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Dynamics of Water Confined on the Surface of Titania and Cassiterite Nanoparticles

Published online by Cambridge University Press:  07 July 2011

Nancy L. Ross ,
Elinor C. Spencer ,
Andrey A. Levchenko ,
Alexander I. Kolesnikov ,
Douglas L. Abernathy ,
Juliana Boerio-Goates ,
Brian F. Woodfield ,
Alexandra Navrotsky ,
Guangshe Li  and
Wei Wang
...Show all authors
Nancy L. Ross
Affiliation:
Dept. of Geosciences, Virginia Tech, Blacksburg, Virginia 24061, U.S.A.
Elinor C. Spencer
Affiliation:
Dept. of Geosciences, Virginia Tech, Blacksburg, Virginia 24061, U.S.A.
Andrey A. Levchenko
Affiliation:
Setaram Inc., 8430 Central Ave., Suite C and 3D, Newark, California 94560
Alexander I. Kolesnikov
Affiliation:
Neutron Scattering Sciences Division, Oak Ridge National Laboratory, PO BOX 2008, Oak Ridge, Tennessee 37831, U.S.A.
Douglas L. Abernathy
Affiliation:
Neutron Scattering Sciences Division, Oak Ridge National Laboratory, PO BOX 2008, Oak Ridge, Tennessee 37831, U.S.A.
Juliana Boerio-Goates
Affiliation:
Dept. of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
Brian F. Woodfield
Affiliation:
Dept. of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
Alexandra Navrotsky
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616, U.S.A.
Guangshe Li
Affiliation:
State Key Lab of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou 350002, P. R. China.
Wei Wang
Affiliation:
Chemical Science Division, Oak Ridge National Laboratory, PO BOX 2008, Oak Ridge, Tennessee 37831, U.S.A.
David J. Wesolowski
Affiliation:
Chemical Science Division, Oak Ridge National Laboratory, PO BOX 2008, Oak Ridge, Tennessee 37831, U.S.A.
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Abstract

We present low-temperature inelastic neutron scattering spectra collected on two metal oxide nanoparticle systems, isostructural TiO2 rutile and SnO2 cassiterite, between 0-550 meV. Data were collected on samples with varying levels of water coverage, and in the case of SnO2, particles of different sizes. This study provides a comprehensive understanding of the structure and dynamics of the water confined on the surface of these particles. The translational movement of water confined on the surface of these nanoparticles is suppressed relative to that in ice-Ih and water molecules on the surface of rutile nanoparticles are more strongly restrained that molecules residing on the surface of cassiterite nanoparticles. The INS spectra also indicate that the hydrogen bond network within the hydration layers on rutile is more perturbed than for water on cassiterite. This result is indicative of stronger water-surface interactions between water on the rutile nanoparticles than for water confined on the surface of cassiterite nanoparticles. These differences are consistent with the recently reported differences in the surface energy of these two nanoparticle systems.

Keywords

neutron scatteringnanostructureadsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1352: Symposium GG – Titanium Dioxide Nanomaterials , 2011 , mrss11-1352-gg04-05
Copyright
Copyright © Materials Research Society 2011

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