Bleibel Johannes, Domínguez Alvaro, Oettel Martin
Institut für Angewandte Physik, Auf der Morgenstelle 10, Eberhard Karls Universität, 72076 Tübingen, Germany. Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany.
J Phys Condens Matter. 2015 May 20;27(19):194113. doi: 10.1088/0953-8984/27/19/194113. Epub 2015 Apr 29.
We investigate the influence of 3D hydrodynamic interactions on confined colloidal suspensions, where only the colloids are restricted to one or two dimensions. In the absence of static interactions among the colloids, i.e., an ideal gas of colloidal particles with a finite hydrodynamic radius, we find a divergent collective diffusion coefficient. The origin of the divergence is traced back to the dimensional mismatch of 3D hydrodynamic interactions and the colloidal particles moving only in 1D or 2D. Our results from theory are confirmed by Stokesian dynamics simulations and supported by light scattering observational data for particles at a fluid interface.
我们研究了三维流体动力学相互作用对受限胶体悬浮液的影响，其中只有胶体被限制在一维或二维空间中。在胶体之间不存在静态相互作用的情况下，即具有有限流体动力学半径的胶体粒子的理想气体，我们发现集体扩散系数发散。这种发散的起源可追溯到三维流体动力学相互作用与仅在一维或二维中移动的胶体粒子之间的维度不匹配。我们的理论结果得到了斯托克斯动力学模拟的证实，并得到了流体界面处粒子的光散射观测数据的支持。
