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Dynamics of water confined on the surface of titania and cassiterite nanoparticles

Conference ·
OSTI ID:1021960
 [1];  [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [3];  [3]
  1. Virginia Polytechnic Institute and State University (Virginia Tech)
  2. Setaran Inc., Newark, CA
  3. ORNL
  4. Brigham Young University
  5. University of California, Davis
  6. Chinese Academy of Sciences
+ Show Author Affiliations
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. The results of this study also support previous studies that suggest that water dissociation is more prevalent on the surface of SnO2 than TiO2.
Research Organization:
Oak Ridge National Laboratory (ORNL); Spallation Neutron Source
Sponsoring Organization:
SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1021960
Country of Publication:
United States
Language:
English

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Related Subjects

08 HYDROGEN
CHEMICAL BONDS
DISSOCIATION
DYNAMICS
HYDRATION
HYDROGEN
INELASTIC SCATTERING
INTERACTIONS
LAYERS
MEETINGS
METALS
MOLECULES
NEUTRON SPECTRA
OXIDES
PARTICLES
RUTILE
SURFACE ENERGY
SURFACES
TEMPERATURE RANGE 0065-0273 K
TIN OXIDES
TITANIUM OXIDES
WATER