Journal
CRYSTAL GROWTH & DESIGN
Volume 10, Issue 5, Pages 2185-2191Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg901429u
Keywords
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Funding
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20092302120073]
- Development Program for Outstanding Young Teachers in Harbin Institute of Technology [HITQNJS.2008.030]
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [HIT.NSRIF.2009058]
- Natural Science Foundation of China [20675059, 20621502, 20921062]
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The successful adjustment of phase composition and morphology of anatase/rutile TiO(2) nanocomposites is achieved via a soft chemical strategy, which involves no templates, hydrothermal treatments, or calcinations. The process consists of a NaOH treatment of the hydrolysate of titanium tetra-n-butoxide and a subsequent acidic peptization of the H-titanate intermediate. The effects of the acid peptization time, acid volume, and the NaOH-treatment time on the properties of products are systematically investigated. For the first time, the two-way phase transition between anatase and rutile is realized through adjusting the acid peptization time, which provides a promising way to control the phase ratio in preparing TiO(2) anatase/rutile composites. The mechanism of the phase transitions and crystal growth under such soft chemical processes is discussed in detail, and the evolution of the phase composition is illustrated according to dissolution reassembly equilibrium.
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