Effect of adsorption on the surface structure of sodium alumino-silicate glasses: a molecular dynamics simulation

D. C. Athanasopoulos, Steve Garofalini

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Classical molecular dynamics (MD) computer simulations were used to study adsorption of model metals onto sodium alumino-silicate glasses and the effect these adsorbates have on the surface structure of the glass substrates. Multibody potentials were used to describe the substrate-substrate interactions; Lennard-Jones potentials were used to describe the adsorbate-adsorbate and adsorbate-substrate interactions. Lennard-Jones parameters and adsorbate mass were chosen to model Pt as the adsorbate. The adsorbate atoms penetrated 5-6Å into the glass, with multilayer coverage eventually occurring during deposition. The substrate showed a slight compression of the surface due to the presence of the adsorbate film. There was also a pronounced shift to smaller bond angles in the distribution of siloxane bond angles at the bridging oxygen. This redistribution was predominantly caused by a compression of siloxane bonds in 5 and 6 membered rings, although there was a partial rearrangement of ring sizes. Finally, Na at the surface were displaced by the adsorbate atoms such that Na were observed in the adsorbate film and at the film/vacuum interface.

Original languageEnglish
Pages (from-to)129-138
Number of pages10
JournalSurface Science
Issue number1-2
Publication statusPublished - Jun 15 1992


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

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