Electro-Rheological Properties of Transformer Oil-Based Magnetic Fluids
K. Paulovičováa, J. Tóthová b, M. Rajňák a, M. Timko a, P. Kopčanský a and V. Lisýb,c
aInstitute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
bDepartment of Physics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia
cLaboratory of Radiation Biology, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
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The aim of this work was to study rheological behavior of nanofluids affected by electric field and temperature. We used transformer oil-based magnetic fluids, the suspensions of permanently magnetized colloidal particles (Fe3O4) coated by a stabilizing surfactant and immersed in transformer oil. The rheological characterization of transformer oil-based magnetic fluid was performed using the rotational rheometer MCR 502 in the shear rate from 10 to 1000 s-1.The strength of electric field was changed in the interval 0-6 kV cm-1. The flow curves and viscosity functions detected at three different temperatures 25, 50, and 75°C disclose rheological characteristics of samples, first of all the viscosity growth under increasing strength of electric field.

DOI: 10.12693/APhysPolA.131.1141
PACS numbers: 07.55.Jg, 75.50.Mm, 83.85.Jn, 83.60.Np