Jung Gerhard, Villada-Balbuena Alejandro, Franosch Thomas
Laboratoire Interdisciplinaire de Physique (LIPhy), Université Grenoble Alpes, 38402 Saint-Martin-d'Hères, France.
Condensed Matter Physics Laboratory, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany.
Soft Matter. 2025 May 21;21(20):4010-4020. doi: 10.1039/d5sm00120j.
We have performed confocal microscopy experiments and computer simulations of colloidal suspensions with moderate volume fraction confined between two quasi-parallel, rough walls [A. Villada-Balbuena , Soft Matter, 2022, , 4699-4714]. Here we investigate many facets of the dynamical properties of the system, such as confined and inhomogeneous diffusion, mean first-passage times and generalized incoherent scattering functions. We observe that the experiment features strong footprints of the confinement in the dynamical properties, such as inhomogeneous diffusion coefficients and non-zero off-diagonal elements in the incoherent scattering function which we can quantitatively model and analyze with computer simulations. This allows us, for example, to systematically investigate the impact of surface roughness. Our comparative study therefore advances the fundamental understanding of the impact of confinement on dynamics in fluids and colloidal suspensions.
我们进行了共聚焦显微镜实验，并对中等体积分数的胶体悬浮液在两个准平行、粗糙壁之间受限的情况进行了计算机模拟[A. Villada-Balbuena，《软物质》，2022年，第4699 - 4714页]。在这里，我们研究了该系统动力学性质的多个方面，如受限和非均匀扩散、平均首次通过时间以及广义非相干散射函数。我们观察到，实验在动力学性质中呈现出强烈的受限特征，例如非均匀扩散系数以及非相干散射函数中出现非零的非对角元素，我们可以通过计算机模拟对其进行定量建模和分析。例如，这使我们能够系统地研究表面粗糙度的影响。因此，我们的比较研究推进了对受限对流体和胶体悬浮液动力学影响的基础理解。
