Extending the Lifetime of Zeta Potential Electrodes

J. Bodycomb, D. Bruno, I. Treviranus, M. Bumiller
HORIBA Scientific, US

Keywords: zeta potential, characterization, light scattering

Summary:

Nanoparticle development and manufacturing require appropriate particle characterization techniques to determine if design or quality goals are being met. One important aspect of many nanoparticle systems is the zeta potential, a measure of surface charge. Particle charge is typically measured by a technique known as electrophoretic light scattering. In this measurement, light scattering is used to probe the motion of a particle due to an applied electric field. The effective application of electric field is a critical part of the zeta potential measurement. Therefore, the choice of electrode material has a profound effect on the measurement results. An Uzgiris type cell with graphite electrodes was tested for longevity, that is, the number of zeta potential measurements that could be performed with the cell before the measurement results degraded. It was shown that graphite can be used for over 800 measurements and therefore it lasts longer than other electrode systems.