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Effect of Vapor Pressure of H2O on the Formation of Nano-Crystalline TiO2 Ultrafine Powders

Published online by Cambridge University Press:  21 February 2011

K. R. Lee ,
S. J. Kim ,
J. S. Song  and
S. Park
K. R. Lee
Affiliation:
Dept. of Ceramic Eng., Myong-Ji University, Yongin, 449-728
S. J. Kim
Affiliation:
KAERI, Yusong, Taejon, 05-600
J. S. Song
Affiliation:
KERI, Changwon, 641-120, OK
S. Park
Affiliation:
Dept. of Ceramic Eng., Myong-Ji University, Yongin, 449-728, spark@wh.myongji.ac.kr
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Abstract

Mono-dispersed TiO2 ultrafme particles with diameters 40-400nm were obtained from aqueous TiOCl2 solution with 0.67M Ti4+ concentration prepared diluting TiCl4 by homogeneous precipitation process in the ranges of 17-230°C. With the spontaneous hydrolysis of TiOCl2, which means the natural decrease of pH value in the aqueous solution, all mono-dispersed precipitates were crystallized with the anatase or rutile TiO2 phase. TiO2 precipitate with the pure rutile phase was fully formed at the temperatures below 65 °C, not involving the evaporation of H2O, and above 155 °C, which were available by suppressing it. TiO2 precipitate with rutile phase including a small amount of the anatase phase started to be formed in the intermediate temperatures above 70 °C showing the full formation of the anatase above 95 °C under the free evaporation of H2O. However, in the case of completely suppressing H2O evaporation at the temperatures above 70°C, TiO2 precipitate with anatase phase was fully transformed into the precipitate with the rutile phase by the vapor pressure of H2O. Therefore, the formation of TiO2 precipitates with the rutile phase around room temperature would be caused due to the existence of the capillary pressure between the agglomerated needle-shaped particles or the ultrafme clusters, together with the slow reaction rate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 33
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

1. Siefering, K.L. and , Griffin, J. Electrochem. Soc. 137, p. 814 (1990).Google Scholar
2. Fuyuki, T. and Matsunami, H., Jpn. J. Appl. Phys. 25, p. 1,288 (1986).Google Scholar
3. Bally, A., Prasad, K., Sanjines, R., Schmid, P.E., Levy, F., Benoit, J., Barthou, C., and Benalloul, P., Mat. Res. Soc. Symp. 424, p. 471 (1997).Google Scholar
4. Prasad, K., Bally, A.R., Schmid, P.E., Levy, F., Benoit, J., Barthou, C. and Benalloul, P., Jpn. J. Appl. Phys. 36, p. 5,696 (1997).Google Scholar
5. Ono, Y. A. in Electorluminescent Displays, edited by Chief Ong, Hiap L. (World Scientific Pub. Co. Ltd, Singapore 1995), p.10–13.Google Scholar
6. Santacesaria, E., Tonello, M., storti, G., Pace, R.C. and Carra, S., J. Colloid and interface Science 111, p. 44 (1986).Google Scholar
7. , Matijevic, Budnik, M., and Meites, L., J. Colloid and interface Science 61, p. 302 (1977).Google Scholar
8. Ding, Xing-Zhao, Qi, Zhen-Zhong and He, Yi-Zhen, J. Mat, Sci. Lett. 14, p. 21 (1995).Google Scholar
9. Akhtar, M.K., Xiong, Y and Pratsinis, S.E., AIChE Journal, 37, p. 1,561 (1991).Google Scholar
10. Barringer, E.A., and Bowen, H.K., Langmuir 1, p. 414 (1985).Google Scholar
11. Park, S., Kim, S. J., Park, S. D. and Jeong, Y. H., J. Am. Ceram. Soc. 82, p. 927 (1999).Google Scholar
12. Park, S., Nam, H. D., Lee, B. H., Kim, S. J., Jung, C. H. and Lee, J. H., Jpn. J. Appl. Phys. 37, p. 4,603 (1998).Google Scholar
13. , Krishnankutty-Nair Kumar, P., Scripta Metallurgica et Materialia 32, p. 873 (1995).Google Scholar
14. Zhang, H. and Banfield, J. F., J. Mater. Chem. 8, p. 2073 (1998).Google Scholar