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...

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

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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.

The authors of this work conducting a study of the precursor of reference materials of the zeta potential of particles in dispersed systems. The precursor is based on supramolecular solution of L-cysteine and silver acetate (CSSac). Particles and aggregates of CSSac were studied by dynamic light scattering (DLS), phase analysis of scattered radiation (PALS), inductively coupled plasma mass spectrometry (ICP-MS) and high-resolution transmission electron microscopy (HR-TEM). It was established that the diameter of the potential-determining aggregates of the CSSac is in the range from 20 nm to 100 nm. These aggregates consist of nanoparticles up to 10 nm in diameter.

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