Ran R, Sun J, Müftü S, Gu AZ, Wan KT. In-Plane Rotation of Prolate Colloids Adhered to a Planar Substrate in the Presence of Flow.
LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023;
39:6487-6494. [PMID:
37098136 PMCID:
PMC10620997 DOI:
10.1021/acs.langmuir.3c00433]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/10/2023] [Indexed: 05/10/2023]
Abstract
Micron-size spherical polystyrene colloidal particles are mechanically stretched to a prolate geometry with desirable aspect ratios. The particles in an aqueous medium with specific ionic concentration are then introduced into a microchannel and allowed to settle on a glass substrate. In the presence of unidirectional flow, the loosely adhered particles in the secondary minimum of surface interaction potential are easily washed off, but the remnant in the strong primary minimum preferentially aligns with the flow direction and exercises in-plane rotation. A rigorous theoretical model is constructed to account for filtration efficiency in terms of hydrodynamic drag, intersurface forces, reorientation of prolate particles, and their dependence on flowrate and ionic concentration.
Collapse