High temperature microelectrophoresis studies of the rutile/aqueous solution interface

Mark V. Fedkin, Xiangyang Zhou, James D. Kubicki, Andrei V. Bandura, Serguei N. Lvov, Michael L. Machesky, David J. Wesolowski

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

A recently developed high temperature microelectrophoresis cell was employed for ζ-potential measurements at the rutile/aqueous solution interface over a wide range of pH at temperatures of 25, 120, and 200 °C. Water, 0.001 mol kg-1 NaCl(aq), and 0.01 mol kg-1 NaCl(aq) solutions were tested at these temperatures. The desired pH values were attained by adding either HCl(aq) or NaOH(aq). The obtained experimental data allowed us to estimate isoelectric point pH values (pHiep) of 5.26 (±0.45) at 25 °C, 5.13 (±0.37) at 120 °C, and 4.50 (±0.55) at 200 °C. This decrease in pHiep values with increasing temperature agrees with the decease in point of zero net proton charge (pHznpc) pH values (as determined by potentiometric titration) observed for similar rutile powders in our previous studies. ζ-potential data were combined with the proton charge results and rationalized using a surface complexation modeling approach. Modeling results indicate that ζ-potentials are expressed at a distance that is generally equal to (within error) the so-called diffuse double layer thickness (k-1).

Original languageEnglish
Pages (from-to)3797-3804
Number of pages8
JournalLangmuir
Volume19
Issue number9
DOIs
StatePublished - Apr 29 2003
Externally publishedYes

Fingerprint

rutile
aqueous solutions
Protons
Temperature
protons
Complexation
Titration
titration
Powders
temperature
titanium dioxide
Water
estimates
cells
water

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Fedkin, M. V., Zhou, X., Kubicki, J. D., Bandura, A. V., Lvov, S. N., Machesky, M. L., & Wesolowski, D. J. (2003). High temperature microelectrophoresis studies of the rutile/aqueous solution interface. Langmuir, 19(9), 3797-3804. https://doi.org/10.1021/la0268653

High temperature microelectrophoresis studies of the rutile/aqueous solution interface. / Fedkin, Mark V.; Zhou, Xiangyang; Kubicki, James D.; Bandura, Andrei V.; Lvov, Serguei N.; Machesky, Michael L.; Wesolowski, David J.

In: Langmuir, Vol. 19, No. 9, 29.04.2003, p. 3797-3804.

Research output: Contribution to journalArticle

Fedkin, MV, Zhou, X, Kubicki, JD, Bandura, AV, Lvov, SN, Machesky, ML & Wesolowski, DJ 2003, 'High temperature microelectrophoresis studies of the rutile/aqueous solution interface', Langmuir, vol. 19, no. 9, pp. 3797-3804. https://doi.org/10.1021/la0268653
Fedkin MV, Zhou X, Kubicki JD, Bandura AV, Lvov SN, Machesky ML et al. High temperature microelectrophoresis studies of the rutile/aqueous solution interface. Langmuir. 2003 Apr 29;19(9):3797-3804. https://doi.org/10.1021/la0268653
Fedkin, Mark V. ; Zhou, Xiangyang ; Kubicki, James D. ; Bandura, Andrei V. ; Lvov, Serguei N. ; Machesky, Michael L. ; Wesolowski, David J. / High temperature microelectrophoresis studies of the rutile/aqueous solution interface. In: Langmuir. 2003 ; Vol. 19, No. 9. pp. 3797-3804.
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