Electrophoretic study of the SnO 2/aqueous solution interface up to 260 °C

Victor Rodriguez-Santiago, Mark V. Fedkin, David J. Wesolowski, Jörgen Rosenqvist, Serguei N. Lvov

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Abstract

An electrophoresis cell developed in our laboratory was utilized to determine the zeta potential at the SnO 2 (cassiterite)/aqueous solution (10 -3 mol kg -1 NaCl) interface over the temperature range from 25 to 260 °C. Experimental techniques and methods for the calculation of zeta potential at elevated temperature are described. From the obtained zeta potential data as a function of pH, the isoelectric points (IEPs) of SnO 2 were obtained for the first time. From these IEP values, the standard thermodynamic functions were calculated for the protonationdeprotonation equilibrium at the SnO 2 surface, using the 1-pK surface complexation model. It was found that the IEP values for SnO 2 decrease with increasing temperature, and this behavior is compared to the predicted values by the multisite complexation (MUSIC) model and other semitheoretical treatments, and were found to be in excellent agreement.

Original languageEnglish (US)
Pages (from-to)8101-8110
Number of pages10
JournalLangmuir
Volume25
Issue number14
DOIs
StatePublished - Jul 21 2009

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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