Search academic texts

Information × Registration Number 0218U001372, 0117U004963 , R & D reports Title Development of the hardware -software complex for broadband impedance measurement of solutions, suspensions, biological tissues and liquids popup.stage_title Head Mustestov Timofy, Registration Date 13-03-2018 Organization Kharkov National University named after V.N. Karazin popup.description2 The problem of studying the electrophysical properties of materials and biological tissues is an important application problem in medicine, chemistry, nanoparticle physics, semiconductor physics, solid state physics, low temperature physics and other fields which require research of properties and structure of a substance. Methods of dielectric and magnetic spectroscopy are of particular importance for the identification and study of the substances structure. The impedance spectroscopy method is promising in terms of its implementation and application in new methods of medical diagnostics, chemical analysis of substances, the discovery of new physical properties of composites and nanomaterials, for the study of electrodynamic parameters of nonlinear dispersion media. The subject of development is the complex dielectric and magnetic permeability of liquids, biological materials, suspensions of nanoparticles dependence on the electric current frequency. The object of development is the processes of polarization, magnetization, dissipation in liquid media of different physical nature, which determine the dispersion of the impedance of matter. The purpose of the project is to develop a hardware and software complex for the investigation of magneto-dielectric spectra of substances of different physical nature. Particular attention will be paid to the study of the properties of biological tissues and liquids, suspensions of nanoparticles, absorption properties of solutions of hydroxyl and hydroperoxyl radicals. The main objectives of the project are to solve the theoretical and applied problems: - theoretical rationale of the broadband impedance measurement method; - development of the hardware part of the device for measuring the complex dielectric and magnetic permeability of the substances; - software development for computing and visualization of data; - development of the device calibration methods; - carrying out the research and measurements of dielectric spectra of biological liquids, suspensions of nanoparticles, aqueous solutions, etc. The project is aimed at developing an experimental model of the hardware and software complex - broadband (0.1 Hz - 6.8 GHz) dielectric and magnetic spectroscopy system for the materials of various nature, including biological tissues and liquids. According to the technical specification, the first experimental sample of the device for impedance spectroscopy of liquid materials was produced. Primary experiments were carried out on the application of the impedance spectroscopy method to evaluate the stability of suspensions and the degree of agglomeration of nanoparticles. It is shown that the formation of agglomerates of nanoparticles reduces the suspension electrical conductivity. The impedance spectroscopy method has been used to optimize the process of manufacturing nanoparticles and to control their parameters. The method of measuring the concentration of nanoparticles in a real time scale has been developed. The method of synthesis of iron nanoparticles in a magnetite shell based on the reaction of controlled oxidation of iron nanoparticles with ozone has been developed. The method for stabilizing aqueous suspensions of iron nanoparticles was developed for the first time based on reactions of hydroxyl and hydroperoxyl radicals formation. Product Description popup.authors Антоненко Є. Кожешкурт В. Медвєдєв М. Приходько К. Штода Д. popup.nrat_date 2020-04-02 Close