FIELD: chemistry.
SUBSTANCE: invention can be used in chemical and electronic industries. Photonic-crystalline films based on monodispersed spherical silica particles are reinforced by immersing ready films into an alcohol nanosol of silica for a short period of time and then drying. The nanosol is prepared by mixing tetraethoxysilane with an aqueous solution of HCl at pH 1.5 and ethanol in ratio of 3.5:1:2.5. The mixture is held at 65-75°C for 1-2 hours. Cetyltrimethylammonium chloride is then added in amount of 200 mg per 3 ml of the sol. Before immersing the substrate with the photonic-crystalline film, the sol is diluted with ethanol in ratio of 1:10.
EFFECT: invention enables to obtain a photonic-crystalline film with Moh's hardness of 3,5-4 and mechanical strength comparable with strength of glass-like silica gel.
2 cl, 1 ex
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