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The Oxidation of Magnetic Particles in Medicinal Ointment
Magnetic particles in a novel, wound–healing ointment were studied using Mössbauer spectroscopy and VSM to estimate the stability of the properties of the magnetic particles. The isomer shifts of Fe3O4(A) were found to be 0.49-0.56 mm/s relative to iron metal, this indicates that the iron ions inFe3O4(A) are Fe3+. On the other hand, the isomer shifts of Fe3O4(B) were found to be 0.91-1.13 mm/s relative to iron metal, this shows that the ion state of Fe3O4(B) is a mixed state of Fe2+ and Fe3+. It is noted that this composition, as well as that of the initial pure component in the form of a highly dispersed fraction (~10 Å), differs from the stoichiometric one. It was found that the area ratio of the Mössbauer subspectra of Fe3O4(A) / Fe3O4(B) taken at 87 and 181 K linearly increased in comparison to the initial pure magnetic particles, but the rate of increase of the area ratio at 181 K was about two times that at 87 K. From the magnetic hyperfine field, despite their small size, the particles exhibit no superparamagnetism.
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