Structure and energetics of hydroxylated silica clusters, (SiO2)M(H2O)N, M=8,16 and N=1-4: A global optimisation study

Authors Organisations
  • Edwin Flikkema(Author)
  • Kim E. Jelfs(Author)
    University of Liverpool
  • Stefan T. Bromley(Author)
    Institució Catalana de Recerca i Estudis Avançats
    University of Barcelona
Type Article
Original languageEnglish
Pages (from-to)117-122
Number of pages6
JournalChemical Physics Letters
Volume554
Early online date13 Oct 2012
DOI
Publication statusPublished - 03 Dec 2012
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Abstract

The low energy isomer spectrum of hydroxylated silica clusters, (SiO2)M(H2O)N, is investigated using global optimisation with an empirical potential and ab initio structural and energetic refinement. The cases M = 8, 16 and N = 1 - 4 are considered in gas phase with respect to their relative energetic stabilities, reaction energies (relative to hydroxylation and condensation) and geometries. All hydroxylation reactions and condensation reactions are found to be energetically downhill, with the former becoming progressively less favourable with increasing hydroxylation. Hydroxylation also appears to affect the structures of smaller anhydrous clusters more than larger ones.

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