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Coexistence of paramagnetic and superparamagnetic Fe(III) in mesoporous MCM-41 silicates

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Title Coexistence of paramagnetic and superparamagnetic Fe(III) in mesoporous MCM-41 silicates
 
Creator SELVAM, P
DAPURKAR, SE
BADAMALI, SK
MURUGASAN, M
KUWANO, H
 
Subject iron-containing mcm-41
molecular-sieves
fe2o3 nanoparticles
template
catalysis
chemistry
mcm-41
mesoporous molecular sieves
iron oxide nanoclusters
paramagnetism
superparamagnetism
 
Description In the present study, we demonstrate the coexistence of paramagnetic and superparamagnetic Fe(III) in mesoporous MCM-41 matrix. The loading of trivalent iron in MCM-41 not only results in the formation of iron oxide nanoclusters in the mesovoids, but also substitutes (isomorphously) in the silicate matrix. The resulting non-framework and framework Fe(III) exhibit superparamagnetic and paramagnetic properties, respectively. The dual behaviour of Fe(III) in MCM-41 is deduced using various analytical and spectroscopic techniques, viz. X-ray diffraction (XRD), diffuse reflectance ultraviolet-visible (DRUV-VIS), electron paramagnetic resonance (EPR) and Mossbauer spectroscopy. (C) 2001 Elsevier Science B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-10-22T11:45:47Z
2011-12-15T09:10:54Z
2011-10-22T11:45:47Z
2011-12-15T09:10:54Z
2001
 
Type Article; Proceedings Paper
 
Identifier CATALYSIS TODAY,68,69-74
0920-5861
http://dx.doi.org/10.1016/S0920-5861(01)00292-9
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14891
http://hdl.handle.net/100/1726
 
Source Workshop on Nanostructured Materials and Catalysis,PERTH, AUSTRALIA,JUL 09-12, 2000
 
Language English