Abstract
We present low-temperature inelastic neutron scattering spectra collected on two metal oxide nanoparticle systems, isostructural TiO 2 rutile and SnO 2 cassiterite, between 0-550 meV. Data were collected on samples with varying levels of water coverage, and in the case of SnO 2, 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-lh 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.
| Original language | English |
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| Title of host publication | Titanium Dioxide Nanomaterials |
| Pages | 47-56 |
| Number of pages | 10 |
| DOIs | |
| State | Published - 2012 |
| Event | 2011 MRS Spring Meeting - San Francisco, CA, United States Duration: Apr 25 2011 → Apr 29 2011 |
Publication series
| Name | Materials Research Society Symposium Proceedings |
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| Volume | 1352 |
| ISSN (Print) | 0272-9172 |
Conference
| Conference | 2011 MRS Spring Meeting |
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| Country/Territory | United States |
| City | San Francisco, CA |
| Period | 04/25/11 → 04/29/11 |
Funding
N. L. Ross, E. C. Spencer, A. Navrotsky and A. A Levchenko acknowledge support from the U.S. Department of Energy, Office of Basic Energy Sciences (DOE–BES), grant DE FG03 01ER15237. A. I. Kolesnikov and D.L. Abernathy wish to acknowledge ORNL/SNS and W. Wang and D. J. Wesolowski acknowledge support from DOE-BES grant ERKCC41 (Nanoscale Complexity at the Mineral-Water Interface) at Oak Ridge National Laboratory that is managed by UT-Battelle, LLC, for DOE under contract DE-AC05-00OR22725. Research at the SNS at ORNL was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Dept. of Energy. Argonne National Laboratory is supported by DOE–BES under contract DE-AC02-06CH11357. We are thankful to L. Jirik for assistance with the INS experiments conducted at the IPNS. D. J. Wesolowski acknowledges J. Rosenqvisk and L. Anovitz at ORNL for their assistance with the cassiterite sample preparation and characterization.