The zeta potential of particles in aqueous suspension depends on the chemical compositions on particles’ surfaces and also the environments such as pH, concentration of the ions and small molecule additives. Typically, in a diluted aqueous system, the concentration of the particles and the zeta potential are not significantly related. However, when the concentration of the particles exceeds a critical point, it is necessary to consider the effect on zeta potential value contributed by the stronger particle-particle interactions and a larger number of charged ions in the solvent environment.

In this application note, the zeta potentials of fat emulsion dispersed in water at different concentrations are measured by the BeNano 180 Zeta.