Dynamic clustering and re-dispersion in concentrated colloid-active gel composites.

Dynamic clustering and re-dispersion in concentrated colloid-active gel composites.
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浓缩胶体活性凝胶复合材料中的动态聚集和再分散。

DOI:
10.1039/c9sm01249d
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发表时间:
2019
期刊:
影响因子:
3.4
通讯作者:
D. Marenduzzo
D. Marenduzzo
中科院分区:
化学2区
文献类型:
--
作者:
G. Foffano;J. Lintuvuori;K. Stratford;M. Cates;D. Marenduzzo

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通过计算机模拟研究了活性凝胶中胶体颗粒准二维浓缩悬浮液的动力学。值得注意的是,我们发现,即使在粒子表面没有活性向列相指向矢的任何择优锚定的情况下,活性也会诱导胶体的动态聚集。当存在这样的锚定时,主动应力反而与弹性力竞争,并重新分散在被动胶体-液晶复合材料中观察到的聚集体。我们的被动粒子在活性流体中的准二维“逆”分散(而不是更常见的活性粒子在被动流体中的“直接”悬浮)为新型软材料的自组装提供了一条很有前途的途径。
We study the dynamics of quasi-two-dimensional concentrated suspensions of colloidal particles in active gels by computer simulations. Remarkably, we find that activity induces a dynamic clustering of colloids even in the absence of any preferential anchoring of the active nematic director at the particle surface. When such an anchoring is present, active stresses instead compete with elastic forces and re-disperse the aggregates observed in passive colloid-liquid crystal composites. Our quasi-two-dimensional "inverse" dispersions of passive particles in active fluids (as opposed to the more common "direct" suspensions of active particles in passive fluids) provide a promising route towards the self-assembly of new soft materials.
DOI: 10.1103/revmodphys.85.1143
发表时间: 2013-07-19
影响因子: 44.1
作者:
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DOI: 10.1103/physreve.83.041910
发表时间: 2011-04-13
期刊: PHYSICAL REVIEW E
影响因子: 2.4
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