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Permanent link (DOI): https://doi.org/10.7939/R3SQ54

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Dielectrophoresis in surface fouling prevention Open Access

Descriptions

Other title
Subject/Keyword
Trajectory
Fouling
Dielectrophoresis
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chakraborty, Tathagata
Supervisor and department
Bhattacharjee, Subir (Mechanical Engineering)
Examining committee member and department
Thundat, Thomas (Chemical and Materials Engineering)
Mitra, Sushanta (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2011-08-29T16:13:17Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
AC Dielectrophoresis, the motion of dielectric colloidal particles in the presence of an inhomogeneous AC electric field, has been utilized in this work as a mechanism for preventing channel wall fouling due to particle deposition for a multi-component colloidal system. Both attractive and repulsive DEP force fields were examined in aqueous suspensions of silica and polystyrene particles. Under a continuous cross-flow condition in a rectangular channel, particle movement away from the channel wall was visualized when a repulsive DEP force field was applied. In order to achieve a cleaner channel wall, the effect of various parameters, such as, frequency and amplitude of the AC signal, cross flow velocity, particle size and density on the particle levitation were investigated for both single-component and binary colloidal suspensions. The results also depict that the levitation of the individual species can be further controlled in order to achieve selective adsorption or field flow fractionation.
Language
English
DOI
doi:10.7939/R3SQ54
Rights
License granted by Tathagata Chakraborty (tathagat@ualberta.ca) on 2011-08-27T02:28:19Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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