Abstract
Currently, colloidal silver particles are used in the creation of electronic, optical, and sensor devices of a new generation. Silver-containing bionanocomposites (BNCs) were synthesized by immobilization of colloidal montmorillonite particles containing colloidal silver in a composition of sodium alginate and sodium salt of carboxymethylcellulose. Silver-containing montmorillonite particles Ag-Mt were obtained by replacing Na+ ions in layered silicate galleries with Ag+ ions, followed by the transformation of silver ions into silver particles. The introduction of Ag+ ions into the montmorillonite structure is justified by infrared spectroscopy. When studying the strength of bionanocomposite films, it was found that with an increase in the content of Ag-Mt particles in their composition, the strength increases and the deformation decreases.It is found that the equilibrium values of the swelling constant are set in ~30 minutes. At the same time, with an increase in the Ag-Mt content in the bionanocomposite from 3 % to 10 %, the value of the equilibrium swelling coefficient (Kswell) decreases by 2.8 times. The replacement of Na+ ions with Ag+ ions in the montmorillonite structure is accompanied by a decrease in the swelling of bionanocomposites, which is explained by the lower hydration of Ag+ ions compared to Na+ ions. As another reason for the decrease in the swelling of bimonanocomposites with an increase in the proportion of Ag-Mt in their composition, enhancing their ability to structure formation in the prersence of a clay mineral is indicated.The kinetics of the release of Ag+ ions from bionanocomposites into saline has been studied. It is shown that the release of Ag+ ions increases with increasing pH of the medium
Highlights
Metal nanoparticles have been widely used in biotechnology, pharmacy, powder metallurgy and other innovative technologies
The biological activity is shown not by molecules, but by silver ions, which attack various protein objects in the cell and affect intracellular processes. This valuable property of Ag+ ions allows them to fight against pathogenic bacteria that are highly resistant to narrow-acting antibiotics [2]
We studied the effect of Ag-Mt concentration in bionanocomposites on their strength and elongation at break (Table 2)
Summary
Metal nanoparticles have been widely used in biotechnology, pharmacy, powder metallurgy and other innovative technologies. Colloidal silver particles possess valuable properties – unique optical properties due to surface plasma resonance, a highly specific surface area, catalytic activity, high-capacitance electric double layer, etc. The biological activity is shown not by molecules, but by silver ions, which attack various protein objects in the cell and affect intracellular processes. This valuable property of Ag+ ions allows them to fight against pathogenic bacteria that are highly resistant to narrow-acting antibiotics [2]. An increase in the specific surface area of metallic silver leads to an increase in the concentration of Ag+ ions released from it. Obtaining composites of silver ions with various mineral and organic carriers is an urgent problem of modern bionanotechnology
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