Conclusions
A complex experiment has been carried out to examine the vibrational spectrum of Aerosil, and it has been found that the silanol group is the main active center of this type of dispersed silica. This fact conforms well with the previously advanced supposition that the structure of the core of silica is of a closed type in this case.
The experimentally measured vibrational spectrum of the adsorbed water is practically completely described by a model in which one silanol center reacts with a water cluster. This agrees with the fact that chemical hydrophobic reactions take place on the surface of the usual commercial, i.e.,wet Aerosil. Since water is adsorbed as a cluster around one center, then in the presence of the usual 2. wt. % of water, a large part of the surface will be free of water and available for other reactions.
It is natural that the above-considered simple models do not permit explanation of all the details of the observed spectra and a large amount of work will have to be carried out with more complicated models.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature Cited
K. V. Gavrilyuk, Yu. I. Gorlov, M. M. Konoplya, et al., Teor. Éksp. Khim.,15, 212–216 (1979).
Yu. I. Gorlov, V. G. Golovatyi, M. M. Konoplya, et al., Teor. Éksp. Khim.,16, 202–207 (1980).
M. M. Konoplya and Yu. I. Gorlov, Teor, Éksp. Khim.,16, 166–173 (1980).
V. I. Lygin and I. A. Lygina, Zh. Fiz. Khim.,59, 1180–1192 (1985).
Yu. I. Gorlov, V. A. Zaets, and A. A. Chuiko, Teor. Éksp. Khim.,24, 532–546 (1988).
V. I. Lygin, Zh. Fiz. Khim.,63, 289–305 (1989).
E. F. Sheka, I. Natkaniec, V. D. Khavryuchenko (Khavryutchenko), et al., J. Electr. Spect. Rel. Phenom.,54/55 855–876 (1990).
I. I. Gurevich and L. V. Tarasov, Physics of Low Energy Neutrons [in Russian], Fizmatgiz, Moscow (1965).
E. F. Sheka, 6-th International Conference on Vibrations at Surfaces, Sept. 10–14 (1990), TUPC9, Shelter Island (1990).
G. Baluka, A. Belushkin, S. Bragin, et al., Communications of the Joint Institute for Nuclear Research, P13-84-242, Dubna (1984).
C. Duncan and V. I. Lygin, Quantum Chemistry of Adsorption on the Surface of Solid Bodies [in Russian], Mir, Moscow (1980).
V. A. Zaets, CLUSTER-Z1: Complex of Programs for Computational Chemistry [in Russian], Institute of Surface Chemistry, Ukrainian Academy of Sciences, Kiev (1990).
G. Fogarasi and P. Pulai, J. Mol. Str.,141, 145–149 (1986).
V. D. Khavryuchenko, COSPECO: Complex of Programs for Computational Vibrational Spectroscopy [in Russian], Institute of Surface Chemistry, Ukrainian Academy of Sciences, Kiev (1990).
R. K. Iler, The Chemistry of Silica, Wiley, N. Y. (1979).
R. J. Klier, Colloid Interface Sci.,58, 215–222 (1977).
Additional information
Patrice Lumumba Peoples's Friendship University, Institute of Surface Chemistry, Ukrainian Academy of Sciences. Joint Institute of Nuclear Research. Translated from Zhurnal Strukturnoi Khimii, Vol. 33, No. 4, pp. 66–75, July–August, 1992.
Rights and permissions
About this article
Cite this article
Sheka, E.F., Khavryuchenko, V.D., Natkanets, I. et al. Vibrational spectroscopy of dispersed silica: Aerosil. J Struct Chem 33, 536–544 (1993). https://doi.org/10.1007/BF00746931
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00746931