On studying the shape of dispersed nanoparticles with a rotational viscosity model. (English. Russian original) Zbl 1378.76139
Russ. Phys. J. 52, No. 8, 777-784 (2009); translation from Izv. Vyssh. Uchebn. Zaved., Fiz. 2009, No. 8, 10-15 (2009).
Summary: This paper considers the results of measuring the damping factor for an oscillatory system in which a magnetic liquid which fills a U-shaped glass tube serves as an inertial-viscous component. The role of elasticity is played by the air cavity formed inside one of the tube elbows under a piezoelectric plate, attached to the tube end face and intended for indication of oscillations. A technique for measuring the oscillation damping factor and estimating, on this basis, the shear viscosity of test magnetic liquid samples in relation to the magnetic field strength has been developed. The results of measuring the viscosity as a function of magnetic field are discussed for two samples one of which was subject to preliminary centrifugation. The use of the rotational viscosity model allows one to explain the results obtained and to gain information on the geometry of the dispersed nanoparticles.
MSC:
| 76W05 | Magnetohydrodynamics and electrohydrodynamics |
Keywords:
inertial-viscous component; damping factor of an oscillatory system; magnetic liquid; shear viscosity; ponderomotive force; magnetic colloid; rotational viscosity; aggregation of ferroparticles in a colloid system; magnetogranulometric analysis; chain aggregate; magnetorheological effect; orientation relaxation; centrifugationReferences:
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