SIGNIFICANCE OF VOLTA AND COMPENSATION STATES AND THE MEASUREMENT OF SURFACE POTENTIALS OF MONOLAYERS.

B. A. Pethica, M. M. Standish, J. Mingins, C. Smart, D. H. Iles, M. E. Feinstein, S. A. Hossain, J. B. Pethica

Research output: Contribution to conferencePaper

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Abstract

The thermodynamic analysis of the Volta effect by Koenig was studied for insoluble monolayers at air/water interfaces. Capacity measurements with a frequency bridge and with vibrating plate electrodes were used to test the basic assumptions of Koenig. The compensation effect was studied, and the conditions to verify the compensation method for measuring changes in //X potential were established for different types of spread monolayers. The field effect we reported for zwitterionic molecules is shown now to be an artefact produced by changes in the contact angle at the edge of the working interface at high monolayer pressures, with consequent changes in the geometry of the interfacial condenser. Within experimental limits, Kelvin's assumption that the Volta and compensation potentials are equal and opposite is correct for the systems studied.

Original languageEnglish (US)
Pages123-113
Number of pages11
StatePublished - Jan 1 1974
Eventfor mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc - Atlantic City, NJ
Duration: Sep 11 1974Sep 13 1974

Conference

Conferencefor mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc
CityAtlantic City, NJ
Period9/11/749/13/74

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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    Pethica, B. A., Standish, M. M., Mingins, J., Smart, C., Iles, D. H., Feinstein, M. E., Hossain, S. A., & Pethica, J. B. (1974). SIGNIFICANCE OF VOLTA AND COMPENSATION STATES AND THE MEASUREMENT OF SURFACE POTENTIALS OF MONOLAYERS.. 123-113. Paper presented at for mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc, Atlantic City, NJ, .