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Review of surface water interactions with metal oxide nanoparticles

Published online by Cambridge University Press:  15 February 2019

Jason J. Calvin
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA
Peter F. Rosen
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA
Nancy L. Ross
Affiliation:
Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
Alexandra Navrotsky
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, Davis, California 95616, USA
Brian F. Woodfield*
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA
*
a)Address all correspondence to this author. e-mail: brian_woodfield@byu.edu
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Abstract

Surface water can affect the properties of metal oxide nanoparticles. Investigations on several systems revealed that nanoparticles have different thermodynamic properties than their bulk counterparts due to adsorbed water on their surfaces. Some thermodynamically metastable phases of bulk metal oxides become stable when reduced to the nanoscale, partially due to interactions between high energy surfaces and surface water. Water adsorption microcalorimetry and high-temperature oxide melt solution calorimetry, low-temperature specific heat calorimetry, and inelastic neutron scattering are used to understand the interactions of surface water with metal oxide nanoparticles. Computational methods, such as molecular dynamics simulations and density functional theory calculations, have been used to study these interactions. Investigations on titania, cassiterite, and alumina illustrate the insights gained by these measurements. The energetics of water on metal oxide surfaces are different from those of either liquid water or hexagonal ice, and there is substantial variation in water interactions on different metal oxide surfaces.

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Type
Invited Review
Copyright
Copyright © Materials Research Society 2019 

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