Water-dispersible nanocomposites of fullerene C60 and polymer-stabilized silver nanoparticles: preparation, physico-chemical properties, antifungal activityстатьяИсследовательская статья
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Аннотация:A simple method of obtaining composites based on fullerene and silver nanoparticles (AgNPs) has been proposed. Non-covalent water-dispersible composites were prepared by mixing water solution of polymer-stabilized AgNPs and solution of pristine fullerene C60 in N-methylpyrrolidone (NMP), followed by exhaustive dialysis against water. Alternating copolymers of dicarboxylic acid were used as stabilizing copolymers in the complexes of AgNPs: poly(styrene-alt-maleic acid) - SM, poly(N-vinyl-2-pyrrolidone-alt-maleic acid) -VM or poly(ethylene-alt-maleic acid) -EM. A 5-6-fold molar excess of copolymer/AgNPs - complexes SM/Ag0 or VM/Ag0 and the approximately 10-fold excess of EM/Ag0 was used relative to C60 (moles of copolymers corresponded to containing AgNPs dimer units of copolymers). The volume of the aqueous phase when preparing composites was correlated with organic as 1 to 1 - 1.3. The physical and optical properties of the preparations were characterized by UV-Vis and FTIR spectroscopies, DLS, TGA, TEM and XPS. It has been shown that fullerene is included into the composites in solvated form. The AgNPs content in the composites was 22-34, and C60 - 20-28 wt.%. The dry composites were found to be dispersible in water, but were practically insoluble and did not dissociate in nonpolar solvents and NMP. It has been shown that C60 significantly inhibits the oxidative degradation of AgNPs in the composites and increases the antifungal activity of the preparations against Candida albicans
