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Determinationen of the zeta potential of macroscopic solids of almost any size and shape SurPASS for Solid Surface Analysis

The knowledge of zeta potential is important to understand the behavior of solid materials in many technical processes. Zeta potential is the primary information supplied by the SurPASS by measuring the streaming potential or streaming current. A dilute electrolyte is circulated through the measuring cell containing the solid sample, thus creating a pressure difference. The movement of the liquid relative to the solid surface 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 in parallel.

The combination of a well-engineered electrolyte circulation and a high-precision measurement of streaming potential and streaming current is crucial for the excellent sensitivity of the SurPASS. Integrated routines for plausibility checks increase the reliability of the measuring data.

The Windows®-based VisioLab for SurPASS software and the elaborate design of the measuring cells provide a user-friendly platform for advanced surface analysis. The Clamping Cell is the classical tool for measuring planar surfaces like foils, polymer sheets, or membranes. The Cylindrical Cell is mainly used for natural or technical fibers, granular samples and powder with particle size > 25 µm.