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首页> 外文期刊>Journal of Applied Physics >Effect of interparticle electrostatic interactions on the dielectric response of 0-3 connectivity particle/polymer composites for high energy density storage
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Effect of interparticle electrostatic interactions on the dielectric response of 0-3 connectivity particle/polymer composites for high energy density storage

机译：晶体静电相互作用对高能密度储存0-3连接粒子/聚合物复合材料介电响应的影响

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摘要

Polymer composites with high energy density have been of great interest to scientists for a long time, and this accounts for a great wealth of experimental data that are available for interpretation. One of the important phenomena is the variation rate of the permittivity of composites, which always deviates from the linear increase and rises steeply toward the high concentration. Interestingly, the critical transition concentration is always located in the range of 20 vol. %-25 vol. %, but still far less than the common percolation threshold of composites. Through the analysis of the local electric field distribution and surface polarized charges distribution, the phenomenon is successfully interpreted as the effect of the electrostatic interactions between the adjacent polarized particles. Two specified composite configurations (BCC and FCC) are designed, and their dielectric properties have been systematically studied with the help of the finite element method and the phase field method. The simulation results indicate that the strength of the particles' interaction is short-range effective and depends closely on the gap distance between adjacent particles. When the gap distance is smaller than 0.8 times the radius of the particles, which is tantamount to the concentration larger than 20 vol. % and 25 vol. % for BCC and FCC, respectively, the electrostatic interaction of the particles is rather significant, resulting in an additional contribution on the variation of the dielectric properties of composites and vice versa. The synchronous variation tendency between the simulation results and experimental measurements demonstrates the effect of electrostatic interaction on the dielectric properties of composites.
机译：高能量密度的聚合物复合材料很长一段时间对科学家们非常感兴趣，这占据了可用于解释的大量实验数据。重要的现象之一是复合材料介电常数的变化率，其总是偏离线性的增加，并急于高浓度上升。有趣的是，临界过渡浓度始终位于20体积的范围内。 ％-25卷。 ％，但仍然远小于复合材料的常见渗透阈值。通过对局部电场分布和表面偏振电荷分布的分析，现象被成功地解释为相邻偏振颗粒之间的静电相互作用的效果。设计了两种指定的复合配置（BCC和FCC），并在有限元方法和相场方法的帮助下系统地研究了它们的电介质特性。仿真结果表明，颗粒相互作用的强度是短范围的有效性，并且依赖于相邻颗粒之间的间隙距离。当间隙距离小于颗粒半径的0.8倍时，其与大于20体积大于20体积的浓度。 ％和25卷。对于BCC和FCC的％，颗粒的静电相互作用相当显着，导致对复合材料的电介质性质的变化的额外贡献，反之亦然。模拟结果和实验测量之间的同步变化趋势表明静电相互作用对复合材料的电介质性质的影响。

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  • 来源
    《Journal of Applied Physics》 |2020年第18期|184106.1-184106.10|共10页
  • 作者

    Shao-Long Zhong; Ziming Cai; Jun-Wei Zha; Yu Zhao; Zhi-Min Dang;

  • 作者单位

    State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 People's Republic of China;

    State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China;

    State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 People's Republic of China School of Chemistry and Biological Engineering University of Science and Technology Beijing Beijing 100083 People's Republic of China;

    Center on Frontier Technologies for Advanced Power Transmission and Distribution Equipment School of Electrical Engineering Zhengzhou University Henan 450001 People's Republic of China;

    State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 People's Republic of China Center on Frontier Technologies for Advanced Power Transmission and Distribution Equipment School of Electrical Engineering Zhengzhou University Henan 450001 People's Republic of China;

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