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 10 times the driven particles radius. We further show that size scale of the pattern is only a function of the particles height above the floor.
Original language | English (US) |
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Pages (from-to) | 2151-2161 |
Number of pages | 11 |
Journal | Soft Matter |
Volume | 20 |
Issue number | 9 |
DOIs | |
State | Published - Feb 6 2024 |
Funding
We thank Brennan Sprinkle for fruitful discussions concerning Brownian motion of low density particles, and Bhargav Rallabandi for discussions on the P\u00E9clet number and tracers. H. M. L. R. acknowledges support from a MRSEC-funded Graduate Research Fellowship, (DMR-2011854). This work was primarily supported by the University of Chicago Materials Research Science and Engineering Center, which is funded by National Science Foundation under award number DMR-2011854.
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics