Apparatus for zeta potential measurement of rectangular flow cells

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Abstract
The apparatus described in this paper is designed to measure the zeta potential of rectangular plates of materials. Additionally, this design permits exposure of the plates to protein solutions injected into an electrolyte flowing between the plates. The plates, separated by glass shims, form a rectangular flow cell that is readily disassembled after exposure, enabling a detailed surface chemical examination of the adsorbed protein. Zeta potentials are calculated with values from the ratio of the streaming potential to the differential pressure drop across the cell, using an expression for the rectangular flow cell derived in the course of this work. Modulated fluid flow conditions reduce the effect of electrical drift of the measuring electrodes. Zeta potential, as a function of salt concentration (for flow cells constructed from glass slides and quartz plates), is documented and compared with present values in literature.

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