Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 11, pp. 1934−1938.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
B.B. Troitskii, A.A. Babin, Yu.A. Mamaev, M.A. Lopatin, V.N. Denisova, M.A. Novikova, L.V. Khokhlova, 2009, published in Zhurnal
Prikladnoi Khimii, 2009, Vol. 82, No. 11, pp. 1785−1789.
AND POLYMERIC MATERIALS
Modiﬁ ed Sol-Gel Method for Synthesis of Mesoporous Silicon
Dioxide and Study of the Optical Properties of Antireﬂ ection
Coatings Based on This Material
B. B. Troitskii
, A. A. Babin
, Yu. A. Mamaev
, M. A. Lopatin
, V. N. Denisova
M. A. Novikova
, and L. V. Khokhlova
Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhni Novgorod, Russia
Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, Russia
Received September 24, 2008
Abstract—The kinetics of sedimentation of aqueous kaolin dispersion in the presence of multicomponent
ﬂ occulating additives was studied. Binary and ternary mixtures based on poly-1,2-dimethyl-5-vinylpyridinium
methyl sulfate, poly-N,N-dimethyl-N,N-diallylammonium chloride, and poly-N,N,N-trimethyl-N-
methacryloyloxyethylammonium methyl sulfate were used as ﬂ occulants. The synergistic effect of the cationic
polyelectrolytes in such multicomponent systems was revealed.
Antireﬂ ection coatings with a low refractive index
(1.23–1.24), based on mesoporous silicon dioxide, were
produced by using oligomers of Laprol brand in the sol-
gel process. The relationship between the concentration
of laprols in the sol and the maximum antireﬂ ection effect
of the resulting transparent ﬁ lm was studied.
The host synthesis of mesoporous silicates and
aluminosilicates was discovered in 1992 [1–3] and
has been intensively developed since that time [4, 5].
The sol-gel method has been used to synthesize, in the
presence of surfactants (ionogenic and nonionogenic) and
amphiphilic block-copolymers, mesoporous materials
both as powders and as transparent ﬁ lm coatings with low
refractive index (1.20), which exhibit a high antireﬂ ection
In 1997, studies were commenced [9, 10] devoted to
synthesis of mesoporous materials by the sol-gel method
with addition of organic oxyacids, compounds that are
not surfactants or block-copolymers. Advances have been
made in syntheses of mesoporous silicon dioxide powders
for use in catalysis .
Previously, the sol-gel method has been used to obtain,
in the presence of organic compounds belonging to the
class of organic acids  or to the class of carbochain
polymers and statistical copolymers  (these
compounds are not low-molecular-weight surfactants or
high-molecular-weight surfactants, amphiphilic block-
copolymers), transparent mesoporous silicon dioxide
ﬁ lm coatings with a low refractive index (1.25–1.34)
and a pronounced antireﬂ ection effect [12, 13].
The aim of this study was to produce transparent thin
ﬁ lms of mesoporous silicon dioxide on a silicate glass
by the sol-gel method with addition of another class
of organic compounds, oligoesters, and to study the
antireﬂ ection effects of these ﬁ lms.
Tetraethoxysilane (TEOS) was purified by triple
distillation in a vacuum, with the content of the main
substance 99.9% (found by liquid chromatography).
Isopropanol and secondary butanol of chemically pure
grade, twice-distilled water, and hydrochloric acid of
chemically pure grade were used in the study.
As oligoester derivatives based on oxyethylene and