Regularity of formation of polymer films based on chitosan modified with silver-containing nanoparticles
Abstract
The science of nanotechnology is actively developing, and one of its promising areas is research on the development of antibacterial drugs based on composites of inorganic silver particles and polymers. The results of the study of the effect of the concentration of chitosan solutions on the dimensional characteristics of silver-containing particles, their distribution on the surface of chitosan films, and the formation of structured films are presented. It is shown that in diluted chitosan solutions, the resulting dispersion of silver particles has a particle size of 12 nm and a narrow distribution. Increasing the concentration of chitosan to the crossover concentration leads to the formation of agglomerates up to 140 nm in size, consisting of small particles. Chitosan films filled with silver particles obtained from diluted and concentrated chitosan solutions are characterized by different distributions of silver particles on the film surface. The addition of pectin to chitosan resulted in the formation of a structured film with a uniform distribution of 15 nm silver particles on the surface. The surface structure of the film is also influenced by the formation of positively and negatively charged silver iodide nanoparticles. The Ag/I ratio of the particles obtained in the chitosan solution remains consistent during the film formation process.
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