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arXiv 0707.4071cond-mat.softcond-mat.dis-nn
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吸引胶体的动力学不均匀性

Dynamic heterogeneities in attractive colloids

A. Fierro, E. Del Gado, A. de Candia, A. Coniglio

摘要:

我们研究了形成的胶体凝胶的分子动力学模拟的胶体悬浮液模型的装置。在低温和低体积分数下观察到具有凝胶状特征的减缓,这是由于形成了持久性结构。我们发现,在低体积分数的动态磁化率,描述动态的异质性,表现出一个大的高原,主要由集群的长寿债券。在较高的体积分数下,当颗粒的拥挤效应开始出现时,它向以峰值为特征的状态过渡。我们引入了一个合适的平均集群大小的集群的单体连接的“持久”键,很好地描述了动态的敏感性。

英文摘要:

We study the formation of a colloidal gel by means of Molecular Dynamics simulations of a model for colloidal suspensions. A slowing down with gel-like features is observed at low temperatures and low volume fractions, due to the formation of persistent structures. We show that at low volume fraction the dynamic susceptibility, which describes dynamic heterogeneities, exhibits a large plateau, dominated by clusters of long living bonds. At higher volume fraction, where the effect of the crowding of the particles starts to be present, it crosses over towards a regime characterized by a peak. We introduce a suitable mean cluster size of clusters of monomers connected by "persistent" bonds which well describes the dynamic susceptibility.

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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