caa a22 4500 605490066 CHVBK 20210128100503.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1134/S1061933X15020155 doi (NATIONALLICENCE)springer-10.1134/S1061933X15020155 A magnetic fluid for operation in strong gradient fields [Elektronische Daten] [A. Pshenichnikov, A. Lebedev, A. Radionov, D. Efremov] The properties of a magnetic fluid based on colloidal magnetite and VM-3 vacuum oil have been experimentally studied. The fluid is designed for a long-term operation in strong gradient magnetic fields. A variant of magneto-granulometric analysis has been proposed that makes it possible to determine the average magnetic moment, variance of magnetic moments, and number density of particles with no a priori assumptions of the particle size distribution. Magneto-granulometric and cluster analyses of the magnetic fluid have been carried out. It has been shown that individual particles with an average diameter of the magnetic core of 7 nm, which is markedly smaller than those in common commercial fluids, prevail in the studied solution. The volume concentration of multiparticle clusters is also low; their total contribution to the initial magnetic susceptibility of the fluid only slightly exceeds 3%. The small particle sizes and the low cluster concentration provide the colloidal solution with a high stability in a strong magnetic field and a centrifugal force field at a rather high saturation magnetization of the solution. Pleiades Publishing, Ltd., 2015 Pshenichnikov A. Institute of Mechanics of Continua, Ural Branch, Russian Academy of Sciences, ul. Akademika Koroleva 1, 614013, Perm, Russia aut Lebedev A. Institute of Mechanics of Continua, Ural Branch, Russian Academy of Sciences, ul. Akademika Koroleva 1, 614013, Perm, Russia aut Radionov A. OOO NPVP Ferrogidrodinamika, ul. Bol'shaya Morskaya 45/5, 54030, Nikolaev, Ukraine aut Efremov D. Perm National Research University, ul. Bukireva 15, 614090, Perm, Russia aut Colloid Journal Pleiades Publishing 77/2(2015-03-01), 196-201 1061-933X 77:2<196 2015 77 10595 https://doi.org/10.1134/S1061933X15020155 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061933X15020155 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pshenichnikov A. Institute of Mechanics of Continua, Ural Branch, Russian Academy of Sciences, ul. Akademika Koroleva 1, 614013, Perm, Russia aut NATIONALLICENCE 700 1- Lebedev A. Institute of Mechanics of Continua, Ural Branch, Russian Academy of Sciences, ul. Akademika Koroleva 1, 614013, Perm, Russia aut NATIONALLICENCE 700 1- Radionov A. OOO NPVP Ferrogidrodinamika, ul. Bol'shaya Morskaya 45/5, 54030, Nikolaev, Ukraine aut NATIONALLICENCE 700 1- Efremov D. Perm National Research University, ul. Bukireva 15, 614090, Perm, Russia aut NATIONALLICENCE 773 0- Colloid Journal Pleiades Publishing 77/2(2015-03-01), 196-201 1061-933X 77:2<196 2015 77 10595