Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach

Optical extinction is a handy and ubiquitous technique that allows us to study colloidal nanoparticles in their native state. The typical analysis of the extinction spectrum can be extended in order to obtain structural information of the sample such as the size distribution of the cores and the thi...

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Autores principales: Mendoza Herrera, Luis Joaquín, Bruvera, Ignacio Javier, Scaffardi, Lucía Beatriz, Schinca, Daniel Carlos
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2016
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/102216
https://ri.conicet.gov.ar/11336/49305
http://pubs.rsc.org/en/Content/ArticleLanding/2017/CP/C6CP08260B
Aporte de:
id I19-R120-10915-102216
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Magnetic core nanoparticles
Eddy currents
Optical extinction spectroscopy
spellingShingle Física
Magnetic core nanoparticles
Eddy currents
Optical extinction spectroscopy
Mendoza Herrera, Luis Joaquín
Bruvera, Ignacio Javier
Scaffardi, Lucía Beatriz
Schinca, Daniel Carlos
Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach
topic_facet Física
Magnetic core nanoparticles
Eddy currents
Optical extinction spectroscopy
description Optical extinction is a handy and ubiquitous technique that allows us to study colloidal nanoparticles in their native state. The typical analysis of the extinction spectrum can be extended in order to obtain structural information of the sample such as the size distribution of the cores and the thickness of the coating layers. In this work the extinction spectra of Fe3O4, Fe3O4@Au, and Fe3O4@SiO2@Au single and multilayer nanoparticles are obtained by solving full Mie theory with a frequency dependent susceptibility derived from the Gilbert equation and considering the effect of Eddy currents. The results are compared with non-magnetic Mie theory, magnetic dipolar approximation and magnetic Mie theory without Eddy currents. The particle size-wavelength ranges of validity of these different approaches are explored and novel results are obtained for Eddy current effects in optical extinction. These results are used to obtain particle size and shell thickness information from the experimental extinction spectra of Fe3O4 and Fe3O4@Au nanoparticles in good agreement with TEM results, and to predict the plasmon peak parameters for Fe3O4@SiO2@Au three layer nanoparticles.
format Articulo
Preprint
author Mendoza Herrera, Luis Joaquín
Bruvera, Ignacio Javier
Scaffardi, Lucía Beatriz
Schinca, Daniel Carlos
author_facet Mendoza Herrera, Luis Joaquín
Bruvera, Ignacio Javier
Scaffardi, Lucía Beatriz
Schinca, Daniel Carlos
author_sort Mendoza Herrera, Luis Joaquín
title Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach
title_short Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach
title_full Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach
title_fullStr Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach
title_full_unstemmed Sizing and Eddy currents in magnetic core nanoparticles: an optical extinction approach
title_sort sizing and eddy currents in magnetic core nanoparticles: an optical extinction approach
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/102216
https://ri.conicet.gov.ar/11336/49305
http://pubs.rsc.org/en/Content/ArticleLanding/2017/CP/C6CP08260B
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AT scaffardiluciabeatriz sizingandeddycurrentsinmagneticcorenanoparticlesanopticalextinctionapproach
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