By using a specially designed cell, the Zeta potential of a flat surface can be measured through the same process as Zeta potential for particles in solution. While the flat solid surface does not contribute particles for measurement, the surface Zeta potential is measured by adding probe particles to a test solution. As with Zeta potential for particles, flat surface Zeta potential can be calculated from the measured electrophoretic mobility of the probe particles. The characterization of flat surface Zeta potential can lead to a better understanding of how a material such as thin films and coatings behave.

Sample	Teflon Plate	Lint-Free Cloth	Rubber	Filtration Membrane A	Filtration Membrane B
Zeta Potential (mV)	-51.22	-34.67	-24.74	-34.21	-13.78