Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia

Magnetite (Fe3O4) nanoparticles are proper materials for Magnetic Fluid Hyperthermia applications whenever these conjugate stability at physiological (neutral pH) medium and high specific dissipation power. Here, magnetite nanoparticles 9–12 nm in size, electrostatically stabilized by citric acid co...

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Detalles Bibliográficos
Autores principales:	Sousa, María Elisa Liliana de, Fernández Van Raap, Marcela, Rivas, Patricia, Mendoza Zélis, Pedro, Girardin, Pablo, Pasquevich, Gustavo Alberto, Alessandrini, José Luis, Muraca, Diego, Sánchez, Francisco Homero
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2013
Materias:	Física Nanoparticle Ferrofluid Magnetic hyperthermia Magnetite Citric acid coating
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/101335 https://ri.conicet.gov.ar/11336/23723 http://pubs.acs.org/doi/abs/10.1021/jp311556b
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-101335
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Física Nanoparticle Ferrofluid Magnetic hyperthermia Magnetite Citric acid coating
spellingShingle	Física Nanoparticle Ferrofluid Magnetic hyperthermia Magnetite Citric acid coating Sousa, María Elisa Liliana de Fernández Van Raap, Marcela Rivas, Patricia Mendoza Zélis, Pedro Girardin, Pablo Pasquevich, Gustavo Alberto Alessandrini, José Luis Muraca, Diego Sánchez, Francisco Homero Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
topic_facet	Física Nanoparticle Ferrofluid Magnetic hyperthermia Magnetite Citric acid coating
description	Magnetite (Fe3O4) nanoparticles are proper materials for Magnetic Fluid Hyperthermia applications whenever these conjugate stability at physiological (neutral pH) medium and high specific dissipation power. Here, magnetite nanoparticles 9–12 nm in size, electrostatically stabilized by citric acid coating, with hydrodynamic sizes in the range 17–30 nm, and well dispersed in aqueous solution were prepared using a chemical route. The influence of media acidity during the adsorption of citric acid (CA) on the suspension’s long-term stability was systematically investigated. The highest content of nanoparticles in a stable suspension at neutral pH is obtained for coating performed at pH = 4.58, corresponding to the larger amount of CA molecules adsorbed by one carboxylate link. Specific absorption rates (SARs) of various magnetite colloids, determined calorimetrically at a radio frequency field of 265 kHz and field amplitude of 40.1 kA/m, are analyzed in terms of structural and magnetic colloid properties. Larger dipolar interactions lead to larger Néel relaxation times, in some cases larger than Brown relaxation times, which in the present case enhanced magnetic radio frequency heating. The improvement of suspension stability results in a decrease of SAR values, and this decrease is even large in comparison with uncoated magnetite nanoparticles. This fact is related to interactions between particles.
format	Articulo Preprint
author	Sousa, María Elisa Liliana de Fernández Van Raap, Marcela Rivas, Patricia Mendoza Zélis, Pedro Girardin, Pablo Pasquevich, Gustavo Alberto Alessandrini, José Luis Muraca, Diego Sánchez, Francisco Homero
author_facet	Sousa, María Elisa Liliana de Fernández Van Raap, Marcela Rivas, Patricia Mendoza Zélis, Pedro Girardin, Pablo Pasquevich, Gustavo Alberto Alessandrini, José Luis Muraca, Diego Sánchez, Francisco Homero
author_sort	Sousa, María Elisa Liliana de
title	Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
title_short	Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
title_full	Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
title_fullStr	Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
title_full_unstemmed	Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
title_sort	stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia
publishDate	2013
url	http://sedici.unlp.edu.ar/handle/10915/101335 https://ri.conicet.gov.ar/11336/23723 http://pubs.acs.org/doi/abs/10.1021/jp311556b
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Stability and relaxation mechanisms of citric acid coated magnetite nanoparticles for magnetic hyperthermia

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