Electrokinetic Analyzer for Solid Surface Analysis: SurPASS

The SurPASS electrokinetic analyzer helps scientists in the fields of chemistry and materials science to improve and adjust surface characteristics and to design new specialized material properties e.g. for polymers, textiles, ceramics, glass or surfactants.

Use the SurPASS electrokinetic analyzer in surface analysis to investigate the zeta potential of macroscopic solids based on a streaming potential and streaming current measurement. 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 phase adsorption processes. SurPASS helps you to understand and improve surface properties and to develop new specialized materials.

Zeta potential determination with the SurPASS is based on the measurement of streaming potential and streaming current. A dilute electrolyte is circulated through the measuring cell containing the solid sample, thus creating a pressure difference. A relative movement of the charges in the electrochemical double layer occurs and gives rise to the streaming potential. This streaming potential – or alternatively the streaming current – is detected by electrodes placed at both sides of the sample. The electrolyte conductivity, temperature and pH value are determined simultaneously.

The SurPASS electrokinetic analyzer introduces a state-of-the-art tool for solid surface characterization. This instrument is the result of many years of experience with the streaming potential technique at Anton Paar and our close cooperation with universities and research institutes. The well-engineered electrolyte circulation, the elaborate electronics concept and the easy-to-use and rugged measuring cells provide a user-friendly platform for advanced surface analysis.

The continuous control of volume flow rate and differential pressure together with a high-precision measurement of streaming potential, streaming current, and cell resistance are crucial for the excellent measuring sensitivity. Integrated routines for plausibility checks increase the reliability of the measuring data