The influence of ionic strength on surface zeta potential

This application note discusses the influence of sample ionic strength on surface zeta potential by studying the effect of various concentrations of a monovalent salt on two different surfaces: polycarbonate and PTFE. For PTFE the surface potential went from -60mV (at 0.1 mM KCl) to -20mV (at 30mM KCl). For the polycarbonate material the potential varied from -70mV (at 0.1 mM KCl) to -25mV (at 100mM KCl).

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