An unexpected particle oscillation for electrophoresis in viscoelastic fluids through a microchannel constriction

Title
An unexpected particle oscillation for electrophoresis in viscoelastic fluids through a microchannel constriction
Author(s)
주상우Xinyu Lu[Xinyu Lu]Saurin Patel[Saurin Patel]Meng Zhang[Meng Zhang]Shizhi Qian[Shizhi Qian]Amod Ogale[Amod Ogale]Xiangchun Xuan[Xiangchun Xuan]
Keywords
POWER-LAW FLUIDS; ARBITRARY ZETA-POTENTIALS; VISCOSITY ELASTIC FLUIDS; NON-NEWTONIAN FLUIDS; CARREAU FLUID; ELECTROOSMOTIC FLOWS; POLYMER-SOLUTIONS; SPHERICAL CAVITY; UNSTEADY MOTION; SMOLUCHOWSKI VELOCITY
Issue Date
201403
Publisher
AMER INST PHYSICS
Citation
BIOMICROFLUIDICS, v.8, no.2
Abstract
Electrophoresis plays an important role in many applications, which, however, has so far been extensively studied in Newtonian fluids only. This work presents the first experimental investigation of particle electrophoresis in viscoelastic polyethylene oxide (PEO) solutions through a microchannel constriction under pure DC electric fields. An oscillatory particle motion is observed in the constriction region, which is distinctly different from the particle behavior in a polymer-free Newtonian fluid. This stream-wise particle oscillation continues until a sufficient number of particles form a chain to pass through the constriction completely. It is speculated that such an unexpected particle oscillating phenomenon is a consequence of the competition between electrokinetic force and viscoelastic force induced in the constriction. The electric field magnitude, particle size, and PEO concentration are all found to positively affect this viscoelasticity-related particle oscillation due to their respective influences on the two forces. (C) 2014 AIP Publishing LLC.
URI
http://hdl.handle.net/YU.REPOSITORY/32779http://dx.doi.org/10.1063/1.4866853
ISSN
1932-1058
Appears in Collections:
공과대학 > 기계공학부 > Articles
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