magnetic behavior; nano-clusters; nanoparticles; sol-gel (xerogels); iron; Mossbauer effect and spectroscopy
Abstract :
[en] Fe/SiO2 catalysts have been prepared by two different sol-gel methods, cogelation and dissolution. The cogelation and dissolution preparative methods lead to xerogels with fundamentally different pore width distributions. The nature of the iron species obtained has been examined in detail by UN-visible and Mossbauer spectroscopy, and magnetic, transmission electron microscopy, and X-ray diffraction studies. There is no evidence for the presence of any ordered iron(III) oxides in the samples but all three contain two types of iron species, specifically paramagnetic high-spin iron(III) ions isolated in silica and iron(III) containing nanoparticles with a broad width distribution centered on 1.5 nm, nanoparticles that contain antiferromagnetically coupled clusters of a few ligated bridged iron(III) ions. (C) 2007 Elsevier B.V. All rights reserved.
Disciplines :
Materials science & engineering Chemistry Physics
Author, co-author :
Heinrichs, Benoît ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Rebbouh, Leila; Université de Liège - ULiège > Département de physique
Geus, John W; Universiteit Utrecht
Lambert, Stéphanie ; Université de Liège - ULiège > Département de chimie appliquée > Ingéniérie électrochimique
Abbenhuis, Hendrikus C L; Eindhoven University
Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique
Long, Gary J; University of Missouri-Rolla
Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
van Santen, Rutger A; Eindhoven University
Language :
English
Title :
Iron(III) species dispersed in porous silica through sol-gel chemistry
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