The thermodynamic properties of hydrated γ-Al2O3 nanoparticles

Spencer, Elinor; Huang, Baiyu; Parker, Stewart F.; Kolesnikov, Alexander I.; Ross, Nancy; Woodfield, Brian

doi:10.1063/1.4850636

The thermodynamic properties of hydrated γ-Al2O3 nanoparticles

Journal Article · Sun Dec 01 04:00:00 EST 2013 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4850636· OSTI ID:1113162

Spencer, Elinor ^[1]; Huang, Baiyu ^[2]; Parker, Stewart F. ^[3]; ^[4]; Ross, Nancy ^[1]; Woodfield, Brian ^[2]

Virginia Tech, Blacksburg, VA
Brigham Young University
ISIS Facility, Rutherford Appleton Laboratory
ORNL

In this paper we report a combined calorimetric and inelastic neutron scattering (INS) study of hydrated γ-Al2O3 (γ-alumina) nanoparticles. These complementary techniques have enabled a comprehensive evaluation of the thermodynamic properties of this technological and industrially important metal oxide to be achieved. The isobaric heat capacity (Cp) data presented herein provide further critical insights into the much-debated chemical composition of γ-alumina nanoparticles. Furthermore, the isochoric heat capacity (Cv) of the surface water, which is so essential to the stability of all metal-oxides at the nanoscale, has been extracted from the high-resolution INS data and differs significantly from that of ice–Ih due to the dominating influence of strong surface-water interactions. This study also encompassed the analysis of four γ-alumina samples with differing pore diameters [4.5 (1), 13.8 (2), 17.9 (3), and 27.2 nm (4)], and the results obtained allow us to unambiguously conclude that the water content and pore size have no influence on the thermodynamic behaviour of hydrated γ-alumina nanoparticles.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1113162

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 24 Vol. 139; ISSN 0021-9606

Country of Publication:: United States

Language:: English

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