Abstract
A simple measurement technique of colloidal particles' zeta-potential by using micro-PIV was proposed. This technique is based on a measurement technique using a closed cell filled with colloidal solution. In order to calculate the zeta-potential, the obtained velocity by micro-PIV is transformed to particles' electrophoresis velocity with a modified Mori-Okamoto equation, which considered an influence of a wall in parallel to the micro-PIV measurement plane. This technique enables to measure the particles' zeta-potential when the measurement plane was placed at 50μm away from the wall. The obtained zeta-potential is compared with that by other techniques for its validation.
