Structural and Magnetic Properties of Co Modified MCM-41 by Wet Impregnation

CUELLO, N.I.; EIMER, G.A.; OLIVA, M.I.

Buenos Aires

Workshop; X Latin American Workshop on Magnetism, Magnetic Materials and their Applications; 2013

Mesoporous Si-MCM41 were sintetized and Co modified by wet impregnation method, using a cobalt nitrate solution (Co(NO3)2,6H2O) in water with different concentration to obtain a set of Co preselected loads into final solid (2,5, 5, 10y15%p/p). We study the relation between Co composition and structure, size and magnetic properties of samples. The different mesostructures were characterized by X ? rays diffraction (XRD), the Co load was observed by ICP , the superficial area measures were made in a Pulse Chemisorb equipment and magnetic characterization was performed in a SQUID magnetometer using a maximum magnetic applied field µ0Ha = 1T . As expected, as increasing Co concentration the structural order decreases and appears bigger particles. Also magnetic behavior is typically paramagnetic at high concentration and superparamagnetic at low concentration, suggesting a good Co dispersion into particle pores