ORBi: Heinrichs Benoît - Iron(III) species dispersed in porous silica through sol-gel chemistry

Reference : Iron(III) species dispersed in porous silica through sol-gel chemistry


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering Physical, chemical, mathematical & earth Sciences : Chemistry Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/2268/19595

Title :	Iron(III) species dispersed in porous silica through sol-gel chemistry
Language :	English
Author, co-author :	Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
	Rebbouh, Leila [Université de Liège - ULg > Département de physique > > >]
	Geus, John W [Universiteit Utrecht > > > >]
	Lambert, Stéphanie [Université de Liège - ULG > Chimie appliquée > Génie chimique - Chimie physique appliquée > >]
	Abbenhuis, Hendrikus C L [Eindhoven University > > > >]
	Grandjean, Fernande [Université de Liège - ULg > Département de physique > Département de physique >]
	Long, Gary J [University of Missouri-Rolla > > > >]
	Pirard, Jean-Paul [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
	van Santen, Rutger A [Eindhoven University > > > > > >]
Publication date :	2008
Journal title :	Journal of Non-Crystalline Solids
Publisher :	Elsevier Science
Volume :	354
Issue/season :	2-9
Pages :	665-672
Audience :	International
ISSN :	0022-3093
City :	Amsterdam
Country :	The Netherlands
Keywords :	[en] 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.
Permalink :	http://hdl.handle.net/2268/19595
DOI :	10.1016/j.jnoncrysol.2007.07.071

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