Zeta Potential Analysis

The zeta potential is a measure for the extent to which charged particles may interact with each other. In other words, the zeta potential increases with the intensity of these interactions.

A negative zeta potential (-mV) shows that the measured fiber/filler/solid particles carry a negative (-) external charge, whereas a positive zeta potential means that the fiber/filler/solid particles carry a positive (+) charge. This may be indicative of an overdosage of cationic acids- especially in papermaking processes.

The zeta potential cannot be measured directly, but can only be determined or calculated indirectly via auxiliary parameters. The SZP 04 relies on the streaming potential and various other parameters for calculation.

When counter-ions are separated or sheared off a charged particle in a liquid flow, a streaming potential is induced that can be measured in mV. The sign of the potential on the display indicates whether the charge is positive (cationic) pr negative (anionic).

The zeta potential is calculated according to the Helmholtz-Smoluchowski equation from the analytical values obtained for streaming potential, conductivity and pressure difference. These values are recorded on a printout.

• Adsorption analysis of chemical additives on fibers and solid particles
• Zeta potential analysis of highly concentrated fiber, filler and pigment slurries

Muetek Analytic, Inc., 2141 Kingston Ct. SE Suite 114, Marietta, GA 30067. Tel: 770-6120606; Fax: 770-955-2383.