Abstract
The behavior of BCMF in an external magnetic field was studied by acoustic spectroscopy. The linear increase, decrease and jump change of the external magnetic field up to 200 mT was applied and corresponding changes of acoustic attenuation were studied. The change of acoustic attenuation was connected with the structural changes of magnetic nanoparticles in the water-based magnetic fluid when an external magnetic field is applied. Measurements were made also for several temperatures of the range of 15-30°C to know the influence of thermal motion to nanoparticle aggregations. The significant influence of both magnetic field and temperature on the change of acoustic attenuation was observed. The obtained results are very important for magnetic drug targeting (MDT) for example, for the using of optimal concentration of magnetic nanoparticles (MNPs) as it is impossible to use very concentrated BCMF due to the strong aggregation of MNPs.
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