We report the formation of magnetic onion-type multilamellar vesicles. Iron oxide nanoparticles (np's) were synthesized inside lipidic multilamellar vesicles by coprecipitation of vesicle-encapsulated Fe(2+) and Fe(3+) ions induced by HO(-) diffusion through vesicle lamellae. The iron ion encapsulation efficiency of onions was measured by potentiometry and UV-vis absorbance spectroscopy. Its high value (75 +/- 5% for both Fe(2+) and Fe(3+)) ensures an intravesicular synthesis, as confirmed by cryo-transmission electron microscopy (TEM) imaging. The as-grown nanoparticles are characterized by X-ray diffraction analysis and TEM, and magnetic onions are imaged by cryo-TEM. The np size, controlled by temperature and time, ranges from 3 to 6 nm and is shown to be a key parameter for onion stability.
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