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Condensed Matter > Soft Condensed Matter
Title: Brownian motion of a charged colloid in restricted confinement
(Submitted on 13 Dec 2020 (v1), last revised 17 Apr 2021 (this version, v2))
Abstract: We study the Brownian motion of a charged colloid, confined between two charged walls, for small separation between the colloid and the walls. The system is embedded in an ionic solution. The combined effect of electrostatic repulsion and reduced diffusion due to hydrodynamic forces results in a specific motion in the direction perpendicular to the confining walls. The apparent diffusion coefficient at short times as well as the diffusion characteristic time are shown to follow a sigmoid curve as function of a dimensionless parameter. This parameter depends on the electrostatic properties and can be controlled by tuning the solution ionic strength. At low ionic strength, the colloid moves faster and is localized, while at high ionic strength it moves slower and explores a wider region between the walls, resulting in a larger diffusion characteristic time.
Submission history
From: Yael Avni [view email][v1] Sun, 13 Dec 2020 14:31:01 GMT (712kb,D)
[v2] Sat, 17 Apr 2021 08:08:30 GMT (714kb,D)
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