Zeta Potential

Determination of Zeta potential

The zeta potential is an important parameter for assessing the stability of a liquid suspension or emulsion. In principle, it is the electrical potential of a particle in dispersion at the shear plane to the dispersing medium – usually water or an organic solvent. A high zeta potential means a strong repulsive force between two particles approaching each other in a dispersion. This prevents agglomeration or coagulation and the system is stable. However, if the zeta potential is close to zero (isoelectric point, IEP), the dispersion is unstable and tends to flocculation. Electrophoretic light scattering (ELS, BeNano series) is particularly predestined for zeta potential measurements on dispersions used in the fields of biochemistry and technology, pharmacy or food technology. Electroacoustics, implemented in the DT-300/310/330 series, is specially designed for highly concentrated suspensions in the hard materials sector (cements, battery slurries, ceramic suspensions).