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Improving the magnetic heating by disaggregating nanoparticles

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Arteaga Cardona, F. and Rojas Rojas, K. and Méndez Rojas, M. A. and Hernando Grande, Antonio and Presa Muñoz del Toro, Patricia de la (2016) Improving the magnetic heating by disaggregating nanoparticles. Journal of Alloys and Compounds, 663 . pp. 636-644. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2015.10.285


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Abstract

Recently, potential applications of the magnetic heating for heterogeneous catalysis or organic synthesis have been reported. As these new applications are not limited by biocompatibility requirements, a wide range of possibilities for non-aqueous colloidal nanoparticles with enhanced magnetic properties is open. In this work, manganese and cobalt ferrite nanoparticles are synthesized by co-precipitation method with average particle size around 12 nm. The particles are either coated with tetramethylammonium hydroxide (TMAOH) and dispersed in water or with oleic acid (OA) and dispersed in hexane to produce aggregated or disaggregated nanoparticles, respectively. It is observed that the particle disaggregation improves significantly the heating efficiency from 12 to 96 W/g in the case of cobalt ferrite, and from 120 to 413 W/g for the manganese ferrite. The main responsible for this improvement is the reduction of hydrodynamic volume that allows a faster Brownian relaxation. This work also discusses the relevance of the size distribution.


Item Type:Article
Additional Information:

© 2016 Elsevier B.V.
This work was supported by grants from the Spanish Ministry of Science and Innovation (MAT2012-37109-C02-01), and Fundación Mutua Madrileña (Spain).

Uncontrolled Keywords:Physical chemistry; Materials science, Multidisciplinary; Metallurgy; Metallurgical engineering.
Subjects:Sciences > Physics > Materials
ID Code:36519
Deposited On:30 Mar 2016 15:42
Last Modified:05 Apr 2018 23:01

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