Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study

We report a structural study of magnetic colloids composed of CoFe₂O₄ nanoparticles (mean radii in the range 2–7 nm) synthesized by thermal decomposition of different high boiling temperature organic solvents in the presence of oleic acid and oleylamine, and subsequently re-suspended in hexane. Alth...

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Detalles Bibliográficos
Autores principales: Fernández van Raap, Marcela Beatriz, Mendoza Zélis, Pedro, Coral Coral, Diego Fernando, Torres, T. E., Marquina, Clara, Goya, Gerardo Fabián, Sánchez, Francisco Homero
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Exactas
Física
Magnetic colloids
Aggregation
Dipolar interaction
London–van der Waals interaction
Small angle X-ray scattering
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123777
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123777
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Magnetic colloids
Aggregation
Dipolar interaction
London–van der Waals interaction
Small angle X-ray scattering
spellingShingle Ciencias Exactas
Física
Magnetic colloids
Aggregation
Dipolar interaction
London–van der Waals interaction
Small angle X-ray scattering
Fernández van Raap, Marcela Beatriz
Mendoza Zélis, Pedro
Coral Coral, Diego Fernando
Torres, T. E.
Marquina, Clara
Goya, Gerardo Fabián
Sánchez, Francisco Homero
Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study
topic_facet Ciencias Exactas
Física
Magnetic colloids
Aggregation
Dipolar interaction
London–van der Waals interaction
Small angle X-ray scattering
description We report a structural study of magnetic colloids composed of CoFe₂O₄ nanoparticles (mean radii in the range 2–7 nm) synthesized by thermal decomposition of different high boiling temperature organic solvents in the presence of oleic acid and oleylamine, and subsequently re-suspended in hexane. Although the surfactant layer prevents permanent aggregation and precipitation of the disperse phase, competition between attractive interactions (i.e., dipolar and van der Waals) and repulsive steric interaction leads to self organization of the magnetic nanoparticles. Our small angle X-ray scattering results evidence the presence of distinctive self organized structures in the liquid colloid depending on the type of solvent used in the synthesis. A completely homogeneous dispersion is obtained for those colloids synthesized with benzyl-ether and octadecene. Bi-disperse systems, in which nanoclusters coexist with free nanoparticles, appear when phenyl-ether and trioctylamine are used. Chain-like structures are observed in a colloid containing the particles synthesized using phenyl-ether, while more compact 3D structures form in colloids prepared with particles synthesized with trioctylamine. The presented results have important implications in the design and selection of magnetic nanoparticles for those applications where the size dispersion determines the final efficiency of the material, such as magnetic fluid hyperthermia clinical therapy.
format Articulo
Articulo
author Fernández van Raap, Marcela Beatriz
Mendoza Zélis, Pedro
Coral Coral, Diego Fernando
Torres, T. E.
Marquina, Clara
Goya, Gerardo Fabián
Sánchez, Francisco Homero
author_facet Fernández van Raap, Marcela Beatriz
Mendoza Zélis, Pedro
Coral Coral, Diego Fernando
Torres, T. E.
Marquina, Clara
Goya, Gerardo Fabián
Sánchez, Francisco Homero
author_sort Fernández van Raap, Marcela Beatriz
title Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study
title_short Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study
title_full Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study
title_fullStr Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study
title_full_unstemmed Self organization in oleic acid-coated CoFe₂O₄ colloids: a SAXS study
title_sort self organization in oleic acid-coated cofe₂o₄ colloids: a saxs study
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/123777
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