TITLE

Decreasing of the activation energy of TiO2 nanoparticles by applying ultrasound waves using the sol-gel method

AUTHOR(S)
Moghaddam, H. Milani; Nasirian, S.
PUB. DATE
December 2011
SOURCE
Iranian Journal of Physics Research;Winter2011, Vol. 11 Issue 4, p65
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this letter, titanium dioxide nanoparticles (TiO2) were synthesized via a sol-gel method and combining titanium tetrachloride (TiCl4) and ethanol. The activation energy was investigated on the phase transformation from anatase to rutile in the presence and absence of ultrasound waves. The anatase nanocrystallites were only crystallized up to the calcination of 500 °C. By increasing the calcination in the region after 500 °C, rutile nanocrystallites grew in samples, and mixed-phase TiO2 nanoparticles were obtained. Our results show that applying ultrasound waves decreases both onset transition temperature and the activation energy of the phase transformation from anatase to rutile. The activation energy showed a considerable reduction at about 18.5 k J/mol by applying the ultrasound waves.
ACCESSION #
86443294

 

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