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A composite material consisting of Fe3O4 nanoparticles embedded in a 200 nm-diameter porous Si (pSi) nanoparticle “superstructure” is prepared as a potential magnetic resonance imaging contrast agent. Dipolar magnetic coupling between Fe3O4 nanoparticles is enhanced due to their proximity in the pSi host matrix, resulting in an increase in the saturation magnetization and coercivity of the composite.
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Kinsella et al. (2011) studied this question.
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