Electrophoretic light scattering

Electrophoretic light scattering is based on dynamic light scattering. The frequency shift or phase shift of an incident laser beam depends on the dispersed particles mobility. In the case of dynamic light scattering, Brownian motion causes particles motion. In the case of electrophoretic light scattering, oscillating electric field performs the same function.

This method is used for measuring electrophoretic mobility and then calculating zeta potential. The last setp of calculation requires information on viscosity and dielectric permittivity of the dispersion medium. Appropriate electrophoresis theory is also required. Sample diltuin is necessary in order to eliminate particles interaction.