AC Electrophoresis; Deposition of Ceramic Nanaoparticles on In-plane Electrodes at Low Frequencies

In this paper, deposition of ceramic nanoparticles on in-plane electrodes under the influence of AC electric fields is investigated. Particles are dispersed in a non-aqueous suspension and the frequencyrange is between 0.01 Hz ot 10 kHz. Analysis of the particle response to the applied field is a difficulttask due to the mutual effect of electric- and hydrodynamic force which are present in the system. In this work, however, we show the possibility of dividing the frequency range into four domains with four distinct governing mechanisms. Possible mechanisms are suggested and dominant forces aredetermined for each domain. In situ optical microscopy observations as well as numerical calculations are used for three dimensional visualization of nanoparticles´ movement dispersed in liquid medium. New applications such as micro-patterning and sorting ceramic particles are introduced for the first time.

Keywords:

Electrophoretic Deposition (EPD) , AC Electric Field , Ceramic Nanoparticle , Dielectrophoresis , AC- Electroosmosis