Magnetic nanocomposites containing iron oxide (maghemite) nanoparticles, well embedded in a synthetic clay matrix (laponite) were prepared by a new one step chemical route and characterized by TEM, XRD, magnetization measurements, Mössbauer spectroscopy, DLS, and MRI measurements. The synthetic procedure leads to non-stoichiometric γ-Fe(2)O(3) with a controllable content in the nanocomposite. Magnetic nanoparticles incorporated in the diamagnetic clay matrix exhibit a mean diameter of 13 nm, superparamagnetic behavior with a high saturation magnetization achievable at low applied magnetic fields. In-field Mössbauer spectra and ZFC/FC magnetization curves reveal a perfect ferrimagnetic ordering within nanoparticles with negligible spin frustration and interparticle interactions due to the complete coating of maghemite surfaces by the nanocrystalline laponite matrix. Magnetic iron oxide nanoparticles embedded in laponite matrix exhibit strong T(2) weighted MRI contrast. The maghemite/laponite composite particles have 200 nm hydrodynamic diameter and form very stable hydrosols and/or hydrogels depending on their concentration in water.

Institute of Materials Science N C S R Demokritos Agia Paraskevi 15310 Athens Greece Materials Science Department School of Natural Sciences University of Patras Rio 26504 Patras Greece Departments of Experimental Physics and Physical Chemistry Faculty of Science Palacky University in Olomouc Svobody 26 771 46 Olomouc Czech Republic Centre for Nanomaterial Research Faculty of Science Palacky University in Olomouc Svobody 26 771 46 Olomouc Czech Republic Department of Physics and Astronomy University of Delaware Newark DE 19716 USA Department of Neurological Surgery Winship Cancer Institute Emory University School of Medicine Atlanta GA 30322 USA Department of Radiology Emory University School of Medicine Atlanta GA 30322 USA

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