Low-frequency dielectrophoretic response of a single particle in aqueous suspensions

被引：1
作者：
Wang, Jingyu [1 ]
Wei, Ming-Tzo [2 ]
Ou-Yang, H. Daniel [1 ,2 ,3 ]
机构：
[1] Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA
[2] Lehigh Univ, Bioengn Program, Bethlehem, PA 18015 USA
[3] Lehigh Univ, Inst Emuls Polymers, Bethlehem, PA 18015 USA
来源：
BIOMICROFLUIDICS | 2016年 / 10卷 / 01期
关键词：
DIELECTRIC-DISPERSION; COLLOIDAL PARTICLES; LATEX-PARTICLES; POLARIZATION;
D O I：
10.1063/1.4940037
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
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. (C) 2016 AIP Publishing LLC.
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页数：8
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