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arXiv 1407.6285cond-mat.soft
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蛋黄壳颗粒的胶体液体

Colloidal liquids of yolk-shell particles

L. E. Sanchez Diaz, E. C. Cortes-Morales, X. Li, Wei-Ren Chen, M. Medina-Noyola

摘要:

在本文中,我们开发统计力学工具来描述中间和长时间的集体和自扩散性质的液体强相互作用的空心球形粒子(壳),每个轴承一个较小的固体球(蛋黄)在其内部。为了解耦两个复杂的影响,我们假设的水动力相互作用可以通过有效的短期自扩散系数$D^0_s$和$D^0_y$,描述的短期布朗运动的蛋黄和壳颗粒,并开发一个自洽的广义Langevin方程理论来描述的中期和长期的影响的直接壳,蛋黄-壳和蛋黄-蛋黄的相互作用。在一个具体的应用中,我们考虑最简单的蛋黄-壳模型系统,涉及所有(壳和蛋黄)粒子之间的纯排斥性刚体相互作用。使用软化版本的这些粒子间的潜力,我们进行布朗动力学模拟,以确定这两种类型的颗粒的均方位移,以及中间的蛋黄壳复合物的散射函数。我们比较了它们之间的理论和模拟结果,并与相同的系统中的蛋黄的情况下的结果。我们发现,蛋黄,这对壳-壳的静态结构没有影响,影响动态性能的可预测的方式,完全捕获的理论。

英文摘要:

In this paper we develop statistical mechanical tools to describe the intermediate- and long-time collective- and self-diffusion properties of a liquid of strongly-interacting hollow spherical particles (shells), each bearing a smaller solid sphere (yolk) in its interior. To decouple two complex effects we assume that the hydrodynamic interactions can be accounted for through the effective short-time self-diffusion coefficients $D^0_s$ and $D^0_y$ that describe the short-time Brownian motion of the yolk and the shell particles, and develop a self-consistent generalized Langevin equation theory to describe the intermediate- and long-time effects of the direct shell-shell, yolk-shell and yolk-yolk interactions. In a concrete application, we consider the simplest yolk-shell model system involving purely repulsive hard-body interactions between all (shell and yolk) particles. Using a softened version of these interparticle potentials we perform Brownian dynamics simulations to determine the mean squared displacement of both types of particles, as well as the intermediate scattering function of the yolk-shell complex. We compare the theoretical and simulation results between them, and with the results for the same system in the absence of yolks. We find that the yolks, which have no effect on the shell-shell static structure, influences the dynamic properties in a predictable manner, fully captured by the theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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