title: Low-frequency dielectrophoretic response of a single particle in aqueous suspensions.
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.
authors: Department of Physics, Lehigh University , Bethlehem, Pennsylvania 18015, USA.
authors: Jingyu
authors: 0000-0003-3109-7135
authors: J
authors: Wang
authors: Bioengineering Program, Lehigh University , Bethlehem, Pennsylvania 18015, USA.
authors: Ming-Tzo
authors: MT
authors: Wei
authors: H Daniel
authors: HD
authors: Ou-Yang