(a) Macroscopic colloidal crystals of silica-encapsulated FePt nanoparticles. (b) Low magnification TEM micrograph showing hcp packing of the nanoparticles. (c) High magnification TEM micrograph showing the core-shell structure of the nanoparticles.
SAXS data (circles) modeled (line) with a best fit of a hcp crystal composed of monodisperse ellipsoids of , , and .
Plot of magnetic moment per unit mass as a function of the applied field for two samples of silica-encapsulated FePt nanoparticles in the form of colloidal crystals and unaligned particle assemblies.
Plot of the absorbance of (a) cytochrome B5 and (b) BSA protein as a function of time in the presence of the colloidal crystals with (diamonds) and without (squares) dc applied field. The solid lines were added as a guide for the eyes.
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