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R. BOSINCEANU*, N. SULITANU. Synthesis and characterization of FeO(OH)/Fe3O4 nanoparticles encapsulated in zeolite matrix. The 8th International Conference on Physics of Advanced Materials, June 4-7, 2008, Iasi, Romania, Vol. 10, No. 12, p. 3482 348, 2008.

Abstract: Nanoparticles and nanoclusters of FeO(OH)/Fe3O4 have been incorporated by co-precipitation in the clinoptilolite channels. In the present study, we demonstrate the coexistence of paramagnetic and superparamagnetic Fe(III) in clinoptilolite. The bound of trivalent iron in clinoptilolite results in the formation iron oxide nanoclusters in microvoids, and stabilize AlO4 tetrahedral in the aluminosilicate matrix. The resulting non-framework and bound Fe(III) exhibit superparamagnetic and paramagnetic properties, respectively. The dual behavior of Fe(III) in CLI is deduced using various analytical and spectroscopic techniques, e.g. X-ray diffraction (XRD), diffuse reflectance ultraviolet-visible (DRUV-VIS) and magnetization measurements at room temperature with vibrating magnetometer.

Keywords: Clinotilolite, Microporous molecular sieves Iron oxide nanoclusters, Paramagnetism, Superparamagnetism


Posted by Radu Bosinceanu


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