Reena Mary, A P; Narayanan, T N; Vijutha, Sunny; Sakthi Kumar, D; Yasuhiko, Yoshida; Joy, P A; Anantharaman, M R(Springer, 2010)
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Abstract:
Bio-compatible magnetic fluids having high
saturation magnetization find immense applications in
various biomedical fields. Aqueous ferrofluids of superparamagnetic
iron oxide nanoparticles with narrow size
distribution, high shelf life and good stability is realized by
controlled chemical co-precipitation process. The crystal
structure is verified by X-ray diffraction technique. Particle
sizes are evaluated by employing Transmission electron
microscopy. Room temperature and low-temperature magnetic
measurements were carried out with Superconducting
Quantum Interference Device. The fluid exhibits good
magnetic response even at very high dilution (6.28 mg/cc).
This is an advantage for biomedical applications, since only
a small amount of iron is to be metabolised by body organs.
Magnetic field induced transmission measurements carried
out at photon energy of diode laser (670 nm) exhibited
excellent linear dichroism. Based on the structural and
magnetic measurements, the power loss for the magnetic nanoparticles under study is evaluated over a range of
radiofrequencies.