Kong, Jinhong Yu, Linhong Li, and Cheng-Te Lin
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chemistry.chemical_classification ,Filler (packaging) ,Materials science ,polyvinylidene fluoride ,General Chemical Engineering ,Composite number ,Mixing (process engineering) ,Electronic packaging ,electronic packaging ,Polymer ,Polyvinylidene fluoride ,Article ,chemistry.chemical_compound ,Chemistry ,Thermal conductivity ,chemistry ,silicon carbide ,Silicon carbide ,General Materials Science ,thermal conductivity ,Composite material ,QD1-999 - Abstract
The rapid development of chip technology has all put forward higher requirements for highly thermally conductive materials. In this work, a new type of material of Fishbone-like silicon carbide (SiC) material was used as the filler in a polyvinylidene fluoride (PVDF) matrix. The silicon carbide/polyvinylidene fluoride (SiC/PVDF) composites were successfully prepared with different loading by a simple mixing method. The thermal conductivity of SiC/PVDF composite reached 0.92 W m−1 K−1, which is 470% higher than that of pure polymer. The results show that using the filler with a new structure to construct thermal conductivity networks is an effective way to improve the thermal conductivity of PVDF. This work provides a new idea for the further application in the field of electronic packaging.
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- 2021
19. Simultaneous low friction and ultra-low wear enabled by a 2,5-Furandicarboxylic acid derived bio-based ionic liquid
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Xinxin Ruan, Huanyi Chen, Chengcheng Jiao, Xianzhe Wei, Yandong Wang, Ping Gong, Lexin Song, Kazuhito Nishimura, Jinhong Yu, Nan Jiang, and Tao Cai
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Mechanics of Materials ,Mechanical Engineering ,Surfaces and Interfaces ,Surfaces, Coatings and Films - Published
- 2022
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20. Epoxy composite with metal-level thermal conductivity achieved by synergistic effect inspired by lamian noodles
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Maohua Li, Linhong Li, Yapeng Chen, Yue Qin, Xianzhe Wei, Xiangdong Kong, Zhenbang Zhang, Shaoyang Xiong, Hainam Do, James C. Greer, Zhongbin Pan, Xiaoxue Shui, Tao Cai, Wen Dai, Kazuhito Nishimura, Cheng-Te Lin, Nan Jiang, and Jinhong Yu
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General Engineering ,Ceramics and Composites - Published
- 2022
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21. Enhanced thermal conductivity for polydimethylsiloxane composites with core-shell CFs@SiC filler
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Zhenbang Zhang, Meizhen Liao, Maohua Li, Linhong Li, Xianzhe Wei, Xiangdong Kong, Shaoyang Xiong, Juncheng Xia, Liqin Fu, Tao Cai, Zhongbin Pan, Haonan Li, Fei Han, Cheng-Te Lin, Kazuhito Nishimura, Nan Jiang, and Jinhong Yu
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Polymers and Plastics ,Mechanics of Materials ,Materials Chemistry ,Ceramics and Composites - Published
- 2022
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22. An enzyme-activated two-photon ratiometric fluorescent probe with lysosome targetability for imaging β-glucuronidase in colon cancer cells and tissue
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Xianzhe Wei, Juan Li, Xiaofeng Yang, Baoli Dong, Bing Geng, Zengjun Li, Xiaoxiao Hu, Biyan Ding, Jing Zhang, and Mei Yan
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Glucose ,Colonic Neoplasms ,Environmental Chemistry ,Humans ,Lysosomes ,Biochemistry ,Spectroscopy ,Analytical Chemistry ,Fluorescent Dyes ,Glucuronidase - Abstract
Colon cancer is a malignant neoplasm with high mortality that has seriously threatened human life. Accumulating evidence reveals that the β-glucuronidase (GLU), a lysosomal exoglycosidase enzyme, plays important roles in the pathological progression of colon cancer. Unfortunately, understanding the pathological roles of GLU remains a challenge due to the lack of effective detection methods for visualization the fluctuations of GLU in tissues. In this paper, based on hydrolysis function of GLU, an enzyme-activated ratiometric two-photon (TP) fluorescent probe (RN-GLU) was designed. RN-GLU was synthesized by introducing a glucopyranuronic acid methyl ester as the recognition group and 1, 8-naphthalimide as a TP fluorophore. In the presence of GLU, the trigger group was removed made an ICT process occurred induced enhancement of fluorescence ratio (I
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- 2021
23. External Fault Identification Method of High Voltage Transmission Line Based on Partial Supervision Convolutional Neural Network
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Wenbin Zhao, Xianzhe Wei, and Wu Lu
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Artificial neural network ,Computer science ,business.industry ,Deep learning ,020208 electrical & electronic engineering ,Supervised learning ,Condition monitoring ,Pattern recognition ,02 engineering and technology ,Image segmentation ,Fault (power engineering) ,Convolutional neural network ,Fault detection and isolation ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Artificial intelligence ,business - Abstract
In recent years, deep learning algorithm, i.e., artificial neural network with multiple layer structure, is increasingly being used in intelligent and automatic condition monitoring of electric power equipment, such as instant equipment classification and fault location. With optimized annotation for the image dataset and parameter tuning for the network training process, an average diagnosis accuracy higher than 85.0% and detection time within few hundred microseconds can be reached for deep learning. However, the accuracy of deep learning methods for fault detection heavily relies on the size of image dataset. In general, tens of thousands of on-site inspection images are required for the training of neural network and all the images needs to be labeled with careful annotations. This requirement makes it expensive to annotate new fault categories and has restricted instance segmentation of fault detection to less than 10 well-annotated classes. In this paper, a new partially supervised convolutional neural network, together with a novel weight transfer function, is proposed for automatic location of defects from on-site inspection images of high voltage transmission line, e.g., the identification of wildfire, mechanical invasion, tree barrier and ageing of metal fittings. With improved training paradigm, this new type of convolutional neural network allows training instance segmentation models on a large set of fault categories all of which have simple box annotation, by only a small fraction of which have complex mask annotation. These contributions reduce more than 70% workload for annotation of inspection images, and an average recognition speed of approximately 0.3s and accuracy of 93.7% for automatic segmentation and recognition of defects on transmission lines even when the fault categories is scaled to more than 10 for the same dataset.
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- 2020
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24. Constructing Tanghulu-like Diamond@Silicon carbide nanowires for enhanced thermal conductivity of polymer composite
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Jinhong Yu, Jian Yi, Xianzhe Wei, Chen Xue, Cheng-Te Lin, Xiao Hou, Guichen Song, Zhongbin Pan, Bo Wang, Chunlong Guan, Maohua Li, Yue Qin, Nan Jiang, Linhong Li, Yuefeng Du, Wen Dai, Shaoyang Xiong, and Yunxiang Lu
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Filler (packaging) ,Materials science ,Polymers and Plastics ,Nanowire ,Diamond ,Chemical vapor deposition ,engineering.material ,Thermal conduction ,Carbide ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Mechanics of Materials ,Materials Chemistry ,Ceramics and Composites ,engineering ,Silicon carbide ,Composite material - Abstract
Polymer composites with high thermal conductivity possess light weight, easy process and high chemical resistance, which has a huge demand in electronic packaging fields. Therefore, the development of new filler for improving the thermal conductivity has attracted lots of attentions in the field of polymer composites. In this work, a new hybrid filler was prepared through depositing nano-crystalline diamonds on SiC nanowires by hot filaments chemical vapor deposition . The results of SEM and TEM characterizations showed that the filler has a novel structure which is similar as a string of “sugar-coated haws on a stick” (a kind of Chinese candied fruit, named Tanghulu). Polymer composites containing the filler with the Tanghulu-like structure presented the high thermal conductivity of 0.57 W m −1 K−1 under 25 wt% filler contents. The excellent thermal conduction performance is attributed to the regional continuous networks formed by filler with the Tanghulu-like structure. Infrared images and a cooling radiator were utilized to further confirm the high thermal transportation performance of the polymer composites. The development of Tanghulu-like diamond@silicon carbide nanowires proposes a new strategy to prepare polymer composites with enhanced thermal conductivity, which will further promote the application in electronic packaging fields.
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- 2022
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25. Synergistic effect of carbon fiber and graphite on reducing thermal resistance of thermal interface materials
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Hainam Do, Maohua Li, Wen Dai, Cheng-Te Lin, Guichen Song, Zhenbang Zhang, Fei Han, Jinhong Yu, Xiao Hou, James C. Greer, Tao Cai, Xiangdong Kong, Yue Qin, Nan Jiang, Xianzhe Wei, and Linhong Li
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Materials science ,Thermal resistance ,General Engineering ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Thermal conduction ,01 natural sciences ,0104 chemical sciences ,Thermal conductivity measurement ,Thermal conductivity ,Operating temperature ,Thermal ,Ceramics and Composites ,Surface roughness ,Graphite ,Composite material ,0210 nano-technology - Abstract
Thermal interface materials (TIM) have become a leading solution to achieve lower operating temperature in electronic devices. To improve thermal conductivity and to simultaneously reduce thermal resistance, this work investigates the thermal properties for interface materials with carbon fiber and graphite. When the ratio between carbon fiber to graphite is 1:1, the thermal resistance can be reduced to 1.8 × 10−4 K m2 W−1 at 30 psi, although the bulk thermal conductivity is lowered from 34 to 19 W m−1 K−1. The synergistic effect between carbon fiber and graphite is investigated. Surface roughness of TIMs was measured and two different types of thermal conductivity measurement were applied to demonstrate that graphite makes a contribution to bulk thermal conductivity where a CF played an important role for smoothing the surface, thereby lowering the thermal resistance. In real applications, the hybrid filler is shown to perform better in enhancing the heat conduction for electrical packaging.
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- 2021
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26. Stress induced carbon fiber orientation for enhanced thermal conductivity of epoxy composites
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Zulfiqar Ali, Xiao Hou, Jinhong Yu, Linhong Li, Xianzhe Wei, Maohua Li, Hainam Do, Cheng-Te Lin, Guichen Song, Nan Jiang, Zhongbin Pan, and James C. Greer
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Materials science ,Scanning electron microscope ,Mechanical Engineering ,Stress induced ,02 engineering and technology ,Epoxy ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,Stress field ,Stress (mechanics) ,Thermal conductivity ,Mechanics of Materials ,visual_art ,Thermal ,Ceramics and Composites ,visual_art.visual_art_medium ,Composite material ,0210 nano-technology ,Electrical conductor - Abstract
Polymer composites that have high thermal conductivity have become one of the most promising solutions needed to satisfy the thermal management requirements for high-power electrical and electronic equipment. In this work, a strategy relying on aligning carbon fibers through the application of a stress field is proposed. Ultrahigh through-plane thermal conductive epoxy composites with carbon fiber networks have been prepared by in-situ solidification within an epoxy. The thermal conductivity of these epoxy composites reaches as high as 32.6 W m−1 K−1 at 46 wt percent (wt%) of carbon fibers, which is about 171 times that of the pure epoxy. The alignment condition for the carbon fibers for a carbon fiber composite in which stress has been applied and a blended carbon fiber composite are compared using micro compute tomography (micro-CT) and scanning electron microscopy (SEM). These epoxy composites display attractive thermal properties and provide a practical route to satisfy the thermal dissipation requirements raised by the development of modern electrical devices and systems.
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- 2021
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27. Improving thermal conductivity of poly(vinyl alcohol) composites by using functionalized nanodiamond
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Shulin Song, Zulfiqar Ali, Linhong Li, Jinhong Yu, Xianzhe Wei, Maohua Li, Hao Wang, Cheng-Te Lin, Guichen Song, Yuming Wu, Yue Qin, Nan Jiang, and Jian Yi
- Subjects
Filler (packaging) ,Vinyl alcohol ,Materials science ,Polymers and Plastics ,Composite number ,02 engineering and technology ,Thermal management of electronic devices and systems ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Conductive polymer composite ,chemistry.chemical_compound ,Thermal conductivity ,chemistry ,Mechanics of Materials ,Thermal ,Materials Chemistry ,Ceramics and Composites ,Composite material ,0210 nano-technology ,Nanodiamond - Abstract
Highly thermally conductive polymer composites with over 10 W m−1 K−1 are widely pursued in the commercial field. Unfortunately, the polymer composites with high thermal conductivity are few reported using simple and scalable methods to meet the commercial demands. Therefore, herein highly thermal conductive polymer composites consisting of hydroxyl-rich nanodiamonds (ND-OH) and poly(vinyl alcohol) (PVA) are reported, which exhibits the interfacial properties of composite is closely related to its thermal conductivity. It proves that interface strength between matrix and filler would dominate the thermal conductivity of composite at a relatively low content. While the thermal conductivity would be dominated by the filler-filler interaction at high loadings. The ultrahigh thermal conductivity of the PVA/ND-OH composite is 18.98 W m−1 K−1 when ND-OH reach at 90 wt%. The polymer composites present the excellent thermal conductivity and show a potential application for thermal management of the next-generation electronic products.
- Published
- 2021
- Full Text
- View/download PDF
28. Thermal and corrosion behavior of Ti3C2/Copper composites
- Author
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Zhiduo Liu, Qihuang Deng, Zhongbin Pan, Li Fu, Shulin Song, Nan Jiang, Chen Ye, Dan Dai, Li Wei, Cheng-Te Lin, Guichen Song, Jinhong Yu, Bo Wang, and Xianzhe Wei
- Subjects
Materials science ,Polymers and Plastics ,Contact resistance ,Composite number ,chemistry.chemical_element ,Spark plasma sintering ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,0104 chemical sciences ,Corrosion ,Thermal conductivity ,chemistry ,Electrical resistance and conductance ,Mechanics of Materials ,Materials Chemistry ,Ceramics and Composites ,Composite material ,0210 nano-technology ,MXenes - Abstract
In virtue of its excellent performance and abundant surface terminations, MXenes, a newly emerged 2D materials, greatly exhibit promising applications in many fields of energy storage and electromagnetic shielding. Ti3C2, a member of MXenes, is widely investigated in recent years. However, lack for attention in thermal property and corrosion behavior. Here, Copper matrix composites were prepared by Spark Plasma Sintering, in which TiC and few-layer Ti3C2 nanosheets as filler. The results exhibit corrosion resistance of the Ti3C2/Cu composites were improved compared to TiC/Cu composites, benefiting from outstanding electrical conductivity and easily oxidized property of Ti3C2. However, the thermal conductivity of Ti3C2/Cu composite with the content of 2 wt% Ti3C2 improves about 15% compared to TiC/Cu composites with same content, resulting from the low inherent thermal conductivity of filler and lattice mismatch between copper and filler. Moreover, the electrical resistance of Ti3C2/Cu composites increases about 100% with the content of 2 wt% Ti3C2 at interfacial contact resistance measurement compared with pure Cu. Meanwhile, the anti-corrosion performance of the Ti3C2/Cu composites was improved over pure Cu. This work will broaden appliance field of Ti3C2 and lay the foundation for the future research.
- Published
- 2020
- Full Text
- View/download PDF
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