Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization

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Co-modified mesoporous supports with MCM- 41 structure and several metal loadings were successfully synthesized by a fast wet impregnation method. The nature and location of different Co species formed on the solids were inferred by TEM/SEM, XPS, XANES/EXAFS, adsorption of pyridine coupled to FT-IR...

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Detalles Bibliográficos
Autores principales: Elías, Verónica, Cuello, Natalia, Andrini, Leandro Rubén, Requejo, Félix Gregorio, Oliva, Marcos, Eimer, Griselda
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Física
EXAFS/XANES
Magnetic properties
XPS
Surface properties
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/103893
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-103893
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
EXAFS/XANES
Magnetic properties
XPS
Surface properties
spellingShingle Física
EXAFS/XANES
Magnetic properties
XPS
Surface properties
Elías, Verónica
Cuello, Natalia
Andrini, Leandro Rubén
Requejo, Félix Gregorio
Oliva, Marcos
Eimer, Griselda
Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization
topic_facet Física
EXAFS/XANES
Magnetic properties
XPS
Surface properties
description Co-modified mesoporous supports with MCM- 41 structure and several metal loadings were successfully synthesized by a fast wet impregnation method. The nature and location of different Co species formed on the solids were inferred by TEM/SEM, XPS, XANES/EXAFS, adsorption of pyridine coupled to FT-IR spectroscopy and temperature dependence of magnetization. The presence of Co oxide species (clusters and Co3O4 nanoparticles) inside the channels of all the samples could be evidenced by TEM, XPS and XANES/EXAFS. In this sense, the surface Co/Si atomic ratios obtained by XPS were notably lower than the corresponding bulk Co/Si ratios obtained by ICP, indicating that the Co atoms are mostly incorporated inside the mesopores channels of the silica matrix. Nevertheless, by TEM, Co3O4 nanoparticles of small size segregated on the external surface of the silicate were also observed for the higher metal loadings. The temperature dependence of the magnetization performed for the Co/M(2.5) sample allowed to assign its superparamagnetic behavior to the presence of clusters and Co3O4 nanoparticles of very small size that grow inside the MCM-41 mesopores. Therefore, the analyses presented in this work indicate that a Co theoretical loading of 2.5 wt% leads to the formation of Co oxide nanospecies in the MCM- 41 support with a particular superparamagnetic behavior. This sample with improved structural and magnetic properties result an attractive porous solid for drug hosting, to be applied in the field of the controlled release of medicaments.
format Articulo
Articulo
author Elías, Verónica
Cuello, Natalia
Andrini, Leandro Rubén
Requejo, Félix Gregorio
Oliva, Marcos
Eimer, Griselda
author_facet Elías, Verónica
Cuello, Natalia
Andrini, Leandro Rubén
Requejo, Félix Gregorio
Oliva, Marcos
Eimer, Griselda
author_sort Elías, Verónica
title Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization
title_short Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization
title_full Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization
title_fullStr Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization
title_full_unstemmed Advances in the study of nano-structured Co/MCM-41 materials: surface and magnetic characterization
title_sort advances in the study of nano-structured co/mcm-41 materials: surface and magnetic characterization
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/103893
work_keys_str_mv AT eliasveronica advancesinthestudyofnanostructuredcomcm41materialssurfaceandmagneticcharacterization
AT cuellonatalia advancesinthestudyofnanostructuredcomcm41materialssurfaceandmagneticcharacterization
AT andrinileandroruben advancesinthestudyofnanostructuredcomcm41materialssurfaceandmagneticcharacterization
AT requejofelixgregorio advancesinthestudyofnanostructuredcomcm41materialssurfaceandmagneticcharacterization
AT olivamarcos advancesinthestudyofnanostructuredcomcm41materialssurfaceandmagneticcharacterization
AT eimergriselda advancesinthestudyofnanostructuredcomcm41materialssurfaceandmagneticcharacterization
bdutipo_str Repositorios
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