Nonlinear electrophoresis of dielectric particles in Newtonian fluids.

Autor: Bentor J; Department of Mechanical Engineering, Clemson University, Clemson, South Carolina, USA., Dort H; Department of Mechanical Engineering, Clemson University, Clemson, South Carolina, USA., Chitrao RA; Department of Mechanical Engineering, Clemson University, Clemson, South Carolina, USA., Zhang Y; Shanghai Diecheng Photoelectronics Technology Co., Ltd, Shanghai, P. R. China., Xuan X; Department of Mechanical Engineering, Clemson University, Clemson, South Carolina, USA.
Jazyk: angličtina
Zdroj: Electrophoresis [Electrophoresis] 2023 Jun; Vol. 44 (11-12), pp. 938-946. Date of Electronic Publication: 2022 Dec 28.
DOI: 10.1002/elps.202200213
Abstrakt: In classical electrokinetics, the electrophoretic velocity of a dielectric particle is a linear function of the applied electric field. Theoretical studies have predicted the onset of nonlinear electrophoresis at high electric fields because of the nonuniform surface conduction over the curved particle. However, experimental studies have been left behind and are insufficient for a fundamental understanding of the parametric effects on nonlinear electrophoresis. We present in this work a systematic experimental study of the effects of buffer concentration, particle size, and particle zeta potential on the electrophoretic velocity of polystyrene particles in a straight rectangular microchannel for electric fields of up to 3 kV/cm. The measured nonlinear electrophoretic particle velocity is found to exhibit a 2(±0.5)-order dependence on the applied electric field, which appears to be within the theoretically predicted 3- and 3/2-order dependences for low and high electric fields, respectively. Moreover, the obtained nonlinear electrophoretic particle mobility increases with decreasing buffer concentration (for the same particle) and particle size (for particles with similar zeta potentials) or increasing particle zeta potential (for particles with similar sizes). These observations are all consistent with the theoretical predictions for high electric fields.
(© 2022 The Authors. Electrophoresis published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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