Abstract
Abstract A convenient and efficient method of reversible phase transfer of ferromagnetic L10-FePt nanoparticles between aqueous and organic phases was developed. From the SiO2-coated L10-FePt nanoparticles prepared by the “SiO2-nanoreactor” method, stable aqueous dispersions of L10-FePt nanoparticles were prepared first by using tetramethylammonium hydroxide (TMAOH). Replacement of TMAOH by mixtures of oleic acid and oleylamine enables transfer of the L10-FePt nanoparticles from aqueous to organic phase. The L10-FePt nanoparticles could be subsequently transferred to aqueous phase by replacing the hydrophobic ligands with TMAOH. Magnetic properties were unchanged during the phase transfer, suggesting that these L10-FePt nanoparticles will be of great importance not only for applications in biomedical fields but also for fabrication of high-performance magnetic devices via bottom-up processes.
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