COLLOIDAL SOLUTION OF SILVER NANOPARTICLES, METAL-POLYMER NANOCOMPOSITE FILM MATERIAL, METHODS FOR PRODUCTION THEREOF, BACTERICIDAL COMPOSITION BASED ON COLLOIDAL SOLUTION AND BACTERICIDAL FILM MADE FROM METAL-POLYMER MATERIAL Russian patent published in 2013 - IPC B01J13/00 C09D1/00 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention can be used as a sterilising medium or an antibacterial component, particularly when making bactericidal liquid plaster, a component when producing materials for restoration of bones and other body tissue in restorative medicine, film material as a bactericidal, nontoxic, biodegradable coating on wounds, burns etc. The colloidal solution and film material can also be used in electronics and optoelectronic applications. The method of producing the colloidal solution of silver nanoparticles involves dissolving AgNO₃ and a stabiliser polymer - carboxymethyl chitin in concentration of 0.1-3 wt % in water and concentration of AgNO₃ 3.5-10.1 mM in carboxymethyl chitin solution, bubbling inert gas through the layer of solution and gamma-ray exposure of the solution with a dose of 2-12 kGy with reduction of silver ions to silver nanoparticles. Before bubbling, isopropyl alcohol or ethanol or ethylene glycol is added to the obtained solution. The invention also relates to a colloidal solution of silver nanoparticles obtained using said method, and a bactericidal composition based thereon. To obtain a metal-polymer nanocomposite film material from a colloidal solution of silver nanoparticles, a solution of carboxymethyl chitin in concentration of 2-4 wt % is added and the nanocomposite film material is obtained by moulding and removing water by evaporation until achieving moisture content of 10 wt %. The invention also relates to a film material obtained using said method and a bactericidal film made therefrom.

EFFECT: obtaining size- and shape-homogeneous silver nanoparticles, high bactericidal activity, especially with respect to Salmonella typhimurium and Staphilococcus aureus strains with possibility of maintaining flow of oxygen into a wound area to be healed, accelerates repair and epithelialisation processes, accelerates biodegradation of material up to full decomposition thereof on the healed surface, which enables to prevent the injurious procedure of removing the film.

7 cl, 2 tbl, 9 ex, 10 dwg