Restructuring a passive colloidal suspension using a rotationally driven particle
Abstract
The interaction between passive and active/driven particles has introduced a new way to control colloidal suspension properties from particle aggregation to crystallization. Here, we focus on the hydrodynamic interaction between a single rotational driven particle and a suspension of passive particles near the floor. Using experiments and Stokesian dynamics simulations that account for near-field lubrication, we demonstrate that the flow induced by the driven particle can induce long-ranged rearrangement in a passive suspension. We observe an accumulation of passive particles in front of the driven particle and a depletion of passive particles behind the driven particle. This restructuring generates a pattern that can span a range more than times of the driven particle's radius. We further show that size scale of the pattern is only a function of the particle's height above the floor.
Cite
@article{arxiv.2312.00255,
title = {Restructuring a passive colloidal suspension using a rotationally driven particle},
author = {Shih-Yuan Chen and Hector Lopez-Rios and Monica Olvera de la Cruz and Michelle M. Driscoll},
journal= {arXiv preprint arXiv:2312.00255},
year = {2024}
}
Comments
S.-Y.C. and H.L-R. contributed equally