Zöttl Andreas, Klop Kira E, Balin Andrew K, Gao Yongxiang, Yeomans Julia M, Aarts Dirk G A L
Institute for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10, Wien, Austria.
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK.
Soft Matter. 2019 Jul 24;15(29):5810-5814. doi: 10.1039/c9sm00903e.
We study the orientational dynamics of heavy silica microrods flowing through a microfluidic channel. Comparing experiments and Brownian dynamics simulations we identify different particle orbits, in particular in-plane tumbling behavior, which cannot be explained by classical Jeffery theory, and we relate this behavior to the rotational diffusion of the rods. By constructing the full, three-dimensional, orientation distribution, we describe the rod trajectories and quantify the persistence of Jeffery orbits using temporal correlation functions of the Jeffery constant. We find that our colloidal rods lose memory of their initial configuration in about a second, corresponding to half a Jeffery period.
我们研究了重质二氧化硅微棒在微流控通道中流动时的取向动力学。通过对比实验和布朗动力学模拟，我们识别出了不同的粒子轨道，特别是平面内翻滚行为，这无法用经典的杰弗里理论来解释，并且我们将这种行为与棒的旋转扩散联系起来。通过构建完整的三维取向分布，我们描述了棒的轨迹，并使用杰弗里常数的时间相关函数来量化杰弗里轨道的持续性。我们发现，我们的胶体棒在大约一秒内就会失去对其初始构型的记忆，这相当于半个杰弗里周期。
