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Colloidal particle deposition from electrokinetic flow in a microfluidic channel
Author(s) -
Unni Harikrishnan Narayanan,
Yang Chun
Publication year - 2009
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200800668
Subject(s) - electrokinetic phenomena , brownian motion , deposition (geology) , particle deposition , particle (ecology) , microfluidics , brownian dynamics , dlvo theory , colloid , electrolyte , colloidal particle , materials science , chemistry , mechanics , chemical physics , nanotechnology , diffusion , physics , thermodynamics , electrode , paleontology , oceanography , quantum mechanics , sediment , geology , biology
This study reports a theoretical and experimental study on the irreversible deposition of colloidal particles from electrokinetic microfluidic flow. The electrokinetic particle transport model presented in this study is based on the stochastic Langevin equation, incorporating the electrical, hydrodynamic, Derjaguin–‐Landau–Verwey–Overbeek colloidal interactions and random Brownian motion of colloidal particles. Brownian dynamics simulation is used to compute the particle deposition in terms of the surface coverage. Direct videomicroscopic observation using the parallel‐plate flow cell technique is employed to determine the deposition kinetics of polystyrene latex particles in NaCl electrolytes. The theoretical predictions are compared with experimental results, and a reasonable agreement is found.