Sur PASS

Surface Potential Analyzer for Solid Samples , Anton Paar

The SurPASS electrokinetic analyzer in surface analysis is used to investigate the zeta potential of macroscopic solids based on a streaming potential and streaming current measurement. During a relative movement between the solid and liquid phases, the diffuse layer is sheared off, thus creating a potential difference: the streaming potential. The electrokinetic effects of streaming potential, is suitable to determine the zeta potential of macroscopic solid surfaces.

 The zeta potential is related to the surface charge at a solid/liquid interface and is a powerful indicator for the surface chemistry (pH titration) and liquid-on-solid surface adsorption processes. This information can improve surface properties and the development of new specialized materials.

In addition, use the surface zeta potential to predict electrostatic attraction or repulsion between solutes and solid surfaces, for determining the material’s isoelectric point as well as properties like material conductance, porosity, or swelling.