Viscosity Dependence of a Magnetic Fluid Nanoparticles Concentration

J. Tóthováa, J. Kováčb, P. Kopčanskýb, M. Rajňákb, K. Paulovičováb, M. Timkob and A. Józefczakc aDepartment of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia bInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia cInstitute of Acoustics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61 614 Poznań, Poland

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In this work we have studied the effect of temperature on the viscosity of magnetic fluids (MFs) based on the transformer oil ITO 100. The volume concentration of suspended magnetic particles (MPs) changed from 0.25 to 1%. Rheological characterization of MFs was performed using a vibroviscometer at working frequency of 30 Hz. The temperature dependence of the viscosity was measured in the temperature range from 20 up to 50 °C. The magnetization of different concentrations of MPs in MFs was determined by using the vibrating sample magnetometer.

DOI: 10.12693/APhysPolA.126.278 PACS numbers: 07.55.Jg, 75.50.Mm, 83.85.Jn