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arXiv 0810.3153cond-mat.dis-nncond-mat.stat-mech
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无序分离复合材料的最优渗流

Optimal Percolation of Disordered Segregated Composites

N. Johner, C. Grimaldi, T. Maeder, P. Ryser

摘要:

我们评估的渗流阈值的连续分离系统,随机球形夹杂物的一个现实的模型,禁止deletating对象,模型化的硬核球形颗粒周围的可穿透的壳,占据大区域内的复合材料。我们发现,渗流阈值一般是一个非单调的函数的隔离,和一个最佳的(即。例如,最小)临界浓度在达到最大偏析之前存在。我们解释这一功能起源于减少可用的体积效应和增强的浓度之间的竞争,以确保在高度隔离制度的渗滤。与现有的隔离材料的相关性进行了讨论。

英文摘要:

We evaluate the percolation threshold values for a realistic model of continuum segregated systems, where random spherical inclusions forbid the percolating objects, modellized by hard-core spherical particles surrounded by penetrable shells, to occupy large regions inside the composite. We find that the percolation threshold is generally a non-monotonous function of segregation, and that an optimal (i. e., minimum) critical concentration exists well before maximum segregation is reached. We interpret this feature as originating from a competition between reduced available volume effects and enhanced concentrations needed to ensure percolation in the highly segregated regime. The relevance with existing segregated materials is discussed.

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