MAGNETIC AND X-RAY-DIFFRACTION STUDIES ON DEXTRAN IRON-OXIDE MAGNETICFLUID

Two types of dextran iron-oxide complexes (ATDM and CMDM), magnetic fl uid applicable to the contrast agent of magnetic resonance imaging of living body, have been synthesized without surfactant. We have measure d temperature dependances of magnetization and X-ray diffraction of AT DM, CMDM and also magnetite fine-particles as a reference substance in atmospheres of air and helium up to 840 degrees C. The results are di scussed in view of the reaction of magnetite core with the surrounding gas and products formed by thermal decomposition of the dextran molec ules which is directly bonded to magnetite core of the complexes.