Modeling the Process of Synthesis of Nanoparticles into Fibrous Materials by the Method of Chemical Reduction
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Fibre Chemistry, Vol. 52, No. 3, September, 2020 (Russian Original No. 3, May-June, 2020)
MODELING THE PROCESS OF SYNTHESIS OF NANOPARTICLES INTO FIBROUS MATERIALS BY THE METHOD OF CHEMICAL REDUCTION O. I. Yakovleva,* E. S. Sashina,* and S. A. Vakulenko**
UDC 541.123.38
Silk fibers served as a matrix for the reduction of nanoparticles from a silver salt solution. A mathematical model describing the dependence of the total content of reduced silver on a fiber Y on the input parameters X1, X2, X3, X4 (silver concentration in the treatment solution, concentration of reducing agent, temperature and duration of the reduction process, respectively) is constructed. A chemically substantiated nonlinear regression model and a two-layer perceptron are proposed, which make it possible to obtain mathematical expressions for the dependence of the silver content on silk fibers on the input parameters. Both models adequately reflect the experimental data – the error of the regression model is 0.16, the error of the two-layer perceptron is 0.14.
Modern technologies make it possible to obtain a wide range of fibrous materials with new properties by introducing various types of nanoparticles into them. The introduction of metal particles into polymer matrices is achieved by various methods, one of the most well-known methods is the reduction of metal ions from salt solutions. Many fibrous nanocomposites (fibers, fabrics, nonwovens, etc.) containing stabilized nanoparticles of copper, nickel, platinum, palladium, and silver have been obtained in recent years. Nanoparticles are obtained on cellulose, viscose, polyester, polyethylene, polypropylene, silk, wool and mixed textile materials and fibers [1-4]. Most of the scientific literature on antimicrobial textile nanocomposites is devoted to the introduction of silver particles. Silver has a bactericidal, antiviral, pronounced antifungal and antiseptic effect and serves as a disinfectant against pathogenic microorganisms that cause acute infections [5-8]. It is believed that silver nanoparticles penetrate the bacterial cell wall and cause its damage due to binding to sulfur and phosphorus-containing DNA regions. A common method for the preparation of fibrous nanocomposites is the impregnation of fibrous materials with a prepared solution of nanoparticles, which additionally contains a stabilizer to prevent agglomeration. Another method involves the chemical reduction of metal ions sorbed in the structure of the fibrous material, when treated with solutions of metal salts. In this case, the size of nanoparticles depends on the pore size of the fiber; some of the metal is reduced and retained on the surface. We have previously [9-11] studied the effect of reducing agents of different nature (hydrazine sulfate, metol, sodium borohydride, and sodium hypophosphite) on the size of silver nanoparticles on natural silk fibers. It was shown in [9] that the reduction with sodium borohydride promotes the formation of particles with a size of 5 to 50 nm on the fiber surface, while the overall
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