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

被引：12
|
作者：
Ha, Chungil [1 ,2 ]
Ou-Yang, H. D. [2 ]
Pak, Hyuk Kyu [1 ]
机构：
[1] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea
[2] Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA
来源：
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2013年 / 392卷 / 17期
基金：
美国国家科学基金会; 新加坡国家研究基金会;
关键词：
Hydrodynamic interaction; Oscillating optical tweezers; Microfluidics; Boundary effects; BROWNIAN PARTICLES; MOTION; SPHERE;
D O I：
10.1016/j.physa.2013.04.014
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：3497 / 3504
页数：8
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