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Direct Measurement of Surface Energy of CeO2 by Differential Scanning Calorimetry

Hayun, Shmuel ; Ushakov, Sergey V. ; Navrotsky, Alexandra Klimm, D.

Journal of the American Ceramic Society, 2011-11, Vol.94 (11), p.3679-3682 [Periódico revisado por pares]

Blackwell Publishing Ltd

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  • Título:
    Direct Measurement of Surface Energy of CeO2 by Differential Scanning Calorimetry
  • Autor: Hayun, Shmuel ; Ushakov, Sergey V. ; Navrotsky, Alexandra
  • Klimm, D.
  • Assuntos: Calorimetry ; Coarsening ; Differential scanning calorimetry ; Enthalpy ; Heating ; Melts ; Oxides ; Scanning ; Surface chemistry ; Surface energy
  • É parte de: Journal of the American Ceramic Society, 2011-11, Vol.94 (11), p.3679-3682
  • Notas: istex:7452B54031DA12865308B4A74677C7C3D6629C0F
    U.S. Department of Energy - No. DE-FG02-97ER46053
    ark:/67375/WNG-651PP83W-H
    ArticleID:JACE4843
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
    ObjectType-Article-1
    ObjectType-Feature-2
  • Descrição: Surface energy of cerium oxide was measured by differential scanning calorimetry (DSC). Nanocrystalline CeO2 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 CeO2, 1.2 ± 0.2 J/m2, 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.
  • Editor: Blackwell Publishing Ltd
  • Idioma: Inglês
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