TITLE

A high-precision study of hindered diffusion near a wall

AUTHOR(S)
Sharma, Prerna; Ghosh, Shankar; Bhattacharya, S.
PUB. DATE
September 2010
SOURCE
Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p104101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A high-precision study of hindered diffusion of a sphere due to its proximity to a solid interface was performed using an optical tweezer combined with digital holography microscopy and a phase-sensitive detection technique. The study provides a confirmation, with high accuracy and no adjustable parameters, of Faxen’s law which describes the variation of the diffusivity of a sphere as a function of its distance from the wall in a Newtonian liquid due to hydrodynamic effects. This general technique is useful for application in microfluidics and lubrication of small devices with moving parts.
ACCESSION #
53507814

 

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