Nonlinear Electrophoresis of Highly Charged Nonpolarizable Particles

Physical Review Letters
Soichiro TottoriDouwe Jan Bonthuis

Abstract

Nonlinear field dependence of electrophoresis in high fields has been investigated theoretically, yet experimental studies have failed to reach consensus on the effect. In this Letter, we present a systematic study on the nonlinear electrophoresis of highly charged submicron particles in applied electric fields of up to several kV/cm. First, the particles are characterized in the low-field regime at different salt concentrations and the surface charge density is estimated. Subsequently, we use microfluidic channels and video tracking to systematically characterize the nonlinear response over a range of field strengths. Using velocity measurements on the single particle level, we prove that nonlinear effects are present at electric fields and surface charge densities that are accessible in practical conditions. Finally, we show that nonlinear behavior leads to unexpected particle trapping in channels.

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Citations

May 27, 2021·Soft Matter·Soichiro TottoriUlrich F Keyser
Jul 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuki Uematsu
Oct 28, 2020·Analytical Chemistry·Sofia Antunez-VelaBlanca H Lapizco-Encinas
Aug 5, 2021·Electrophoresis·Nur Nasyifa Mohd MaidinMohd Ambri Mohamed
Nov 20, 2021·Electrophoresis·Alaleh Vaghef-Koodehi, Blanca H Lapizco-Encinas

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