Journal
CERAMICS INTERNATIONAL
Volume 34, Issue 7, Pages 1623-1627Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2007.07.009
Keywords
silica colloid; secondary nucleation; critical specific surface area
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Funding
- National Science Council [NSC 92-2214-E-007-018]
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In this work, we determined experimentally the critical total surface area of silica seeds in the solution to avoid the fort-nation of new particles (i.e. secondary nucleation) in a batch Stober growth process. This critical surface area corresponded to the balance between the generation rate of reaction intermediate from the hydrolysis of TEOS and its consumption rate via the growth of existing seeds. Further calculation showed that the secondary nucleation was probably related to the average distance between seed particles. When the distance between seeds exceeded a critical value for each growth condition, i.e. for each generation rate, one would then observe secondary nucleation. Otherwise, simple growth was observed. Higher generation rate corresponded to shorter distance. (C) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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