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Nearly Monodispersion CoSm Alloy Nanoparticles Formed by an In-situ Rapid Cooling and Passivating Microfluidic Process

Song, Yujun and Henry, Laurence L. (2009) Nearly Monodispersion CoSm Alloy Nanoparticles Formed by an In-situ Rapid Cooling and Passivating Microfluidic Process. Nanoscale Research Letters, 4 (10). pp. 1130-1134. ISSN 1931-7573 (Print) 1556-276X (Online)

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Official URL: http://www.springerlink.com/content/988362112v012h...

Abstract

An in situ rapid cooling and passivating microfluidic process has been developed for the synthesis of nearly monodispersed cobalt samarium nanoparticles (NPs) with tunable crystal structures and surface properties. This process involves promoting the nucleation and growth of NPs at an elevated temperature and rapidly quenching the NP colloids in a solution containing a passivating reagent at a reduced temperature. We have shown that Cobalt samarium NPs having amorphous crystal structures and a thin passivating layer can be synthesized with uniform nonspherical shapes and size of about 4.8 nm. The amorphous CoSm NPs in our study have blocking temperature near 40 K and average coercivity of 225 Oe at 10 K. The NPs also exhibit high anisotropic magnetic properties with a wasp-waist hysteresis loop and a bias shift of coercivity due to the shape anisotropy and the exchange coupling between the core and the thin oxidized surface layer.

Item Type:Article
Uncontrolled Keywords:Nanoparticles - Microfluidic reactor - Synthesis - Monodispersion - Alloy - Cobalt - Samarium
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
ID Code:7143
Deposited By:Lesley Tobin
Deposited On:26 Oct 2009 12:29
Last Modified:26 Oct 2009 12:29

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