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Direct Measurement of Surface Energy of CeO 2 by Differential Scanning Calorimetry
Author(s) -
Hayun Shmuel,
Ushakov Sergey V.,
Navrotsky Alexandra
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04843.x
Subject(s) - differential scanning calorimetry , enthalpy , calorimetry , scanning electron microscope , analytical chemistry (journal) , nanocrystalline material , materials science , chemistry , adsorption , crystallography , thermodynamics , chromatography , composite material , physics
Surface energy of cerium oxide was measured by differential scanning calorimetry ( DSC ). Nanocrystalline CeO 2 samples were synthesized by a nonaqueous sol–gel method and their surface and interfacial areas were determined from nitrogen adsorption, X ‐ray diffraction, and electron microscopy measurements. Three samples were repeatedly heated in a differential scanning calorimeter and the excess enthalpy was obtained from the difference in DSC traces between first heating, during which coarsening occurred, and second heating. Surface enthalpy was calculated from excess enthalpy and from changes in surface and interfacial areas. The measured surface enthalpy for CeO 2 , 1.2 ± 0.2 J/m 2 , is consistent with values from oxide melt solution calorimetry on samples with different surface areas. This is the first successful measurement of surface energy using scanning calorimetry.