Formation of Silver Nanoparticles via Reduction of Their Sparingly Soluble Precursors
- PDF / 867,062 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 93 Downloads / 177 Views
ation of Silver Nanoparticles via Reduction of Their Sparingly Soluble Precursors N. S. Dymnikovaa,*, E. V. Erokhinaa, A. P. Moryganova, and O. Yu. Kuznetsovb,** a Krestov b Ivanovo
Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, 153045 Russia State Medical Academy, Ministry of Health of the Russian Federation, Ivanovo, 153012 Russia e-mail: *[email protected]; **[email protected] Received October 5, 2018; revised September 7, 2020; accepted September 17, 2020
Abstract—The process of synthesis of ultradisperse silver particles by the reduction of silver salts differing in solubility by 5–40 orders of magnitude was studied by spectrophotometry, dynamic light scattering, and visual observation. The solubility of the precursor salt was shown to significantly affect the silver reduction rate. Examination by photon correlation spectroscopy confirmed the formation, upon completion of the reduction reaction, of silver nanoparticles with ~20 nm hydrodynamic radius, including the stabilizer shell. The biological activity of the sols synthesized against test cultures such as Staphylococcus aureus, Escherichia coli, and Candida albicans was assessed, and its dependence on the size of the particles formed was revealed. For the textile materials doped with the sols synthesized, the resistance to the action of the natural complex of microflora and of soil microflora was studied depending on the solubility of the precursor salts and on the size of the particles formed. Keywords: sparingly soluble silver salts, synthesis, silver nanoparticles, antimicrobial activity
DOI: 10.1134/S1070363220090340 INTRODUCTION An efficient approach to fighting the growing emergence and spread of drug-resistant microorganisms involves expansion of the range of innovative textile materials modified with bioactive metal nanoparticles (NPs). The biocidal effect produced by the modified materials depends on the NP size, which seems logical, since dispersion provides for a larger area of contact between the metal and the surface of microbial cell and thereby a more effective action thereon. Having 25% of the tested surface is seen by naked eye.
An increase in the diameter of the zone around the samples with ≤ 30 nm particle sizes proves a higher efficiency of the agent. The silver sols synthesized were tested for their efficiency in providing cellulose-containing textile materials with resistance to biodegraders. The materials were doped with the corresponding sols for 10 min at a temperature of 30±1°C, then squeezed out in a laboratory setup to the residual solution content of 100%, and dried. Cultivation of the natural complex of microflora was provided by keeping the fabric in a TS-80 thermostat at 29±0.2°C and of 98–100% humidity for 14 days. Table 3 presents the quantitative data characterizing the protection of the Tarpaulin gray cloth against biodegraders.
Upon cultivation of the natural complex of microflora the untreated fabric exhibited a high degree of mold growth (5 points), acquired a specific (putrid) odor, and lost up
Data Loading...
