Brownian motion and the hydrodynamic friction tensor for colloidal particles of complex shape
Brownian motion and the hydrodynamic friction tensor for colloidal particles of complex shape
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DOI：
10.1103/physreve.88.050301
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发表时间：
2013-11-22
影响因子：
2.4
通讯作者：
Loewen, Hartmut
中科院分区：
文献类型：
--
作者：
Kraft, Daniela J.;Wittkowski, Raphael;Loewen, Hartmut
我们合成了具有各种各向异性形状的胶体粒子，并使用共聚焦显微镜跟踪它们的定向分辨布朗轨迹。适当的短时相关函数的分析提供了直接访问的流体动力摩擦张量的粒子揭示了平移和旋转自由度之间的非平凡耦合。结果与实验确定的颗粒形状在低雷诺数范围内的流体动力摩擦张量计算结果一致。
We synthesize colloidal particles with various anisotropic shapes and track their orientationally resolved Brownian trajectories using confocal microscopy. An analysis of appropriate short-time correlation functions provides direct access to the hydrodynamic friction tensor of the particles revealing nontrivial couplings between the translational and rotational degrees of freedom. The results are consistent with calculations of the hydrodynamic friction tensor in the low-Reynolds-number regime for the experimentally determined particle shapes.