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Magnetization behaviour of Fe₃O₄–water and γ-Fe₂O₃–water magnetic nanofluids
Rahime Alsangur, Serkan Doğana, Alpaslan Turgut and Levent Çetin

Abstract: Magnetic nanofluids are colloids that contain magnetic nanoparticlesn dispersed in a base fluid. In the presence of the external magnetic field, they can be magnetized and manipulated. Moreover, their thermophysical properties may be tuned. Therefore, it is important to investigate the magnetization behaviour of them. For this purpose, magnetization behaviours of magnetite (Fe₃O₄)-water and maghemite (γ-Fe₂O₃)- water which are commonly used in the available literature were investigated by a vibrating sample magnetometer (VSM). Various samples with different volume concentrations for Fe₃O₄ -water (1 and 2%) and γ-Fe₂O₃ -water (1.1 and 2.2%) nanofluids were used in the measurements. The results indicated that γ-Fe₂O₃ -water magnetic nanofluid have higher saturation magnetization values than Fe₃O₄ -water magnetic nanofluid. The measurements also pointed out that as the volume concentration increases, the magnetization of both magnetic nanofluids increases as well.

Keywords: Magnetic nanofluids, Magnetic properties, Magnetization, Magnetite, Maghemite, Particle size.