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[(a) and (b)] Bright-field TEM image of Dextran-coated Fe oxide particle and the corresponding indexed diffraction patterns; [(c) and (d)] CTAB-coated oxide particles and the corresponding indexed diffraction patterns. Note that the indexed but unlabeled phase is .
Hysteresis loops for both CTAB-coated and Dextran-coated Fe oxide powders at room temperature under a field of . The inset is a graph showing loops for the same particles but under a field of , the same amplitude used for the heating test.
Temperature vs time for CTAB-coated particles dispersed in methanol with a concentration of under an alternating magnetic field of and . Data for Dextran-coated Fe oxide particles with the same concentration, but dispersed in water, are given for comparison. The drop of temperature was due to magnetic field being turned off.
decay constant vs particle concentration for both the iron oxide and particles, respectively.
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