期刊
CHEMISTRY OF MATERIALS
卷 25, 期 8, 页码 1408-1415出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm302129a
关键词
TiO2; anatase; rutile; phase transformation; particle growth; nanoparticle aggregate
资金
- University of Minnesota
- National Science Foundation [NSF-0957696]
- Nanostructural Materials and Processes Program at the University of Minnesota
- NSF via the MRSEC program
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0957696] Funding Source: National Science Foundation
Phase transformation and particle growth are fundamental processes that govern final particle size and morphology, as well as phase composition. At the nanoscale, these processes can be significantly affected by initial particle size. Rates of anatase growth and its transformation to rutile increase with decreasing initial size under hydrothermal conditions at pH 1 and pH 3. Overall, rates are slower at the higher pH. At pH 1, the data fit well to a kinetic model developed based on a dissolution-precipitation mechanism. However, at pH 3, it deviates substantially from the model, indicating that the transformation occurs via a different mechanism or a mixture of dissolution precipitation and another mechanism, which likely involves aggregation. Finally, the compactness of the aggregates affects the processes significantly. That is, densely aggregated particles show high transformation and growth rates compared to loosely aggregated ones.
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