Shape-dependent surface energetics of nanocrystalline TiO2

Tae Jin Park, Andrey A. Levchenko, Hongjun Zhou, Stanislaus S. Wong, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

We report the direct determination of surface enthalpies for nanophase TiO2 anatase with different morphologies derived from drop solution calorimetry in a molten sodium molybdate (3Na2O4MoO3) solvent at 702 °C. The energetics of surface hydration has been measured using a Calvet microcalorimeter coupled with a gas dosing system. The surface enthalpies of hydrated surfaces for anatase TiO2 nanoparticles, nanowires and sea-urchin-like assemblies are 0.51 ± 0.05, 1.07 ± 0.28, and 1.29 ± 0.16 J m-2, respectively, whereas those of anhydrous surfaces are 0.74 ± 0.04, 1.24 ± 0.28, and 1.41 ± 0.16 J m-2, respectively. The trend in TiO2, which shows higher surface enthalpies for more complex nanostructures, is consistent with that reported in ZnO. The shape-dependent surface enthalpy at the nanoscale level is discussed in terms of exposed surface structures. The enthalpies of hydration appear to be similar for all morphologies.

Original languageEnglish (US)
Pages (from-to)8639-8645
Number of pages7
JournalJournal of Materials Chemistry
Volume20
Issue number39
DOIs
StatePublished - Oct 21 2010
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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