The present article reports the in situ preparation of silver nanoparticles (AgNPs) homogeneously distributed in the formig gel matrix using only L-cysteine (CYS) as a bio-reducing agent. The complex of...

We report a new supramolecular hydrogel based on the simplest low molecular weight compounds – amino acid and silver salt. In situ formation of silver nanoparticles during self-assembly process shows...

The problem of the synthesis of a new generation of medicines aimed at combating bacteria and biofilms caused various infections is a great urgency. There is a gradual departure from...

With the use of two classes of reversible addition fragmentation chain transfer agentsdithiobenzoates and trithiocarbonates-multiblock copolymers based on styrene and n butyl acrylate, which are the best studied monomers in these processes, are synthesized. It is shown that the polymers containing dithiobenzoate and trithiocarbonate groups are highly efficient for the synthesis of block copolymers, which is independent of the number of stages at which the polymeric RAFT agents are used in polymerization: In all cases, the polymeric RAFT agent is fully consumed in the polymerization of the "alien" monomer. The mechanism governing chain formation during the synthesis of multiblock copolymers, that is, the character of monomer insertion into the polymer chain, via one or both ends, is studied. It is found that the order of monomer loading determines the ratio of chains growing through one or two ends. The thermal stability of amphiphilic multiblock copolymers, their solubility in various solvents, and self organizing ability are inves tigated.

The copolymerization of styrene and acrylic acid and the copolymerization of styrene and tert butyl acrylate that are mediated by benzyl dithiobenzoate and dibenzyl trithiocarbonate as reversible addi tion fragmentation chain transfer agents are studied for the first time. It is shown that the copolymerization of these monomer pairs mediated by reversible addition fragmentation chain transfer agents occurs via the pseudoliving radical mechanism and is characterized by a linear increase in the number average molecular weight with an increase in the total conversion of the monomers and by the formation of narrowly dispersed copolymers. Variation in the conditions of the radical copolymerization of styrene and acrylic acid (in the type of reversible addition fragmentation chain transfer agent and the addition of a polar solvent) and of the radical copolymerization of styrene and tert butyl acrylate (in the composition of the monomer mixture) makes it possible to control the chain microstructures of the copolymers.

We present a new and the most simple method for the preparation of a silver molybdate composite material with enhanced photocatalytic activity.

A comprehensive study to develop and create standard samples of the zeta potential unit of particles in a liquid in accordance with the requirements of GOST ISO 13099-2-2016 in the range of measured values from -150 mV to +150 mV was carried out. The existing standard samples of the zeta potential in Russia and the world have been investigated; an analysis of the applicability of the starting materials and components for the creation of new standard samples is given. Samples based on modifi ed polystyrene latex microspheres, bovine serum albumin and supramolecular systems based on aqueous solutions of L-cysteine, N-acetylcysteine, and silver acetate are considered as promising standard samples of the zeta potential of particles. All studies were carried out on equipment from the State Primary Standard of dispersed parameters of aerosols, suspensions and powder materials, GET 163-2020, by electrophoretic light scattering and pH measurement. It was found that polystyrene latex microspheres do not meet the requirements of the task in terms of developing a set of standard samples. Samples based on suspensions of bovine serum albumin do not meet the requirements of GOST ISO 13099-2-2016. Supramolecular systems based on aqueous solutions of L-cysteine, N-acetylcysteine, and silver acetate are proposed as standard samples. Such systems are characterized by the ability to modify the initial potential-determining layer of particles without changing their aggregate stability. Studies of the long-term stability of the developed standard samples of the zeta-potential unit of particles in a liquid have been carried out.

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