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arXiv 1202.6264cond-mat.softcond-mat.stat-mechphysics.chem-ph
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具有化学信号的活性胶体悬浮液中的动态聚簇

Dynamic clustering in active colloidal suspensions with chemical signaling

I. Theurkauff, C. Cottin-Bizonne, J. Palacci, C. Ybert, L. Bocquet

摘要:

在本文中,我们实验研究了自推进胶体的致密活性悬浮体的相行为。除了观察到的固体状和气体状相的高密度和低密度,一种新的簇相的报告在中间密度。这是一种致密聚集体的静止集合体,其平均尺寸随着活动而增长,作为自推进速度的线性函数。虽然可以考虑不同的可能的dupi来解释这些观察结果-例如最近提出的通用速度减弱不稳定性-,我们表明,实验结果是由一个趋化聚集机制,最初引入考虑细菌聚集,并在这里考虑胶体游泳者之间的扩散泳化学相互作用。

英文摘要:

In this paper, we explore experimentally the phase behavior of a dense active suspension of self- propelled colloids. In addition to a solid-like and a gas-like phase observed for high and low densities, a novel cluster phase is reported at intermediate densities. This takes the form of a stationary assembly of dense aggregates, with an average size which grows with activity as a linear function of the self-propelling velocity. While different possible scenarii can be considered to account for these observations - such as a generic velocity weakening instability recently put forward -, we show that the experimental results are reproduced by a chemotactic aggregation mechanism, originally introduced to account for bacterial aggregation, and accounting here for diffusiophoretic chemical interaction between colloidal swimmers.

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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