Physics – Condensed Matter – Materials Science
Scientific paper
2007-03-19
Nanotechnology 18 (2007) 285606
Physics
Condensed Matter
Materials Science
Regular paper submited to international peer-reveiwed journal
Scientific paper
10.1088/0957-4484/18/28/285606
In view of potential applications of magnetic particles in biomedicine and electromagnetic devices, we made use of the classical Stober method base-catalysed hydrolysis and condensation of tetraethoxysilane (TEOS) to encapsulate FeNi nanoparticles within a silica shell. An original stirring system under high power ultrasounds made possible to disperse the otherwise agglomerated particles. Sonication guaranteed particles to remain dispersed during the Stober synthesis and also improved the efficiency of the method. The coated particles are characterized by electron microscopy (TEM) and spectroscopy (EDX) showing a core-shell structure with a uniform layer of silica. Silica-coating does not affect the core magnetic properties. Indeed, all samples are ferromagnetic at 77 K and room temperature and the Curie point remains unchanged. Only the coercive force shows an unexpected non-monotonous dependence on silica layer thickness.
Ammar Mahdi
Audebert Patrick
Bonnet J. P.
Brosseau A.
Champion Y.
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