An AFM study of the surface force between TiO2 surfaces in CNTACl solutions

Jinhong Zhang, Roe Hoan Yoon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Direct surface force measurements have been carried out between titania surfaces in water and in CnTACl (n = 14, 18) solutions using an Atom Force Microscope (AFM). It was found that the surface potential for rutile is about -50mv. The Hamaker constant A131 is 4±1×10 -20 J for rutile in water. In CnTACl (n = 14, 18) surfactant solutions, the force curves show a repulsion/attraction/repulsion transition changing with surfactant concentration. The strongest long range attraction was observed between the TiO2 surfaces in C nTACl solutions in the vicinity of respective p.c.n. (point of charge neutralization), which decreases with surfactant chain length increasing. The long-range attractive hydrophobic force was discussed in terms of the charged-patch model of Miklavic et al. (1994) and the model proposed by Eriksson et al. (1989). The discussion sheds light on the origin of the long-range attractions observed between hydrophobic surfaces.

Original languageEnglish (US)
Title of host publicationHydrometallurgy 2008
Subtitle of host publicationProceedings of the 6th International Symposium
Pages1134-1142
Number of pages9
StatePublished - Nov 26 2008
EventHydrometallurgy 2008: 6th International Symposium - Phoenix, AZ, United States
Duration: Aug 17 2008Aug 21 2008

Publication series

NameHydrometallurgy 2008: Proceedings of the 6th International Symposium

Other

OtherHydrometallurgy 2008: 6th International Symposium
CountryUnited States
CityPhoenix, AZ
Period8/17/088/21/08

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Metals and Alloys

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