Ionic enhancement of silica surface nanowear in electrolyte solutions

Ivan U. Vakarelski, Naofumi Teramoto, Cathy E. McNamee, Jeremy O. Marston, Ko Higashitani

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The nanoscale wear and friction of silica and silicon nitride surfaces in aqueous electrolyte solutions were investigated by using sharp atomic force microscope (AFM) cantilever tips coated with silicon nitride. Measurements were carried out in aqueous solutions of varying pH and in monovalent and divalent cation chloride and nitrate solutions. The silica surface was shown to wear strongly in solutions of high pH (≈11.0), as expected, but the presence of simple cations, such as Cs+ and Ca2+, was shown to dramatically effect the wear depth and friction force for the silica surface. In the case of monovalent cations, their hydration enthalpies correlated well with the wear and friction. The weakest hydrated cation of Cs+ showed the most significant enhancement of wear and friction. In the case of divalent cations, a complex dependence on the type of cation was found, where the type of anion was also seen to play an important role. The CaCl2 solution showed the anomalous enhancement of wear depth and friction force, although the solution of Ca(NO3)2 did not. The present results obtained with an AFM tip were also compared with previous nanotribology studies of silica surfaces in electrolyte solutions, and possible molecular mechanisms as to why cations enhance the wear and friction were also discussed.

Original languageEnglish
Pages (from-to)16072-16079
Number of pages8
JournalLangmuir
Volume28
Issue number46
DOIs
StatePublished - Nov 20 2012

Fingerprint Dive into the research topics of 'Ionic enhancement of silica surface nanowear in electrolyte solutions'. Together they form a unique fingerprint.

  • Cite this

    Vakarelski, I. U., Teramoto, N., McNamee, C. E., Marston, J. O., & Higashitani, K. (2012). Ionic enhancement of silica surface nanowear in electrolyte solutions. Langmuir, 28(46), 16072-16079. https://doi.org/10.1021/la303223q