Zeta Potential Measurement

Synonyms

Electrokinetic potential; Surface potential

Definition

Zeta potential is defined as the electrical potential at the shear plane of the electric double layer. Measurement techniques are based on indirect readings obtained during electrokinetic experiments. Typically, the magnitude of the zeta potential varies between ${\mathrm{0}}\hbox{--}{\mathrm{200}}{\mathrm{mV}}$ where both negative and positive values are possible depending on the electrochemistry of the solid-liquid interface.

Overview

Zeta potentialrefers to the electrokinetic potential at the shear surface of the electric double layer. Along with surface conductance, zeta potential is an important parameter in the study and modeling of a variety of electrokinetic phenomena relevant to microfluidics and Lab-on-a-Chip devices. The zeta potential of a solid-liquid interface depends on a number of factors including the ion concentration, ion valence, pH level and temperature of the solution. For this reason each...