Abstract
Nanosized iron-based powders of different compositions and particle sizes have been developed for medical application. It is shown that their structural and phase compositions, which are related to their magnetic properties, can be controlled. The interaction of the powders with model media such as human blood plasma and its mixture with 0.9% NaCl solution (1 : 1), distilled water, and 0.9% NaCl solution is studied. The rate of powder dissolution in blood plasma is established to depend on the α-iron content and particle size: the higher these parameters, the more intensive the powder biotransformation. The Fe 3 O 4 powders are quite resistant to model biomedia: their solubility in media containing blood plasma is one-hundredth to seven-thousandths of α-Fe solubility.
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