Rheological properties of a γ-Fe2O3 paraffin-based ferrofluid

A stable gamma-Fe2O3 paraffin-based ferrofluid was prepared via high energy milling. The magnetic particles were characterized using X-ray diffraction, dynamic light scattering and vibrating sample magnetometer techniques. The rheological properties of the ferrofluid were studied using a standard rotating rheometer. The magnetoviscous effect and thixotropy in the ferrofluid were studied. The formation and destruction of magnetically induced structures and the interactions of nanoparticles and aggregates are discussed. (C) 2010 Elsevier B.V. All rights reserved.