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

doi:10.1021/la900611u

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

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

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 language	English (US)
Pages (from-to)	8101-8110
Number of pages	10
Journal	Langmuir
Volume	25
Issue number	14
DOIs	https://doi.org/10.1021/la900611u
State	Published - Jul 21 2009

All Science Journal Classification (ASJC) codes

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

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10.1021/la900611u

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title = "Electrophoretic study of the SnO 2/aqueous solution interface up to 260 °C",

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.",

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AU - Rodriguez-Santiago, Victor

AU - Fedkin, Mark V.

AU - Wesolowski, David J.

AU - Rosenqvist, Jörgen

AU - Lvov, Serguei N.

PY - 2009/7/21

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N2 - 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.

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