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Загальна кількість знайдених документів : 7
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1.

Storozhenko A. M. 
Features of the Rotational Kinetic of Magnetic Fluid Nanoparticles [Електронний ресурс] / A. M. Storozhenko, P. A. Ryapolov, A. O. Tantsyura, V. M. Polunin, I. M. Aref'ev, T. A. Aref'eva, Yu. B. Kazakov, Yu. A. Neruchev, V. I. Korotkovskii // Журнал нано- та електронної фізики. - 2014. - Т. 6, № 3. - С. 03056-1-03056-4. - Режим доступу: http://nbuv.gov.ua/UJRN/jnef_2014_6_3_58
The results of theoretical and experimental studies of the effect of the perturbation of magnetization of magnetic fluid in the initial part of magnetization curve, caused by thermal oscillations in the adiabatic sound wave are considered. The measurements were carried out on the magnetic colloid samples with different viscosity of the dispersion medium within the frequency band of 20 - 60 kHz. In this frequency band, studied samples are characterized by the absence of thermal relaxation of the magnetization. The comparison of the conclusions of the model of thermal relaxation of magnetization and the experimental results makes it possible to obtain information about the features of the rheology for the nearest molecular environment of a particle - nanorheology.
Попередній перегляд:   Завантажити - 391.506 Kb    Зміст випуску    Реферативна БД     Цитування
2.

Polunin V. M. 
Restriction of Helmholtz Model [Електронний ресурс] / V. M. Polunin, S. G. Emelyanov, I. A. Schabanova, P. A. Ryapolov, Min Tan Myo, G. V. Karpova, T. I. Aksenova // Журнал нано- та електронної фізики. - 2014. - Т. 6, № 3. - С. 03072-1-03072-4. - Режим доступу: http://nbuv.gov.ua/UJRN/jnef_2014_6_3_74
The results of the experimental studies of physical mechanisms of energy dissipation in the oscillating system in which air cavity held by the forces of magnetic levitation is used as the elastic element, and magnetic fluid prepared on the basis of dispersing media with different viscosity level is used as the inertial element are considered in the article. Based on the obtained results the conclusion on the restriction of the applicability of Helmholtz equation, caused by boundary effects is made.
Попередній перегляд:   Завантажити - 222.78 Kb    Зміст випуску    Реферативна БД     Цитування
3.

Polunin V. M. 
Physics of Hermetic Sealing of Large Portion of Gas Using Magnetic Fluid Membrane [Електронний ресурс] / V. M. Polunin, L. M. Chervyakov, I. A. Schabanova, P. A. Ryapolov, Min Tang Myo, O. V. Lobova, V. М. Paukov // Журнал нано- та електронної фізики. - 2014. - Т. 6, № 3. - С. 03074-1-03074-3. - Режим доступу: http://nbuv.gov.ua/UJRN/jnef_2014_6_3_76
The physical mechanism of hermetic sealing and storing the air cavity of large volume, based on using magnetic fluid membrane is considered in the article. The described method can be used to create devices for sampling and further chemical analysis of gas in mines and at chemical industry enterprises.
Попередній перегляд:   Завантажити - 336.619 Kb    Зміст випуску    Реферативна БД     Цитування
4.

Bashtovoi V. G. 
Influence of Mass Transfer Processes on Couette Flow of Magnetic Fluid [Електронний ресурс] / V. G. Bashtovoi, S. G. Pogirnitskaya, R. Kuzhir, V. M. Polunin, P. A. Ryapolov, I. A. Shabanova, A. M. Storozhenko // Journal of Nano- and Electronic Physics. - 2013. - Vol. 5, № 4(1). - С. 04011-1-04011-3. - Режим доступу: http://nbuv.gov.ua/UJRN/jnep_2013_5_4(1)__13
This article describes the results of a theoretical study of magnetic fluid two-dimensional Couett flow in magnetic fluid seal model in view of mass transfer processes. It has been shown that very inhomogeneous magnetic field in seal gap lead to magnetic particle concentration rearrangement due to magnetophoresis and Brownian diffusion. In turn, it lead to inhomogeneous magnetic fluid viscosity and change in local and integral shearing force at channel walls. Integral shearing force has been shown to depend on magnetic field and magnetic fluid parameters. Closely-packed fluid density distribution conditions have been defined. Proposed theory covers real magnetic fluid seal performance features adequately.
Попередній перегляд:   Завантажити - 215.809 Kb    Зміст випуску    Реферативна БД     Цитування
5.

Boev M. L. 
Fluctuations of the Solitary Bubble at the Separation from the Air Cavity, Compressed by the Magnetic Field in Magnetic Liquid [Електронний ресурс] / M. L. Boev, V. M. Polunin, O. V. Lobova, I. A. Shabanova, L. M. Chervjakov, A. N. Ryapolov // Journal of Nano- and Electronic Physics. - 2013. - Vol. 5, № 4(1). - С. 04014-1-04014-5. - Режим доступу: http://nbuv.gov.ua/UJRN/jnep_2013_5_4(1)__16
In the article, on the basis of the concept of "display" of geometry of a free surface of the "low-magnetic" environment by the topography of isolines of the module of intensity of a magnetic field, it is studied a form of a free surface of magnetic fluid in a static condition at the initial stage of rapprochement of a ring magnet with a surface of a column of magnetic fluid in a tube and at a stage of pressing of a cavity to a bottom. It is shown that the separation of bubbles from an air cavity occurs in close proximity to the plane of symmetry of a ring magnet on its axis. It is described the method and experimental installation for studying the possibility of electromagnetic indication of sizes of the air bubbles, being in magnetic fluid. It is discussed the results of experimental research on process of a separation of solitary air bubble from a cavity, contained in magnetic fluid and squeezed by ponderomotive forces of a magnetic field which are of interest for creation of essentially new technique of the dosed supply of small amount of gas in the reactor.
Попередній перегляд:   Завантажити - 267.46 Kb    Зміст випуску    Реферативна БД     Цитування
6.

Emelyanov S. G. 
From the Dynamic Demagnitizing Factor to the Heat Capacity of a Nanodispersed Magnetic Fluid [Електронний ресурс] / S. G. Emelyanov, V. M. Polunin, A. O. Tantsyura, A. M. Storozhenko, P. A. Ryapolov // Journal of Nano- and Electronic Physics. - 2013. - Vol. 5, № 4(1). - С. 04027-1-04027-3. - Режим доступу: http://nbuv.gov.ua/UJRN/jnep_2013_5_4(1)__29
A technique for the measurement of the dynamic demagnetizing factor, used for the description of magnetic fluid magnetization disturbance caused by a sonic wave has been offered. The formula for the calculation of heat capacity Cp of the synthesized magnetic colloids, which includes the parameter Nd has been obtained.
Попередній перегляд:   Завантажити - 268.103 Kb    Зміст випуску    Реферативна БД     Цитування
7.

Ryapolov P. A. 
The Analysis of the Structural Parameters of Magnetic Fluids with SAXS and MGA Techniques [Електронний ресурс] / P. A. Ryapolov, V. M. Polunin, A. P. Kuzmenko, S. G. Emelianov, E. Y. Orlov, A. S. Chekadanov // Журнал нано- та електронної фізики. - 2015. - Т. 7, № 4. - С. 04003-1-04003-3. - Режим доступу: http://nbuv.gov.ua/UJRN/jnef_2015_7_4_5
Purpose - to study the structural parameters of the magnetite particles surrounded by the surfactant in the various carrier liquids using SAXS and based on the magnetization curve obtained applying ballistic method. The samples of the magnetite magnetic fluid based on water, engine oil and kerosene were investigated in this paper. Methodology - three samples of magnetic fluid were chosen for studying. Samples No 1 and No 2 were obtained at the UNESCO department of "Energy Conservation and Renewable Energy Sources", Belarusian National Technical University. Sample No 3 was obtained in the Fundamental Scientific Research Laboratory of Applied Ferrohydrodynamics of Ivanovo State Power Engineering University. SAXS experiment was conducted using Anton Paar SAXSess mc<^>2 analyzer at the Regional Centre of Nanotechnology of Southwest State University. Originality/value - The value of this work is to obtain new data on the physical parameters of the magnetic fluid samples. Findings - the derived surfactant shell width, which for the samples No 2, 3 was 1,8 - 1,9 nm, for the sample No 1 surfactant shell width was 3,5 nm, the excess of the calculated width of the surfactant layer can be explained due to the presence of a double layer of stabilizer. Keywords: Magnetic fluid, Magnetite nanoparticles.
Попередній перегляд:   Завантажити - 250.013 Kb    Зміст випуску    Реферативна БД     Цитування
 
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