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Stable magnetite nanoparticle aqueous dispersions were prepared by precipitating ferrous ions in the presence of an ionic liquid containing acrylic acid anion, viz., N-methylimidazolium acrylic acid (MImAA) in air at high pH. The size of the as-prepared magnetite nanoparticles could be tuned from 12nm to 20nm depending on the concentration of MImAA in the medium. X-ray diffractions showed the presence...
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