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Light-induced structuralization in magnetic fluids with the negative Soret constant

J. Štelina1 - C. Musil1 - J. Bracin\'{i}k1 - P. Kopċanský2 - M. Timko2 - M. Hnatiċ2 - M. Repašan2 - I. Potoċová2 - E. Ayrjan3

1 Department of Physics, University of Żilina, Veľký Diel, 01026 Żilina, Slovakia
2 Institute of Experimental Physics SAS, 47 Watsonova, 04353 Košice, Slovakia
3 Laboratory of Information Technologies JINR, 6 Joliot-Curie, 141980 Dubna, Russia

The magnetite nanoparticle structuralization in magnetic fluids is observed as a consequence of the nano-particle thermo-diffusion. Temperature gradients can arise due to light-absorption on the accidental concentration fluctuations of particles or on well-defined geometric structures such as the concentration-diffraction grating. The obtained results have verified the negative value of the Soret constant in the studied kerosene-based magnetic fluid. The development of the structuralization of magnetic particle concentration in an illuminated thin sample, after the illumination intensity achieves some critical value I0c, was numerically simulated and verified experimentally. Figs 4, Refs 6.

Magnetohydrodynamics 41, No. 4, 347-352, 2005 [PDF, 0.19 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X