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学者姓名:成永红

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Dielectric properties and thermal conductivity of epoxy composites using core/shell structured Si/SiO2/Polydopamine EI SCIE Scopus
期刊论文 | 2018 , 140 , 83-90 | COMPOSITES PART B-ENGINEERING
WoS CC Cited Count: 4
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Abstract :

We report the fabrication of epoxy-based composites using well-designed core/shell Si/SiO2 (denoted as Si*) and core/shell/shell structured Si/SiO2/Polydopamine (denoted as Si*@PDA) particles as fillers, which exhibit improved dielectric properties and thermal conductivity. Using the core-shell Si* and Si*@PDA particles as fillers in the epoxy-based composites, the dielectric loss tangent is remarkably suppressed and the volume resistivity is apparently enhanced, as compared with that using raw Si particles as fillers. Moreover, the Si*@PDA composites have higher dielectric constant and lower loss tangent. For instance, the dielectric constant of Si*@PDA/epoxy composite with 33.8 vol% filler content is up to 19.8 at room temperature at 100 Hz, which is nearly 5.3 times of that of the pure epoxy polymer (3.4), while its loss tangent is only 0.085. Additionally, the core-shell particle based composites still possess a high thermal conductivity.

Keyword :

Core-shell Thermal conductivity Epoxy composites Si/SiO2/Polydopamine Dielectric properties

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GB/T 7714 Wang, Zhengdong , Cheng, Yonghong , Yang, Mengmeng et al. Dielectric properties and thermal conductivity of epoxy composites using core/shell structured Si/SiO2/Polydopamine [J]. | COMPOSITES PART B-ENGINEERING , 2018 , 140 : 83-90 .
MLA Wang, Zhengdong et al. "Dielectric properties and thermal conductivity of epoxy composites using core/shell structured Si/SiO2/Polydopamine" . | COMPOSITES PART B-ENGINEERING 140 (2018) : 83-90 .
APA Wang, Zhengdong , Cheng, Yonghong , Yang, Mengmeng , Huang, Jialiang , Cao, Daxian , Chen, Siyu et al. Dielectric properties and thermal conductivity of epoxy composites using core/shell structured Si/SiO2/Polydopamine . | COMPOSITES PART B-ENGINEERING , 2018 , 140 , 83-90 .
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Influence of pulse front steepness on vacuum flashover characteristics EI SCIE Scopus
期刊论文 | 2018 , 448 , 261-269 | APPLIED SURFACE SCIENCE
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Studying flashover characteristics in vacuum environment is extremely significant for designing reliable insulation structures. The waveform of applied voltage excitations greatly affects the flashover process. In this study, the influence of nanosecond pulse front steepness on flashover process in vacuum is investigated. Firstly, flashover experiments with nanosecond pulses are conducted. Nanosecond pulses with different front steepness are generated and used to trigger flashovers on sample surface. The relationship between pulse front steepness and flashover voltage is studied. Meanwhile, a particle-in-cell with Monte Carlo collision (PIC-MCC) two-dimensional self-sustaining discharge model based on secondary electron emission avalanche (SEEA) scheme is established. The distribution of charged particles, electric field and their evolution during flashover process are presented. Furthermore, pulses with various rising steepness are applied to the model. The multiplication and propagation of charged particles in different pulse waveform conditions are studied. In all conditions, two stages during flashover process can be obviously distinguished based on charged particle number evolution which divides the overall flashover delay time into two parts. By analyzing the voltage development in these two time slots, the quasi-linear relationship between pulse front steepness and flashover voltage in nanosecond pulse flashover in vacuum is explained. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Surface flashover Pulse front steepness Plasma discharge Surface insulation Nanosecond pulse Particle-in-cell(PIC) method

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GB/T 7714 Mao, Jiale , Wang, Shuang , Cheng, Yonghong et al. Influence of pulse front steepness on vacuum flashover characteristics [J]. | APPLIED SURFACE SCIENCE , 2018 , 448 : 261-269 .
MLA Mao, Jiale et al. "Influence of pulse front steepness on vacuum flashover characteristics" . | APPLIED SURFACE SCIENCE 448 (2018) : 261-269 .
APA Mao, Jiale , Wang, Shuang , Cheng, Yonghong , Wu, Jingshen . Influence of pulse front steepness on vacuum flashover characteristics . | APPLIED SURFACE SCIENCE , 2018 , 448 , 261-269 .
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Alignment of Boron Nitride Nanofibers in Epoxy Composite Films for Thermal Conductivity and Dielectric Breakdown Strength Improvement SCIE PubMed Scopus
期刊论文 | 2018 , 8 (4) | NANOMATERIALS
WoS CC Cited Count: 4 SCOPUS Cited Count: 7
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Abstract :

Development of polymer-based composites with simultaneously high thermal conductivity and breakdown strength has attracted considerable attention owing to their important applications in both electronic and electric industries. In this work, boron nitride (BN) nanofibers (BNNF) are successfully prepared as fillers, which are used for epoxy composites. In addition, the BNNF in epoxy composites are aligned by using a film casting method. The composites show enhanced thermal conductivity and dielectric breakdown strength. For instance, after doping with BNNF of 2 wt%, the thermal conductivity of composites increased by 36.4% in comparison with that of the epoxy matrix. Meanwhile, the breakdown strength of the composite with 1 wt 70 BNNF is 122.9 kV/mm, which increased by 6.8% more than that of neat epoxy (115.1 kV/mm). Moreover, the composites have maintained a low dielectric constant and alternating current conductivity among the range of full frequency, and show a higher thermal decomposition temperature and glass-transition temperature. The composites with aligning BNNF have wide application prospects in electronic packaging material and printed circuit boards.

Keyword :

thermal and dielectric properties electrospinning technique alignment BN nanofibers epoxy composite

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GB/T 7714 Wang, Zhengdong , Liu, Jingya , Cheng, Yonghong et al. Alignment of Boron Nitride Nanofibers in Epoxy Composite Films for Thermal Conductivity and Dielectric Breakdown Strength Improvement [J]. | NANOMATERIALS , 2018 , 8 (4) .
MLA Wang, Zhengdong et al. "Alignment of Boron Nitride Nanofibers in Epoxy Composite Films for Thermal Conductivity and Dielectric Breakdown Strength Improvement" . | NANOMATERIALS 8 . 4 (2018) .
APA Wang, Zhengdong , Liu, Jingya , Cheng, Yonghong , Chen, Siyu , Yang, Mengmeng , Huang, Jialiang et al. Alignment of Boron Nitride Nanofibers in Epoxy Composite Films for Thermal Conductivity and Dielectric Breakdown Strength Improvement . | NANOMATERIALS , 2018 , 8 (4) .
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Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

Paschen's curve which is based on Townsend effects has been used to describe the gas breakdown voltage until more and more experiments has shown that it is not entirely accurate in describing breakdown when the electrode gaps less than 10 mu m. Thus it is of great significance to study the microscale gaps breakdown law and the discharge mechanism of insulation structure in micro-electronic components. In this work, numerical experiments using the particle-in-cell/Monte Carlo collisions method are used to simulate the process of microgap discharge in the air. The variation of the number of charged particles, the current intensity and the electric field distribution are taken as the criteria of breakdown to analyze the breakdown characteristics in microgaps and the points of time determined by different criteria are basically the same. Furthermore, field emission and thermionic emission have different contributions to the entire electron emission from the cathode under different applied voltages and cathode temperatures. The series of experimental results can provide further theoretical guidance for the physical mechanism of microscale dielectric breakdown.

Keyword :

Particle-in-cell method microscale gaps gas breakdown electron emission

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GB/T 7714 Gao, Xinyu , Meng, Guodong , Wang, Kejing et al. Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method [C] . 2018 .
MLA Gao, Xinyu et al. "Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method" . (2018) .
APA Gao, Xinyu , Meng, Guodong , Wang, Kejing , Zhang, Dujiao , Dong, Chengye , Li, Nan et al. Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method . (2018) .
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Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite EI SCIE
期刊论文 | 2018 , 27 (11) | CHINESE PHYSICS B
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Abstract :

Epoxy-based composites containing montmorillonite (MMT) modified by silylation reaction with gamma-aminopropyltriethoxysilane (gamma-APTES) and 3-(glycidyloxypropyl) trimethoxysilane (GPTMS) are successfully prepared. The effects of filler loading and surface modification on the electrical and thermal properties of the epoxy/MMT composites are investigated. Compared with the pure epoxy resin, the epoxy/MMT composite, whether MMT is surface-treated or not, shows low dielectric permittivity, low dielectric loss, and enhanced dielectric strength. The MMT in the epoxy/MMT composite also influences the thermal properties of the composite by improving the thermal conductivity and stability. Surface functionalization of MMT not only conduces to the better dispersion of the nanoparticles, but also significantly affects the electric and thermal properties of the hybrid by influencing the interfaces between MMT and epoxy resin. Improved interfaces are good for enhancing the electric and thermal properties of nanocomposites. What is more, the MMT modified with GPTMS rather than gamma-APTES is found to have greater influence on improving the interface between the MMT filler and polymer matrices, thus resulting in lower dielectric loss, lower electric conductivity, higher breakdown strength, lower thermal conductivity, and higher thermal stability.

Keyword :

thermal property modified epoxy resin electric property surface modification

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GB/T 7714 Jia, Zi-Rui , Gao, Zhen-Guo , Lan, Di et al. Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite [J]. | CHINESE PHYSICS B , 2018 , 27 (11) .
MLA Jia, Zi-Rui et al. "Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite" . | CHINESE PHYSICS B 27 . 11 (2018) .
APA Jia, Zi-Rui , Gao, Zhen-Guo , Lan, Di , Cheng, Yong-Hong , Wu, Guang-Lei , Wu, Hong-Jing . Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite . | CHINESE PHYSICS B , 2018 , 27 (11) .
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Sandwiched epoxy-alumina composites with synergistically enhanced thermal conductivity and breakdown strength EI SCIE Scopus
期刊论文 | 2017 , 52 (8) , 4299-4308 | JOURNAL OF MATERIALS SCIENCE | IF: 2.993
WoS CC Cited Count: 10
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Development of polymer-based composites with simultaneously high thermal conductivity and breakdown strength has attracted considerable attentions owing to their important applications in both electronic and electric industries. In this study, we successfully design novel epoxy-based composites with nano-Al2O3/epoxy composite layer sandwiched between micro-Al2O3/epoxy composite layers, which show synergistically and significantly enhanced thermal conductivity and breakdown strength. Compared with the traditional composites, the bottleneck that both thermal conductivity and breakdown strength cannot be simultaneously enhanced can be overcome successfully. An optimized sandwiched alumina-epoxy composite with 70 wt% micro-Al2O3 fillers in the outer layers and 3 wt% nano-Al2O3 in the middle layer simultaneously displays a high thermal conductivity of 0.447 W m(-1) K-1 (2.4 times of that of epoxy) and a high breakdown strength of 68.50 kV mm(-1), which is 6.3 % higher than that of neat epoxy (64.45 kV mm(-1)). The experimental results on the thermal conductivity of multi-layered alumina-epoxy composites were in well accordance with the theoretical values predicted from the series conduction model. This novel technique simultaneously improves thermal conductivity and breakdown strength, which is of critical importance for design of perspective composites for electronic and electric equipments.

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GB/T 7714 Wang, Zhengdong , Cheng, Yonghong , Wang, Hongkang et al. Sandwiched epoxy-alumina composites with synergistically enhanced thermal conductivity and breakdown strength [J]. | JOURNAL OF MATERIALS SCIENCE , 2017 , 52 (8) : 4299-4308 .
MLA Wang, Zhengdong et al. "Sandwiched epoxy-alumina composites with synergistically enhanced thermal conductivity and breakdown strength" . | JOURNAL OF MATERIALS SCIENCE 52 . 8 (2017) : 4299-4308 .
APA Wang, Zhengdong , Cheng, Yonghong , Wang, Hongkang , Yang, Mengmeng , Shao, Yingyu , Chen, Xin et al. Sandwiched epoxy-alumina composites with synergistically enhanced thermal conductivity and breakdown strength . | JOURNAL OF MATERIALS SCIENCE , 2017 , 52 (8) , 4299-4308 .
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In-situ Observation of Electrophoresis of Conductive and Semi-conductive Micro Particles in Epoxy Resin EI CPCI-S Scopus
会议论文 | 2017 , 349-352 | 1st International Conference on Electrical Materials and Power Equipment (ICEMPE)
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Abstract :

Electrophoresis phenomena of conductive and semi conductive micro particles in liquid epoxy/anhydride mixture were in-situ observed by optical microscopy. The polymer mold with plate electrodes which provide horizontal electric field was made for the observation. Graphite, copper and titanium dioxide micro particles were studied in this paper. Because of the existence of space charge, micro particles moved together with liquid epoxy towards electrode under DC electric field. The aggregation and alignment of particles were studied and the theoretical analysis was given. The study shows that the viscosity of epoxy decides the flow type and laminar flow is ideal for the formation of alignment structure, indicating that the suitable moment of applying electric field is the key to produce the high temperature curing epoxy with anisotropic properties. This work shows that the radius, density and shape of particles also affect the alignment under electric field.

Keyword :

electrophoresis in-situ alignment epoxy anhydride

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GB/T 7714 Chen, Siyu , Wang, Zhengdong , Yang, Mengmeng et al. In-situ Observation of Electrophoresis of Conductive and Semi-conductive Micro Particles in Epoxy Resin [C] . 2017 : 349-352 .
MLA Chen, Siyu et al. "In-situ Observation of Electrophoresis of Conductive and Semi-conductive Micro Particles in Epoxy Resin" . (2017) : 349-352 .
APA Chen, Siyu , Wang, Zhengdong , Yang, Mengmeng , Xie, Qian , Liu, Jingya , Mao, Jiale et al. In-situ Observation of Electrophoresis of Conductive and Semi-conductive Micro Particles in Epoxy Resin . (2017) : 349-352 .
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In-situ Observation of Electric Field Assisted Alignment of Titanium Dioxide Nanowires in Epoxy Resin EI CPCI-S Scopus
会议论文 | 2017 , 449-452 | IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP)
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This work investigates the alignment of titania nanowires in uncured liquid epoxy by electric field. Epoxy added by anhydride and amine hardeners were studied separately. Purchased titania nanowires which contained sodium titanium oxide and synthesized titania nanowires with anatase crystal were both studied. This work shows that the alignment structure of purchased nanowires can be achieved in both anhydride/epoxy and amine/epoxy system at different temperature. The detailed process of alignment was observed. To achieve the desirable alignment structure in epoxy resin, the study finds that the condition and procedure of alignment should be modified according to the variety of hardeners and nanowires. The different alignment ability of two kinds of nanowires in epoxy were discussed theoretically. This work gives a reference to the fabrication of epoxy composites with anisotropic properties and has the potential to strengthen the electrical performance of epoxy in desired direction.

Keyword :

nanowire alignment TiO2 epoxy Polymer

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GB/T 7714 Chen, Siyu , Xie, Qian , Wang, Zhengdong et al. In-situ Observation of Electric Field Assisted Alignment of Titanium Dioxide Nanowires in Epoxy Resin [C] . 2017 : 449-452 .
MLA Chen, Siyu et al. "In-situ Observation of Electric Field Assisted Alignment of Titanium Dioxide Nanowires in Epoxy Resin" . (2017) : 449-452 .
APA Chen, Siyu , Xie, Qian , Wang, Zhengdong , Yang, Mengmeng , Liu, Jingya , Mao, Jiale et al. In-situ Observation of Electric Field Assisted Alignment of Titanium Dioxide Nanowires in Epoxy Resin . (2017) : 449-452 .
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Dielectric and thermal properties of epoxy resins with TiO2 nanowires EI SCIE Scopus
期刊论文 | 2017 , 28 (23) , 17871-17880 | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | IF: 2.324
WoS CC Cited Count: 5 SCOPUS Cited Count: 7
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Abstract :

Epoxy based composites with reinforced dielectric properties were successfully synthesized by using TiO2 nanowires as inorganic filler. TiO2 nanoparticle/epoxy composites were also prepared as a contrast. TiO2 nanowires were synthesized by a hydrothermal method, with an average diameter of 50 nm and a length of 5 mu m. TiO2 nanoparticles were purchased with average diameter of similar to 60 nm. Scanning electron microscopy images show that two types of fillers are both homogeneously dispersed in the matrix. Although the specific surface area of TiO2 nanoparticles is about twice of that of TiO2 nanowires, remarkable improved dielectric constant, enhanced electrical and thermal conductivity, higher space charge accumulation and stronger charge carrier mobility were observed in nanowire filled epoxy resin at the same filler content. Meanwhile, nanowires composites exhibit excellent glass transition temperature and thermal stability. These results indicated that the geometry of filler had a profound impact on the performance of epoxy composites, and nanowire filling is more effective than nanoparticle filling to enhance the properties of epoxy resin.

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GB/T 7714 Xie, Qian , Cheng, Yonghong , Chen, Siyu et al. Dielectric and thermal properties of epoxy resins with TiO2 nanowires [J]. | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2017 , 28 (23) : 17871-17880 .
MLA Xie, Qian et al. "Dielectric and thermal properties of epoxy resins with TiO2 nanowires" . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 28 . 23 (2017) : 17871-17880 .
APA Xie, Qian , Cheng, Yonghong , Chen, Siyu , Wu, Guanglei , Wang, Zhengdong , Jia, Zirui . Dielectric and thermal properties of epoxy resins with TiO2 nanowires . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2017 , 28 (23) , 17871-17880 .
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Epoxy/h-BN Composites Based on Oriented. Boron Nitride Platelets With High Thermally Conductivity for Electronic Encapsulation EI CPCI-S Scopus
会议论文 | 2017 | IEEE International Workshop on Integrated Power Packaging (IWIPP)
SCOPUS Cited Count: 1
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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. The high thermal conductivity of boron nitride (BN) platelets is expected to endow polymer composites with high thermal conductivity. Whilst BN is a typical two dimensional materials, which has anisotropic thermal conductivity. We have reported an remarkably increase in the in-plane thermal conductivity of the BN/epoxy composites through the fabrication of the horizontally aligned and densely packed BN in the epoxy matrix via a vacuum-assisted self-assembly technique. In addition, we compared the influence of the different BN particle sizes on the thermal conductivity of the composites. In this study, the range of BN particles sizes used are 5-8 mu m, 15-20 mu m and 25-30 mu m, respectively. The results indicated that the BN with lager size in matrix renders the composites high thermal conductivity at same content. The larger BN platelets can more easily form conductive chains of filler compared to the smaller filler particles. Meanwhile, the smaller filler particle can more easily scatter phonons suppressing heat transfer. It is clear that epoxy with aligned BN platelets has great promising for high thermal conductive insulating materials for the power microelectronics integrated in packaging.

Keyword :

Electronic Encapsulation thermal conductivity hexagonal boron nitride platelets alignment epoxy composite

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GB/T 7714 Wang, Zhengdong , Huang, Jialiang , Chen, Siyu et al. Epoxy/h-BN Composites Based on Oriented. Boron Nitride Platelets With High Thermally Conductivity for Electronic Encapsulation [C] . 2017 .
MLA Wang, Zhengdong et al. "Epoxy/h-BN Composites Based on Oriented. Boron Nitride Platelets With High Thermally Conductivity for Electronic Encapsulation" . (2017) .
APA Wang, Zhengdong , Huang, Jialiang , Chen, Siyu , Yang, Mengmeng , Liu, Jingya , Xie, Qian et al. Epoxy/h-BN Composites Based on Oriented. Boron Nitride Platelets With High Thermally Conductivity for Electronic Encapsulation . (2017) .
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