Abstract
A new method for preparing silica nanoparticles, which consists of a two-stage semi-batch/batch hydrolysis reaction of tetraethylorthosilicate (TEOS), is presented. A relatively slow rate of hydrolysis of the TEOS occurred during the semi-batch process, which resulted in larger silica particles with a narrower size distribution. This was in direct contrast to the batch process. An example of reduction in particle size for an initial semi-batch and subsequent batch reaction is shown. On completion of the initial semi-batch step, the silica particles had a diameter of 106 nm. As the subsequent batch reaction proceeded, the mean size of the particles decreased to 23 nm. In this work, it was found that the optimal conditions for the silica nanoparticles using this mixed method were as follows; (TEOS: 0.5 M, H2O: 6.0 M, NH4OH: 0.2 M, feed rate: 5.0 ml/min, temperature: 42.5°C). In conclusion, a mixedsemi-batch/batch system suggested a new probability for the synthesis of nanoparticles.
Similar content being viewed by others
References
J.G. Overbeek, Adv. Colloid Interface Sci. 15, 251 (1982).
G.R. Wiese and T.W. Healy, Trans. Faraday Soc. 66, 490 (1970).
K. Unger, J. Chromatogr. 61, 359 (1986).
M.D. Sacks and T.Y. Tseng, J. Am. Ceram. Soc. 67, 526 (1984).
G. Kolbe, Das Komplexchemische Verhalten der Kieselsäure (Dissertation, Jena, 1956).
W. Stober, A. Fink, and E. Bohn, J. Colloid Interface Sci. 26, 62 (1968).
V.A. Blaaderen, V.J. Geest, and A.J. Vrij, J. Colloid Interface Sci. 154, 481 (1992).
G.H. Bogush and C.F. Zukoski, J. Colloid Interface Sci. 142, 1 (1991).
T. Matsoukas and E. Gulari, J. Colloid Interface Sci. 132, 13 (1989).
H.S. Fogler, Elements of Chemical Reaction Engineering: Rate Laws and Stoichiometry (Prentice-Hall, Englewood Cliffs, NJ 1986), p. 59.
S.K. Park, K.D. Kim, and H.T. Kim, J. Ind. Eng. Chem. 6, 365 (2000).
T. Matsoukas and E. Gulari, J. Colloid Interface Sci. 124, 252 (1988).
K.D. Kim and H.T. Kim, J. Ind. Eng. Chem. 6, 281 (2000).
V.K. Lamer and R.H. Dinegar, J. Am. Chem. Soc. 72, 4847 (1950).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kim, K.D., Kim, H.T. Formation of Silica Nanoparticles by Hydrolysis of TEOS Using a Mixed Semi-Batch/Batch Method. Journal of Sol-Gel Science and Technology 25, 183–189 (2002). https://doi.org/10.1023/A:1020217105290
Issue Date:
DOI: https://doi.org/10.1023/A:1020217105290