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- Ferrofluids of magnetic multicore nanoparticles for biomedical applications
Ferrofluids of magnetic multicore nanoparticles for biomedical applications
in: Journal of Magnetism and Magnetic Materials (2009)
For a variety of magnetically based biomedical applications, it is advantageous to use sedimentation stable suspensions of relatively large (d >20 nm) magnetic core–shell nanoparticles. Water-based suspensions of multicore nanoparticles were prepared by coating of the particles (synthesized by means of a modified alkaline precipitation method) with a carboxymethyldextran shell. The resulting ferrofluids were structurally and magnetically characterized. It was found that these fluids show a specific heating power of about 60W/g (f = 400kHz, H = 10kA/m). This value was increased up to 330 W/g by a simple fractionation method based on centrifugation. Finally, the cellular uptake of the multicore nanoparticles was demonstrated.