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Issue 39, 2010
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Shape-dependent surface energetics of nanocrystalline TiO2

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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 (3Na2Oŀ4MoO3) 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.

Graphical abstract: Shape-dependent surface energetics of nanocrystalline TiO2

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Publication details

The article was received on 08 Jul 2010, accepted on 10 Aug 2010 and first published on 08 Sep 2010


Article type: Paper
DOI: 10.1039/C0JM02192J
Citation: J. Mater. Chem., 2010,20, 8639-8645
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    Shape-dependent surface energetics of nanocrystalline TiO2

    T. Park, A. A. Levchenko, H. Zhou, S. S. Wong and A. Navrotsky, J. Mater. Chem., 2010, 20, 8639
    DOI: 10.1039/C0JM02192J

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