Magnetite and magnetite/silver core/shell nanoparticles with diluted magnet-like behavior

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.10.019· OSTI ID:21372454

Garza-Navarro, Marco ^[1]; Torres-Castro, Alejandro ^[1]; Gonzalez, Virgilio; Ortiz, Ubaldo ^[1]; De la Rosa, Elder ^[2]

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1. Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon, Av. Universidad s/n, Cd. Universitaria, San Nicolas de los Garza, Nuevo Leon 66450 (Mexico)
2. Centro de Investigaciones en Optica, A.P. 1-948, Leon Gto. 37160 (Mexico)

In the present work is reported the use of the biopolymer chitosan as template for the preparation of magnetite and magnetite/silver core/shell nanoparticles systems, following a two step procedure of magnetite nanoparticles in situ precipitation and subsequent silver ions reduction. The crystalline and morphological characteristics of both magnetite and magnetite/silver core/shell nanoparticles systems were analyzed by high resolution transmission electron microscopy (HRTEM) and nanobeam diffraction patterns (NBD). The results of these studies corroborate the core/shell morphology and the crystalline structure of the magnetite core and the silver shell. Moreover, magnetization temperature dependent, M(T), measurements show an unusual diluted magnetic behavior attributed to the dilution of the magnetic ordering in the magnetite and magnetite/silver core/shell nanoparticles systems. - Graphical abstract: Biopolymer chitosan was used as stabilization media to synthesize both magnetite and magnetite/silver core/shell nanoparticles. Results of HRTEM and NBD patterns confirm core/shell morphology of the obtained nanoparticles. It was found that the composites show diluted magnet-like behavior.

• OSTI ID: 21372454
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 1; Other Information: DOI: 10.1016/j.jssc.2009.10.019; PII: S0022-4596(09)00503-9; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
AMINO ACIDS
MAGNETITE
MORPHOLOGY
NANOSTRUCTURES
OLIGOSACCHARIDES
PRECIPITATION
SHELLS
SILVER
SILVER IONS
TRANSMISSION ELECTRON MICROSCOPY
CARBOHYDRATES
CARBOXYLIC ACIDS
CHARGED PARTICLES
ELECTRON MICROSCOPY
ELEMENTS
IONS
IRON ORES
METALS
MICROSCOPY
MINERALS
ORES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDE MINERALS
SACCHARIDES
SEPARATION PROCESSES
TRANSITION ELEMENTS