Vol 17, No 6 (2024)

In this work, the synthesis and study of selenium-containing nanoscale systems stabilized with hydroxyethyl cellulose B30K were carried out. At the first stage, the methodology for the synthesis of selenium–containing nanosystems was optimized, where selenic acid was used as a precursor, ascorbic acid as a reducing agent, and hydroxyethyl cellulose B30K as a stabilizer. As a result, it was found that optimal concentrations and weight of the components are: C (H₂SeO₃) = 0.3536 mol/l; m (hydroxyethyl cellulose) = 0.015 g; C (C₆H₈O₆) = 0.7938 mol/l. Computer modeling was performed, in which it was established that interaction of selenium with hydroxyethyl cellulose B30K is energetically advantageous (∆E ≥ 2399.586 kcal/mol) and chemically stable (0.076 ≤ n ≤ 0.093 eV), and the most likely interaction option was determined. At the next stage, the technological parameters of the reaction medium were optimized, as a result of the data obtained, it was found that the optimal parameters are: pH = 11, t = 25 °C, τ = 15 min. Further, influence of pH of the medium on selenium-containing nanoscale systems stability was studied, as a result it was found that samples are most stable at pH = 6.8.

An important stage in the process of formation of micro- and nanosystems is control operations. For operational monitoring of colloidal nano- and microstructured films, atomic force microscopy is used, implemented by the method of amplitude modulation semi-contact scanning. This method is characterized by the complexity and duration of setting the sample scanning parameters. In this project, a neural network has been developed to automatically optimize process parameters during scanning, which can significantly speed up the process and improve image quality and measurement accuracy.

Scanning capillary microscopy is an optimal tool for contactless visualization of living cells and measurement of their mechanical properties. Capillary microscopy is increasingly used to study intercellular contacts, to assess morphology under different growth conditions of cell culture, to visualize and measure the topography of tissue sections. Contactless visualization without the use of labels and fixation, the possibility of research in liquid media with high spatial resolution, and long-term experiments with living objects make capillary microscopy an important and relevant tool in modern research. Therefore, the improvement of device of a capillary microscope, its internal architecture, mechanics, electronics, and software are of particular interest.

In the presented paper the complex studies of microstructure and phase composition of the alloy before and after electrochemical corrosion tests in solutions of 1M HCl, 3M HCl, 1M H₂SO₄, 3M H₂SO₄ have been carried out. The studies showed that the corrosion process in the alloy Ti_49.1Ni_50.9 in the case of electrochemical corrosion took place on all samples and in all solutions in the form of appearance of pittings, as well as with corrosion products when tested in H₂S_O4 solutions with different concentrations, in the case of 3 M HCl corrosion products were also found on the surface of the samples. A change in microstructure character was found in the coarse grained state in 3 M solutions, while no such change was found in the ultrafine grained state.