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Stabilization of superparamagnetic nickel nanoparticles in a sepiolite matrix

Esteban-Cubillo, A. and Pina-Zapardiel, R. and Moya, Jose S. and Pecharroman, Carlos (2010) Stabilization of superparamagnetic nickel nanoparticles in a sepiolite matrix. Journal of Nanoparticle Research, 12 (4). pp. 1221-1229.

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Abstract

Superparamagnetic nickel-rich nanoparticles at room temperature have been obtained in a silicate matrix (sepiolite) by a chemical route. During the synthesis process, the control of the acid treatment of the matrix allows nickel cations being incorporated in different locations, into the octahedral site of the structural channels or being deposited onto the sepiolite surface. Thus, two different types of nickel nanoparticles have been obtained depending on the nature of the acid attack: small (~7nm) and embedded superparamagnetic, or large (~27nm) deposited single domain nickel nanoparticles for strong or weak acid attack, respectively. Moreover, the embedded nanoparticles have been revealed to possess a remarkable stability against complete oxidation. According to the usage of characterization techniques (transmission electron microscopy, X-ray diffraction and magnetic measurements), embedded nanoparticles seem to be coated with a non-ferromagnetic coating that hinders the oxygen diffusion.

Item Type:Article
Uncontrolled Keywords:MAGNETIC-PROPERTIES; NI-SIO2 NANOCOMPOSITES; COBALT NANOPARTICLES; IRON PARTICLES; EXCHANGE BIAS; SILICA; MONODISPERSE; CORE; ACID; SUPERLATTICES
Subjects:Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:8868
Deposited By:CSMNT
Deposited On:07 Jul 2010 12:30
Last Modified:19 Aug 2010 08:35

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