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Structure and Dynamics of Water on Forsterite Surface

Abstract

The behavior of water on mineral surfaces is the key to understanding interfacial and chemical reaction processes. Olivine is one of the major rock-forming minerals and its interaction with water is a ubiquitous phenomenon both on Earth's surface and in the subsurface. This work presents a combined study using molecular dynamics (MD) simulations and quasi-elastic neutron scattering (QENS) experiments conducted with three different instruments to study the structure and dynamics of water on forsterite (Mg- end member of olivine) surface at 270 K. The combination of three different QENS instruments probes dynamical processes occurring across broad time scales (~ 1 ps to ~ 1 ns in this study). The water structure on the hydroxylated surface is composed of three distinct water layers, transitioning from well-ordered and nearly immobile closest to the surface to a less structured layer. The energies of three motions (including translation and rotation) derived from simulations agree well with the experiments, covering the energy range from a few to hundreds of micro electron volts.

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Publication details

The article was received on 09 Aug 2018, accepted on 11 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP05075A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Structure and Dynamics of Water on Forsterite Surface

    T. Liu, S. Gautam, H. Wang, L. M. Anovitz, E. Mamontov, L. F. Allard and D. R. Cole, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP05075A

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