Kraft Daniela J, Wittkowski Raphael, ten Hagen Borge, Edmond Kazem V, Pine David J, Löwen Hartmut
Center for Soft Matter Research, Department of Physics, New York University, New York, New York 10003.
SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Nov;88(5):050301. doi: 10.1103/PhysRevE.88.050301. Epub 2013 Nov 22.
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.
我们合成了具有各种各向异性形状的胶体颗粒，并使用共聚焦显微镜追踪它们在方向上分辨的布朗轨迹。对适当的短时相关函数进行分析，可直接获取颗粒的流体动力学摩擦张量，揭示平动和转动自由度之间的非平凡耦合。结果与针对实验确定的颗粒形状在低雷诺数 regime 下的流体动力学摩擦张量计算结果一致。
