Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41

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This work reports a simple synthesis of a mesoporous ordered silica structure (MCM-41) grown up around pre-synthesized maghemite nanoparticles. A composite with magnetic response and high specific surface area was obtained adding maghemite nanoparticles coated with oleic acid in the synthesis gel of...

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Autores principales: Fellenz, Nicolás Antonio, Pérez de Berti, Ignacio Omar, Soldati, Analía L., Stewart, Silvana Jacqueline, Marchetti, Sergio Gustavo, Bengoa, José Fernando
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2015
Materias:
Química
Física
Sintering
Sol–gel processes
Nanocomposites
Magnetic properties
SiO2
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128693
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128693
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Física
Sintering
Sol–gel processes
Nanocomposites
Magnetic properties
SiO2
spellingShingle Química
Física
Sintering
Sol–gel processes
Nanocomposites
Magnetic properties
SiO2
Fellenz, Nicolás Antonio
Pérez de Berti, Ignacio Omar
Soldati, Analía L.
Stewart, Silvana Jacqueline
Marchetti, Sergio Gustavo
Bengoa, José Fernando
Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41
topic_facet Química
Física
Sintering
Sol–gel processes
Nanocomposites
Magnetic properties
SiO2
description This work reports a simple synthesis of a mesoporous ordered silica structure (MCM-41) grown up around pre-synthesized maghemite nanoparticles. A composite with magnetic response and high specific surface area was obtained adding maghemite nanoparticles coated with oleic acid in the synthesis gel of MCM-41 and finally calcining in air. Different characterizations techniques such as magnetic measurements, Mossbauer spectroscopy at 25 and −260 °C and transmission electron microscopy were used to study the magnetic and structural changes of the initial maghemite nanoparticles produced during its coverage with the mesoporous silica structure. The presence of the mesoporous structure inhibits the expected transformation from maghemite to hematite when the system was calcined in air at 510 °C. It was established that a sintering of the nanoparticles during the calcination step occurs, leading to a magnetization saturation value similar to that of the bulk compound. In order to evaluate the capability as adsorbent, the magnetic composite was subjected to a surface amino-functionalization and then tested for Cr(VI) and Cu(II) adsorption from water.
format Articulo
Preprint
author Fellenz, Nicolás Antonio
Pérez de Berti, Ignacio Omar
Soldati, Analía L.
Stewart, Silvana Jacqueline
Marchetti, Sergio Gustavo
Bengoa, José Fernando
author_facet Fellenz, Nicolás Antonio
Pérez de Berti, Ignacio Omar
Soldati, Analía L.
Stewart, Silvana Jacqueline
Marchetti, Sergio Gustavo
Bengoa, José Fernando
author_sort Fellenz, Nicolás Antonio
title Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41
title_short Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41
title_full Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41
title_fullStr Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41
title_full_unstemmed Changes on structural and magnetic properties of maghemite nanoparticles during their coverage with MCM-41
title_sort changes on structural and magnetic properties of maghemite nanoparticles during their coverage with mcm-41
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/128693
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bdutipo_str Repositorios
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