Magnetic Properties of Biocompatible Magnetic Fluid after Electron Irradiation

Abstract

The magnetic particles in the water-based magnetic uids were sterically stabilized by natrium oleate to prevent their agglomeration and consequently the adsorption of poly-ethylene-glycol (PEG) was carried out to improve the biocompatibility of the magnetic particles. Two sets of samples were prepared. The rst set of the samples was with dierent molar weight of PEG (Mw = 400, 1000, 10 000 and 20 000) at the constant weight ratio of PEG/Fe3O4 = 0.25 and the second one was with dierent weight ratio of PEG/Fe3O4 and constant molar weight of PEG (Mw = 1000). The samples were irradiated with 20 Gy. The same reduction of saturated magnetization (about 10%) after electron irradiation with 20 Gy was observed for all prepared samples.

Magnetic Positive Positioning: Toward the application in space propulsion

“…Stable reductions in saturation magnetization of a 50% and a 25% are respectively measured after applying an irradiation dose of 1000 Gy, although most of the loss is already produced for 5 Gy. PEG is shown to behave as a protective surfactant against radiation, with this capability being independent of its molar weight [64]. The degradation process is attributed to the aggregation of particles produced by ionization.…”