TITLE

Particle diffusion in a field-guided microfluidic channel

AUTHOR(S)
Helseth, L. E.; Wen, H. Z.; Fischer, T. M.
PUB. DATE
January 2006
SOURCE
Journal of Applied Physics;1/15/2006, Vol. 99 Issue 2, p024909
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
If an ensemble of particles is squeezed together in a trap that is suddenly removed, one may anticipate that they obey the normal Fickian diffusion equation, which predicts that the width of the system increases proportionally to the square root of the elapsed time √t. Here we show that for a finite one-dimensional system composed of particles which interact via dipolar forces, this is no longer correct. Instead, our measurements using colloidal particles in a removable magnetic trap suggest that the system size increases as t1/5, which may be of importance for the transport of interacting particles in microfluidic channels.
ACCESSION #
19601205

 

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