Reactions and clustering of water with silica surface

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Abstract

The interaction between silica surface and water is an important topic in geophysics and materials science, yet little is known about the reaction process. In this study we use first-principles molecular dynamics to simulate the hydrolysis process of silica surface using large cluster models. We find that a single water molecule is stable near the surface but can easily dissociate at three-coordinated silicon atom defect sites in the presence of other water molecules. These extra molecules provide a mechanism for hydrogen transfer from the original water molecule, hence catalyzing the reaction. The two-coordinated silicon atom is inert to the water molecule, and water clusters up to pentamer could be stably adsorbed at this site at room temperature.

Details

Original languageEnglish
Article number144709
Pages (from-to)1-9
Number of pages9
JournalJournal of Chemical Physics
Volume122
Issue number14
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

    Research areas

  • Hydrolysis, Silica

ID: 3593809