Low-frequency Dielectrophoretic Response of a Single Particle in Aqueous Suspensions

Overview

Journal Biomicrofluidics

Publisher American Institute of Physics

Specialty Biomedical Engineering

Date 2016 Feb 10

PMID 26858820

Authors

Jingyu Wang

Ming-Tzo Wei

H Daniel Ou-Yang

Affiliations

Soon will be listed here.

Abstract

We use optical tweezers-based dielectrophoresis (DEP) force spectroscopy to investigate the roles of the electrical double layer in the AC dielectric response of an individual colloidal particle in an aqueous medium. Specifically, we measure the DEP crossover frequency as a function of particles size, medium viscosity, and temperature. Experimental results were compared to low frequency relaxation mechanisms predicted by Schwarz, demonstrating the dielectrophoretic responses in the frequency range between 10 kHz and 1 MHz were dominated by counterion diffusion within the electric double layer.

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