Effect of presence of an acid catalyst on structure and properties of iron-doped siloxane-polyoxyethylene nanocomposites prepared by sol-gel

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorChiavacci, L. A.
dc.creatorDahmouche, K.
dc.creatorSilva, NJO
dc.creatorCarlos, L. D.
dc.creatorAmaral, V. S.
dc.creatorBermudez, V. D.
dc.creatorPulcinelli, Sandra Helena
dc.creatorSantilli, Celso Valentim
dc.creatorBriois, V
dc.creatorCraievich, A. F.
dc.date2014-05-20T15:29:06Z
dc.date2016-10-25T18:04:18Z
dc.date2014-05-20T15:29:06Z
dc.date2016-10-25T18:04:18Z
dc.date2004-10-15
dc.date.accessioned2017-04-06T00:10:25Z
dc.date.available2017-04-06T00:10:25Z
dc.identifierJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 345, p. 585-590, 2004.
dc.identifier0022-3093
dc.identifierhttp://hdl.handle.net/11449/38759
dc.identifierhttp://acervodigital.unesp.br/handle/11449/38759
dc.identifier10.1016/j.jnoncrysol.2004.08.089
dc.identifierWOS:000225583200111
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2004.08.089
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/881810
dc.descriptionIn this work we investigate the effect of hydrochloric acid (HC) addition on the structure and thermal and magnetic properties of iron-doped siloxane-polyoxyethylene (POE) hybrids prepared by the sol-gel route. X-ray powder diffraction (XRD) and X-ray absorption near edge structure (XANES) results reveal the dominance of ferrihydrite nanoparticles and a mixture of this phase with FeCl4- species in the hybrid prepared without and with HCl, respectively. Thermal analysis reveals the existence of two crystalline polymeric phases in the hybrid prepared with HCl whereas hybrids prepared without HCl are amorphous. The 105 and 60 Angstrom sized ferrihydrite nanoparticles were detected by SAXS analysis of the composite prepared without and with HCl, respectively. The magnetic results suggest that in both samples antiferromagnetic nanoparticles coexist with small clusters/isolated ions. In the sample without HCl addition, larger particles dominate the magnetic behavior, while the opposite occurs for the sample prepared using HCl catalyst. (C) 2004 Elsevier B.V. All rights reserved.
dc.languageeng
dc.publisherElsevier B.V.
dc.relationJournal of Non-Crystalline Solids
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleEffect of presence of an acid catalyst on structure and properties of iron-doped siloxane-polyoxyethylene nanocomposites prepared by sol-gel
dc.typeOtro


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