METHOD FOR PRODUCING MAGNETITE-CONTAINING POROUS GLASS Russian patent published in 2023 - IPC C03C15/00 C03C23/00 B82Y25/00 B82Y40/00 

FIELD: nano-composites.

SUBSTANCE: technology of high-silica porous glasses - magnetic matrices, which can be used in the creation of new nanocomposite semiconductor materials for nano-, microelectronics and also as magnetic inorganic separating membranes for ultrafiltration required in medical and environmental technologies. Porous glasses are produced by through chemical etching of a two-phase sodium borosilicate glass containing 65-70 mol.% SiO₂ and 5-6 mol.% Na₂O, into which Fe₂O₃ is introduced in an amount of 6-8 mol.%. The original glass is synthesized by melting from the mixture at a temperature of 1400-1500°C depending on the content of SiO₂ for 2-3 hours followed by annealing at 530°C. For phase separation, glass is heat treated at 550°C within 24-96 hours. Two-phase glass is kept in an aqueous 3M hydrochloric acid solution while boiling and washed in distilled water. Next, combined drying is carried out in an air atmosphere at temperatures of 20÷120°C.

EFFECT: reducing resource and energy costs in the production of iron-containing porous glasses with a volumetric porosity of 35-40%, an average pore diameter of 4-5 nm in the form of plates with a thickness of ≤ 1 mm containing magnetite Fe₃O₄ with a crystallite size of ~ 20 nm.

3 cl, 11 dwg