The Synthesis of Silica-Coated Permalloy Nanoparticles Using a Water-in-Oil Microemulsion


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A water-in-oil microemulsion method was used for the preparation of silica-coated permalloy (Ni0.80Fe0.20) nanoparticles. The particles were prepared by the reduction of their salts with sodium borohydride NaBH4 in a cationic water-in-oil (w/o) microemulsion of water/cetyltrimethyl- amonium bromide (CTAB) and n-butanol/isooctane at 25oC. According to the TEM and x-ray diffraction analyses, the synthesized material was in the form of nanoparticles. The magnetization of the silica-coated nanoparticles was lower than that of the uncoated particles, reflecting the influence of the nonmagnetic silica surface layer on the magnetization.



Edited by:

Dragan P. Uskokovic, Slobodan K. Milonjic, Djan I. Rakovic




I. Ban et al., "The Synthesis of Silica-Coated Permalloy Nanoparticles Using a Water-in-Oil Microemulsion ", Materials Science Forum, Vol. 494, pp. 161-166, 2005

Online since:

September 2005




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