CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
artículos
Título:
CHANGES ON STRUCTURAL AND MAGNETIC PROPERTIES OF MAGHEMITE NANOPARTICLES DURING THEIR COVERAGE WITH MCM-41
Autor/es:
N. A . FELLENZ; I.O. PÉREZ DE BERTI; ANALIA L. SOLDATI; SILVANA STEWART; S.G. MARCHETTI; J. F. BENGOA
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 41 p. 15057 - 15057
ISSN:
0272-8842
Resumen:
AbstractThis workreportsasimplesynthesisofamesoporousorderedsilicastructure(MCM-41)grownuparoundpre-synthesizedmaghemitenanoparticles. Acompositewithmagneticresponseandhighspecific surfaceareawasobtainedaddingmaghemitenanoparticlescoatedwitholeicacid inthesynthesisgelofMCM-41and finally calcininginair.Differentcharacterizationstechniquessuchasmagneticmeasurements,Mössbauer spectroscopyat25and 260 1C andtransmissionelectronmicroscopywereusedtostudythemagneticandstructuralchangesoftheinitial maghemitenanoparticlesproducedduringitscoveragewiththemesoporoussilicastructure.Thepresenceofthemesoporousstructureinhibits theexpectedtransformationfrommaghemitetohematitewhenthesystemwascalcinedinairat510 1C. Itwasestablishedthatasinteringof thenanoparticlesduringthecalcinationstepoccurs,leadingtoamagnetizationsaturationvaluesimilartothatofthebulkcompound.Inorderto evaluatethecapabilityasadsorbent,themagneticcompositewassubjectedtoasurfaceamino-functionalizationandthentestedforCr(VI)andCu(II) adsorptionfromwater
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