Direct measurements of colloidal hydrodynamics near flat boundaries using oscillating optical tweezers

Chungil Ha, H.D. Ou-Yang and Hyuk Kyu Pak

Physica A: Statistical Mechanics and its Applications, 2013, vol. 392, issue 17, 3497-3504

Abstract: We studied the hydrodynamic interaction between a colloidal particle close to flat rigid boundaries and the surrounding fluid using oscillating optical tweezers. A colloidal particle located near walls provides a model system to study the behavior of more complex systems whose boundaries can be modeled as effective walls, such as a blood tube, cell membrane, and capillary tube in bio-MEMS. In this study, we measure the hydrodynamic interaction directly without using the Stokes–Einstein relation. Two different cases are studied: a colloidal sphere near a single flat wall and a colloidal sphere located at the midplane between two flat walls. The colloidal hydrodynamics is measured as a function of the distance between the particle and the walls, and is compared with the theoretical results from well-defined hydrodynamics approximations.

Keywords: Hydrodynamic interaction; Oscillating optical tweezers; Microfluidics; Boundary effects (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:392:y:2013:i:17:p:3497-3504

DOI: 10.1016/j.physa.2013.04.014

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