Abstract
The magnetization (M), field-induced magnetic anisotropy (Ku), rotational hysteresis loss (E rot ) and melting point (T m ) of water-and paraffin-base ferrofluids were investigated in the temperature range from 77 K~300°K, as functions of the density of the colloidal particles. Both paraffin and paraffin-base fluids were melted down at temperatures between 180 and 210°K. In this range, the values of M and E rot for paraffin-base fluids increased, and the K u decreased, with increasing temperature. These properties may be explained by assuming that liquid-state and solid-state regions exist in the paraffin in this temperature range, and that the volume of the solid-state region decreased with increasing temperature. Depression of the freezing point was observed in water-base fluids.
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