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Nanoparticles: Small 8/2010
Author(s) -
Delattre Anastasia,
Pouget Stéphanie,
Jacquot JeanFrançois,
Samson Yves,
Reiss Peter
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201090024
Subject(s) - nanoparticle , materials science , annealing (glass) , colloid , dissolution , ethylene glycol , chemical engineering , aqueous solution , nanotechnology , chemistry , composite material , engineering
The cover picture shows a Z‐contrast high‐resolution STEM image of a 16‐nm FePt nanoparticle, acquired with a probe Cs‐corrected FEI Titan on the Minatec nanocharacterization platform. Individual alternating Fe and Pt planes are visible, which are characteristic of the chemically ordered L 1 0 phase presenting high magnetocrystalline anisotropy. In order to obtain this phase, the FePt nanoparticles – in the disordered fcc phase of low anisotropy after chemical synthesis – are subjected to thermal annealing. While coalescence is prevented by a matrix of micrometric salt particles during the heat treatment, the nanoparticles' surface ligands are destroyed. The addition of an aqueous solution of the amino acid cysteine to the crude salt/nanoparticle mixture enables the simultaneous dissolution of the salt particles and the colloidal stabilization of the annealed FePt nanoparticle trough electrostatic repulsion. For more information, please read the Communication “Stable Colloidal Solutions of High‐Temperature‐Annealed L 1 0 FePt Nanoparticles” by P. Reiss et al., beginning on page 932 . Image credits: A. Zarafshar, T. Leong, N. Bassik, J. Cho, and D. Gracias.