Preparation of magnetite aqueous dispersion for magnetic fluid hyperthermia (original) (raw)
2011, Journal of Magnetism and Magnetic Materials
Aqueous magnetic suspension was prepared by dispersing amphiphilic co-polymers coated monodispersed magnetite nanoparticles synthesized through thermal decomposition of iron(III) acetylacetonate (Fe(acac) 3 ) in the mixture of oleic acid and oleylamine. The average diameter of narrow size-distributed magnetite nanoparticles varied between 5 and 12 nm depending on the experimental parameters such as the ratio between Fe(acac) 3 and the oleic acid-oleylamine mixture and reaction temperature. Though the as-synthesized particles were coated with oleic acid and dispersible in organic solvent, their surfaces were modified using amphiphilic co-polymers composed of poly(maleic anhydride−alt−1−octadecene) and polyethylene glycol methyl ether and made dispersible in water. Infrared spectra of the sample indicated the existence of −COOH groups on the surface for further conjugation to biomolecules.
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