Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles
Titanium dioxide nanopowders were synthesized by the diffusion controlled sol-gel process (LaMer model) and characterized by DTA-TG, XRD, and SEM. The prepared TiO2 nanoparticles have uniform size and morphology, and the phase transformation kinetics of obtained material was studied by interpretati...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Hindawi Limited
2010-01-01
|
Series: | Journal of Nanomaterials |
Online Access: | http://dx.doi.org/10.1155/2010/626978 |
id |
doaj-9881859cedec4566846403efb0fbbc73 |
---|---|
record_format |
Article |
spelling |
doaj-9881859cedec4566846403efb0fbbc732020-11-24T21:45:10ZengHindawi LimitedJournal of Nanomaterials1687-41101687-41292010-01-01201010.1155/2010/626978626978Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 NanoparticlesH. Mehranpour0M. Askari1M. Sasani Ghamsari2H. Farzalibeik3Department of Material Science and Engineering, Sharif University of Technology, Tehran 11155-9466, IranDepartment of Material Science and Engineering, Sharif University of Technology, Tehran 11155-9466, IranSolid State Lasers Research Group, Laser & Optics Research School, NSTRI, Tehran 11365-8486, IranDepartment of Material Science and Engineering, Sharif University of Technology, Tehran 11155-9466, IranTitanium dioxide nanopowders were synthesized by the diffusion controlled sol-gel process (LaMer model) and characterized by DTA-TG, XRD, and SEM. The prepared TiO2 nanoparticles have uniform size and morphology, and the phase transformation kinetics of obtained material was studied by interpretation of the X-ray diffraction patterns peaks on the base of Avrami equation. The stating point of anatase-rutile phase transformation temperature in the prepared nanoparticles was found between 100 and 200°C. A decreasing trend on the intensity of X-ray peaks of anatase phase was observed up to 600°C when the presence of the rutile phase became predominant. Results indicated that the transition kinetics of the diffusion controlled prepared nanoparticles was begun at low temperature, and it can be concluded that the nucleation and growth sites in these particles were more than other. However, it has been found that the nucleation activation energy of rutile phase was 20 kj/mol, and it is the lowest reported activation energy.http://dx.doi.org/10.1155/2010/626978 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
H. Mehranpour M. Askari M. Sasani Ghamsari H. Farzalibeik |
spellingShingle |
H. Mehranpour M. Askari M. Sasani Ghamsari H. Farzalibeik Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles Journal of Nanomaterials |
author_facet |
H. Mehranpour M. Askari M. Sasani Ghamsari H. Farzalibeik |
author_sort |
H. Mehranpour |
title |
Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles |
title_short |
Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles |
title_full |
Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles |
title_fullStr |
Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles |
title_full_unstemmed |
Study on the Phase Transformation Kinetics of Sol-Gel Drived TiO2 Nanoparticles |
title_sort |
study on the phase transformation kinetics of sol-gel drived tio2 nanoparticles |
publisher |
Hindawi Limited |
series |
Journal of Nanomaterials |
issn |
1687-4110 1687-4129 |
publishDate |
2010-01-01 |
description |
Titanium dioxide nanopowders were synthesized by the diffusion controlled sol-gel process (LaMer model) and characterized by DTA-TG, XRD, and SEM. The prepared TiO2 nanoparticles have uniform size and morphology, and the phase transformation kinetics of obtained material was studied by interpretation of the X-ray diffraction patterns peaks on the base of Avrami equation. The stating point of anatase-rutile phase transformation temperature in the prepared nanoparticles was found between 100 and 200°C. A decreasing trend on the intensity of X-ray peaks of anatase phase was observed up to 600°C when the presence of the rutile phase became predominant. Results indicated that the transition kinetics of the diffusion controlled prepared nanoparticles was begun at low temperature, and it can be concluded that the nucleation and growth sites in these particles were more than other. However, it has been found that the nucleation activation energy of rutile phase was 20 kj/mol, and it is the lowest reported activation energy. |
url |
http://dx.doi.org/10.1155/2010/626978 |
work_keys_str_mv |
AT hmehranpour studyonthephasetransformationkineticsofsolgeldrivedtio2nanoparticles AT maskari studyonthephasetransformationkineticsofsolgeldrivedtio2nanoparticles AT msasanighamsari studyonthephasetransformationkineticsofsolgeldrivedtio2nanoparticles AT hfarzalibeik studyonthephasetransformationkineticsofsolgeldrivedtio2nanoparticles |
_version_ |
1725906140157444096 |