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

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...

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Bibliographic Details
Published inIranian Journal of Physics Research Vol. 11; no. 4; pp. 411 - 416
Main Authors H Milani Moghaddam, SH Nasirian
Format Journal Article
LanguageEnglish
Published Isfahan University of Technology 01.03.2012
Subjects
activation energy
sol-gel method
Titanium dioxide nanoparticles
ultrasonic waves
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Summary: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 º C. By increasing the calcination in the region after 500 º 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 KJ/mol by applying the ultrasound waves.
ISSN:1682-6957