Abstract
The structure of silica gels prepared by hydrolysis of tetraethoxysilane (TEOS) with high acid content has been investigated. The gels were obtained by varying the nitric acid contents at a constant H2O/TEOS molar ratio of 10. The molar compositions were TEOS: H2O∶HNO3 =1∶10: x(x=0.1–1.0). The effects of acid content and drying temperature on structural changes in the gels were examined. In addition, the surface area, pore volume, pore size distribution, and the microstructure were determined. The results showed that the pore structure changed to larger pore sizes and broader size distributions as a result of increasing the drying temperature. However, at a constant drying temperature, a higher acid content yielded a higher pore volume. The gels dried at lower temperatures had slit-shaped micropores and a narrow pore size distribution; whereas, the gels dried at higher temperatures had ink bottle-shaped pores and a relatively broad size distribution.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M.Guglielmi and G.Carturan, J. Non-Cryst. Solids 100 (1988) 16.
C. J.Brinker and G. W.Scherer, in “Ultrastructure Processing of Ceramic Glasses and Composites”, edited by L. L. Hench and D. R. Ulrich (Wiley, New York, 1984) p. 43.
C. J.Brinker, J. Non-Cryst. Solids 100 (1988) 31.
A.Yasumori, H.Kawazoe and M.Yamane, 100 (1988) 215.
J.Zarzycki, M.Prassas and J.Phalippou, J. Mater. Sci. 17 (1982) 3371.
J.Zarzycki, in “Ultrastructure Processing of Ceramic Glasses and Composites”, edited by L. L. Hench and D. R. Ulrich (Wiley, New York, 1984) p. 27.
L. C.Klein and G. J.Garvey, in “Ultrastructure Processing of Ceramic Glasses and Composites”, edited by L. L. Hench and D. R. Ulrich (Wiley, New York, 1984) p. 88.
L. L.Hench, in “Science of Ceramic Chemical Processing”, edited by L. L. Hench and D. R. Ulrich (Wiley, New York, 1986) p. 52.
K. T.Chou and B. I.Lee, Ceram. Int. 19 (1993) 315.
B. L.Lippens and J. H.deBoer, J. Catal. 4 (1965) 319.
S.Brunauer, L. S.Deming, W. S.Deming and E.Teller, J. Amer. Chem. Soc. 62 (1940) 1723.
A.Bertoluzza, C.Fagnano, M. A.Morelli, V.Gottardi and M. Guglielmi, J. Non-Cryst. Solids 48 (1982) 117.
M.Pauthe, J.Phalippou, R.Corriu, D.Leclercq and A.Vioux, 113 (1989) 21.
G.Orcel, G. J.Phalippou and L. L.Hench, 88 (1986) 114.
E.Lippincott, A. V.Valkenburg, C. E.Weir and E. N.Bunting, J. Res. Nat. Bur. Stand. 61 (1958) 61.
S.Lowell and J. E.Shields, “Powder Surface Area and Porosity” (Chapman and Hall Ltd, New York, 1984) p. 11.
C. J.Brinker and G. W.Scherer, “Sol-Gel Science, the Physics and Chemistry of Sol-Gel Processing” (Academic Press Inc., New York, 1990) p. 524.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lee, B.I., Chou, K. Processing effect on structural changes of high acid-catalysed silica gel. JOURNAL OF MATERIALS SCIENCE 31, 1367–1373 (1996). https://doi.org/10.1007/BF00353119
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00353119