L. V. Khokhlova

Poly(propylene glycols) as effective additives to the sol-gel process in fabrication of antireflection coatings onto silica glass

Possibility of obtaining mesoporous silicon dioxide antireflection coatings with low refractive index (1.20–1.277) by using additions of poly(propylene glycols) with various molecular masses in a sol-gel process was examined. It was demonstrated that the optimal concentration of poly(propylene glycols) in the sol, at which a sol-gel process followed by heating of a sample yields a transparent film with a maximum light transmission of 98.3–99.0%, depends on the average molecular mass of the additive.

Preparation of antireflection coatings from silicon dioxide on glass and quartz by the sol-gel method with oligoethers

Antireflection coatings with a low refractive index (1.18–1.23) have been prepared on silicate glass and optical quartz from mesoporous silicon dioxide synthesized by the sol-gel method in the presence of oligoethers. The optimum concentration of the oligoester in the sol is equal to 1.5–2.5 wt %. For the single-layer double-sided coating, the maximum transmission is equal to 99.0% for the silicate glass and 99.9% for quartz.

Deposition of thin antireflection coatings based on mesoporous silicon dioxide by the sol-gel method in the presence of carbochain polymers and statistical copolymers

Antireflection coatings with a low refractive index (1.25–1.34) were prepared from mesoporous silicon dioxide by using carbochain polymers and statistical copolymers, instead of ionogenic and noionogenic surfactants and amphiphilic block-copolymers in a sol-gel process. The optimal concentration of the organic additive in the sol, at which a transparent film with the maximum antireflection effect is formed in the sol-gel process followed by heating of a sample, was determined.

Influence of the synthesis conditions of emulsion poly(methyl methacrylate) on the surface structure of the specimens

The surface structure of poly(methyl methacrylate) specimens prepared by emulsifier-free emulsion polymerization of methyl methacrylate was examined in relation to the synthesis conditions (pH of the medium, initiator concentration, and addition of organosilicon compounds).

New antireflection coatings on silicate glass, deposited from a silicon dioxide sol containing a nonionogenic surfactant and an oligoether based on ethylene oxide

Transparent nanoporous thin films with low refractive index (1.23–1.25) were produced on glass substrates by application of a formulation based on a silicon dioxide sol into which two organic compounds, an oligoether based on ethylene oxide and a nonionogenic surfactant, are introduced. It is shown that the antireflection capacity of the nanoporous coating can be substantially raised at comparatively low concentrations of silicon dioxide and organic additives in the sol by making higher the rate at which the formulation is applied to the substrate.

Obtaining antireflecting coatings from mesoporous silicon dioxide on silicate glass at lowered temperatures of baking of gel

Silicon dioxide sol with oligoethers can be used to obtain antireflecting coatings on silicate glass at various baking temperatures of the coating: 400, 300, and 200°C. At an optimal concentration of 4.0 mass % of oligoether based on PPG-725 in a sol, the maximum light transmission of 99.7%, and the refractive index of the nanoporous coating of 1.23 do not depend on the baking temperature in the range from 200 to 400°C. Silicon dioxide sol with a 4.0 mass % of ALM-10 give a maximum light transmission of 99.7% and a refractive index of the nanoporous coating of 1.23 at a baking temperature of 300–400°C. A maximum light transmission of the glass with a coating of 98.7% and the refractive index of 1.27 at an optimal concentration of 8.0 mass % of oligoether based on PEG-200 were obtained at baking temperatures of 300–400°C.

Deposition of antireflection coatings onto silicate glass from a silicon dioxide sol containing a nonionogenic surfactant and oligoester based on propylene oxide

Possibility of obtaining low-refractive-index antireflection coatings composed of mesoporous silicon dioxide by simultaneous introduction of two organic compounds, oligoester based on propylene oxide and a nonionogenic surfactant, into a silicon dioxide sol was studied.

Antireflection coatings produced on silicate glass from silicon dioxide sols with addition of poly(propylene glycols) at gel annealing temperature of 200°C

Thin transparent nanoporous silicon dioxide films with low refractive index (1.26–1.30) were formed on a glass substrate by deposition of a formulation that is based on silicon dioxide sol with addition of poly(propylene glycols) at a low gel annealing temperature of 200°C. The maximum optical transmission of glass with these antireflection coatings is 97.5–98.7%.

Features of high-temperature thermal oxidative degradation of organic-inorganic compositions based on poly(methyl methacrylate) with tetrabutoxytitanium

Thermal oxidative degradation of organic-inorganic compositions based on poly(methyl methacrylate) and the methyl methacrylate-methyl acrylate copolymer with tetrabutoxytitanium was studied by thermo-gravimetric methods.

Modified sol-gel method for synthesis of mesoporous silicon dioxide and study of the optical properties of antireflection coatings based on this material

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-Nmethacryloyloxyethylammonium methyl sulfate were used as flocculants. The synergistic effect of the cationic polyelectrolytes in such multicomponent systems was revealed.