Estimation of Dielectric Constant of Small Particles Using Negative Dielectrophoresis

Negative Dielectrophoresis를 이용한 미세 입자의 유전율 측정

  • Lee, Sang-Wook (School of Electrical Engineering, Seoul National University) ;
  • Kim, Yong-Wook (Devices & Materials Lab., LG Electronics Research Center) ;
  • Kim, Yong-Kweon (School of Electrical Engineering, Seoul National University)
  • Published : 1996.11.16

Abstract

The dielectric constants of small particles are estimated using negative dielectrophoresis(DEP). A pair of cylindrical electrodes is proposed to produce a non-uniform electric field that levitates a dielectric particle. Measuring the height of the levitated particle, we can calculate the effective polarizability, and estimate the dielectric constant of the particle using a nonlinear regression method. By determining dielectric constant of polystyrene and polychloromethylstyrene particle, the proposed electrode structure and method show the possibility to measure the dielectric constants of dielectric particles.

Keywords