Abstract
A series of organically modified silica gels (ORMOSILs) with different alkyl groups such as methyl, ethyl, propyl, phenyl and octyl groups was investigated to determine the effect of substituted alkyl groups on the textural properties such as surface area, total pore volume, microporosity and hydrophobicity. Gelation time increased with increasing volume of alkyl groups. As-synthesized xerogels showed a systematic decrease in surface areas and total pore volumes and increase in microporosities with an increase in the volume of alkyl groups. All the ORMOSILs exhibited similar surface areas and total pore volumes after calcination at 500°C for 1 d. Increase in microporosities was observed in all the calcined xerogels. This study suggests that the primary particle sizes of pure silica cores are not affected by the size of the alkyl group, while their connectivity decreases with increasing volume of alkyl groups in the acid–base catalysed system of alkyltrimethoxysilane–tetramethylorthosilicate.
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C. V. Santilli, N. L. D. Filho, S. H. Pulcinelli, J. C. Moreira and Y. Gushikem, J. Mater. Sci. Lett. 15 (1996) 1450.
K. C. Vrancken, P. V. D. Voort, K. Possemiers and E. F. Vansant, J. Coll. Interface Sci. 174 (1995) 86.
M. L. Menezes, J. C. Moreira and J. T. S. Campus, ibid. 179 (1996) 207.
J. Wen, K. Jordens and G. L. Wilkes, in “Better Ceramics through Chemistry VII”, edited byB. K. Coltrain, C. Sanchez, D. W. Schaefer and G. L. Wilkes, Materials Research Society Symposium Proceedings 435 (Materials Research Society, Pittsburgh, 1996) p. 207.
C. Liu, H. Z. Chen, S. Komarneni and C. G. Pantano, J. Porous Mater. 2 (1996) 245.
B. M. De witte, D. Commers and J. B. Uytter-hoeven, J. Non-Cryst. Solids 202 (1996) 357.
N. K. Raman, S. Wallace and J. Brinker, in “Better Ceramics through Chemistry VII”, edited byB. K. Coltrain, C. Sanchez, D. W. Schaefer and G. L. Wilkes, Materials Research Society Symposium Proceedings 435 (Materials Research Society, Pittsburgh, 1996) p. 357
M. J. van Bommel, T. N. M. Bernards and A. H. Boonstra, J. Non-Cryst. Solids 128 (1991) 231.
M. J. Van bommel, T. N. M. Bernards, E. W. J. L. Oomen and A. H. Boonstra, ibid. 147/148 (1992) 80.
S. Prabakar and R. A. Assink, in “Better Ceramics through Chemistry VII”, edited byB. K. Coltrain, C. Sanchez, D. W. Schaefer and G. L. Wilkes, Materials Research Society Symposium Proceedings 435 (Materials Research Society, Pittsburgh, 1996) p. 345.
T. M. Alam, R. A. Assink and D. A. Loy, ibid. p. 421.
H. Schmidt, H. Scholze and A. Kaiser, J. Non-Cryst. Solids 63 (1984) 1.
S. Prabakar and R. A. Assink, ibid. 211 (1997) 39.
S. K. Mah and I. J. Chung, ibid. 183 (1995) 252.
F. Schwertfeger, W. Glaubitt and U. Schubert ibid. 145 (1992) 85.
W. G. Fahrenholtz and D. M. Smith, in “Better Ceramics through Chemistry V”, edited byM. J. Hampden-Smith, W. G. Klemperer and C. J. Brinker, Materials Research Society Symposium Proceedings 271 (Materials Research Society, Pittsburgh, 1992) p. 705.
C. J. Brinker and G. W. Scherer, “Sol-Gel Science” (Academic Press, New York, 1990) Ch. 3.
V. C. Menon, S. Komarneni, M. Park, M. SchmÜcker and H. Schneider, J. Sol-Gel Sci. Technol. 11 (1998) 7.
C. Liu and S. Komarneni, in “Advances in Porous Materials”, edited byS. Komarneni, D. M. Smith and J. S. Beck, Materials Research Society Symposium Proceedings 371 (Materials Research Society, Pittsburgh, 1996) p. 217.
G. Cao, Y. Lu, L. Delattre, C. J. Brinker and G. P. LÓpez, Adv. Mater. 8 (1996) 588.
M. Yamane, S. Aso, S. Okano and T. Sakaino, J. Mater. Sci. 14 (1979) 607.
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Park, M., Komarneni, S. & Choi, J. Effect of substituted alkyl groups on textural properties of ORMOSILs. Journal of Materials Science 33, 3817–3821 (1998). https://doi.org/10.1023/A:1004635031973
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DOI: https://doi.org/10.1023/A:1004635031973