Measuring Surface Zeta Potential using the Surface Zeta Potential Cell

The zeta potential of the surface of flat, non-conductive materials can be measured using an optional cell for the Zetasizer Nano called the surface zeta potential cell. 

How the surface zeta potential cell works and how it can be used to determine the surface charge of for example PTFE in 1mM NaCl at pH9.2, as observed by 300nm tracer particles DTS1230. The surface zeta obtained was -85mV.

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