Registration Number
0210U005106,
0107U007699
, R & D reports
Title
Physical-chemical hydrodynamics of nanosized suspensions, thin layers and cellular structures in electrolytic solutions
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Head
Shilov Vladivir Nikolaevich,
Registration Date
07-06-2010
Organization
F.D. Ovcharenko Institute of biocolloidal Chemistry NAS of Ukraine
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The general approach to the problem of mathematical modeling of concentrated suspension's response to the action of the applied fields (pressure, electric and chemical potential gradients) The approach generalizes the cell models, which are used for the theory of transport coefficients for concentrated disperse systems. The method was used for calculation of transport coefficients in Debye approximation. The distribution of electric potential in the diffuse electric double layer of suspensions of nano-particles was calculated. A new parameter of heterogeneity - the ratio of distance between the particles to Debay length - was introduced for the case of strongly overlapped double layers of suspended nano-particles. The distribution of electric potential, linear with respect to this parameter was get, and an estimation of the possibility of homogeneous approximation was made for one example of electrokinetic phenomena, namely, for the electroacoustic effect. The quantitative analysis of effects on ion transport kinetics on ionic composition of Langmuir-Blodgett (LB) films, formed by charged monolayers of amphiphilic molecules. Dynamic regimes of LB films formation under the competitive adsorption of several varieties of counter-ions, each with different diffusion coefficients, charge, binding constants and the concentration was modeled numerically. Established that the composition of films caused to vary the speed of transfer monolayer. At low speeds the transfer of ion binding constant higher the extent provided in transferred monolayers than at high speeds. On the contrary, the presence of ions with lower binding constant increases with increasing speed the process. Dependence of ion composition and, accordingly, the film's structure on the speed of the process provides additional tools to control and modify the properties of films. The results can be applied in experimental studies aimed at obtaining nano-structured coatings with desirable properties. Classical Pauly-Schwan electrical model of the biological cell in electrolyte solution generalized by taking into account of ionic selectivity of the passive transport of the ions through the cell membrane and along the cell surface in cellular wall and (or) in outer part of the electric double layer. Analytical theory of dielectric dispersion of suspensions of biological cells in a wide frequency band, covering all three, characteristic of these systems dispersion region was developed, while the classic model only describs is very large amplitude value which are typical for dispersion and that they are completely associated with ion selective conductivity cell's surface nano structures leads to a unique sensitivity of low frequency dielectric spectrum to effective conductivity of living cell membranes, which may find important applications in biology and medicine. The method of obtaining information about the structure of deposits of nanoscale silver particles formed in yeast cells because of their life in a solution containing the metal. This enabled us to determine the surface conductivity at constant current and frequency of the dispersion. Multiple excess surface conductivity of the cell wall of alternating current over the surface conductivity on DC demonstrates the formation within the cell wall of a net structure of silver particles.
Product Description
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Бондаренко М. П.
Борковська Ю.Б.
Жолковський Е.К.
Ковальчук В. І.
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2020-04-02
