Electroosmotic Flow Control and Surface Conductance in Capillary Zone Electrophoresis

Mark A. Hayes, Indu Kheterpal, Andrew G. Ewing

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Electroosmotic flow within capillary zone electrophoresis can be altered electronically through a mechanism modeled as surface conductance. Experimentally, a small zone of conductive silver on the outer surface of the capillary is shown to permit good control of electroosmotic flow with an applied external voltage. This control is modeled as capacitance across the capillary wall and conductance along the double layer on the inner surface. Experimental results presented agree with theory developed from this model. Surface conductance in capillary zone electrophoresis may significantly simplify electronic control of electroosmotic flow and lead to a better understanding of the effects of chemical modifications to the inner surface of the capillary.

Original languageEnglish (US)
Pages (from-to)2010-2013
Number of pages4
JournalAnalytical Chemistry
Issue number15
StatePublished - Aug 1 1993

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry


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