Electroosmosis in an oscillating field: Avoiding distortions in measured electrophoretic mobilities

We present a theory of time-dependent electroosmotic velocity profiles in a closed long cylindrical tube subjected to an AC electric field. The theory is verified experimentally. We observe a decreasing influence of electroosmosis on measured particle mobilities with increasing field frequency. Howe...

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Bibliographic Details
Published inJournal of colloid and interface science Vol. 143; no. 1; pp. 287 - 293
Main Authors Scha¨tzel, Klaus, Weise, Wieland, Sobotta, Andreas, Drewel, Martin
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 01.04.1991
Elsevier
Subjects
Applied classical electromagnetism
Electromagnetism; electron and ion optics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Electric field
Electroosmosis
Electrophoretic mobility
Theoretical study
High frequency
Low frequency
Potassium chloride
Calcium chloride
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Summary:We present a theory of time-dependent electroosmotic velocity profiles in a closed long cylindrical tube subjected to an AC electric field. The theory is verified experimentally. We observe a decreasing influence of electroosmosis on measured particle mobilities with increasing field frequency. However, eletroosmosis still produces significant changes in the ζ potentials as calculated from measured mobilities, even at field frequencies as high as 20 Hz for our experimental geometry. Our theory may be used to correct measured mobility data for electroosmotic disturbances.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(91)90460-P