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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >A geometric percolation model for non-spherical excluded volumes
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A geometric percolation model for non-spherical excluded volumes

机译：非球形排除体积的几何渗流模型

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This paper presents experimental evidence that the percolation threshold in conductor-insulator composites can be a function of the particle size ratio of the constituents, as well as the particle shape. This trend in percolation threshold is to be expected when the conducting particles are excluded from regions of the composite volume (e.g. the core of the insulator particles). The composite system investigated consisted of carbon black powder dispersed in PTFE powder. The system and the method of composite preparation was chosen specifically to promote the realization of this effect. The purpose of this experimental investigation was to provide additional confidence in a recently reported genetic algorithm-based approach to analysing the dielectric spectra of percolative composites. The experimental results are compared to a range of geometric percolation models and one such model is adapted to account for ellipsoidal insulator particles. Good agreement between model and experiment is achieved when this modification is used in conjunction with the actual particle size distribution of the insulator particles. [References: 24]
机译：本文提供了实验证据，表明导体-绝缘体复合材料的渗透阈值可以是组分粒径比以及颗粒形状的函数。当将导电颗粒从复合材料体积的区域（例如绝缘体颗粒的芯）中排除时，可以预期渗滤阈值的这种趋势。研究的复合体系由分散在PTFE粉末中的炭黑粉末组成。专门选择了复合制剂的系统和方法以促进这种效果的实现。这项实验研究的目的是在最近报道的基于遗传算法的分析渗流复合材料介电谱的方法中提供更多的信心。将实验结果与一系列几何渗滤模型进行比较，并采用一种这样的模型来解释椭圆形绝缘子颗粒。当将此修改与绝缘子颗粒的实际粒度分布结合使用时，可以在模型和实验之间达到良好的一致性。 [参考：24]

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