Abstract
Dielectrophoretic behavior of single polystyrene-carboxylate microparticles and polystyrene microparticles was studied with a quadrupole microelectrode. For positive dielectrophoresis (DEP) of polystyrene-carboxylate particle observed in the lower frequency region (≤10 kHz), a DEP mobility coefficient (α) was almost proportional to the square of ac voltage (Urms, root mean square), as was expected from standard theories of DEP. The α values did not depend on the particle radius (re), but depended on the kind of electrolyte in the order HCl ≫ KCl ≈ KOH ≥ tetrabutylammonium chloride, showing a specific enhancement by H+. Since this observation was against the standard theories, we introduced a DEP radius (rDEP) of a Debye-type function instead of the particle radius to fit the observed α values in the lower frequency region. The positive DEP behaviors were reproduced by a function of rDEP and the surface conductivity of the negatively charged particles. As for negative DEP observed in the higher frequency r...
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