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Stable core shell Co3Fe7 – CoFe2O4 nanoparticles synthesized via flame spray pyrolysis approach / Yunfeng Li in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11157-11162 Titre : Stable core shell Co3Fe7 – CoFe2O4 nanoparticles synthesized via flame spray pyrolysis approach Type de document : texte imprimé Auteurs : Yunfeng Li, Auteur ; Yanjie Hu, Auteur ; Junchao Huo, Auteur Année de publication : 2012 Article en page(s) : pp. 11157-11162 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Pyrolysis  Flame  Nanoparticle Résumé : Air stable Co3Fe7―CoFe2O4 nanoparticles have been synthesized via one-step flame spray pyrolysis of a mixture of Fe/Co precursor solution under stronger reducing atmosphere. The as-synthesized nanoparticles with diameters of 20-80 nm showed a typical core shell structure and high stability for being one month in air, whose metallic Co3Fe7 cores were protected against oxidation by a surface shell of about 2―4 nm cobalt iron oxide (CoFe2O4). The ratio of metallic Fe/Co alloy nanoparticles was 7:3. The alloy nanoparticles exhibited enhanced saturation magnetization (126.1 emu/g), compared with flame sprayed iron nanoparticles with the same conditions. The formation process of metallic alloy nanoparticles with core-shell structure was investigated, which included three stages: flame combustion, reducing, and surface oxidation during the flame process. It is reckoned that such a continuous production approach is an effective way to produce the stable Co3Fe7 alloy nanoparticles with high saturation magnetization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299441 [article] Stable core shell Co3Fe7 – CoFe2O4 nanoparticles synthesized via flame spray pyrolysis approach [texte imprimé] / Yunfeng Li, Auteur ; Yanjie Hu, Auteur ; Junchao Huo, Auteur . - 2012 . - pp. 11157-11162. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11157-11162 Mots-clés : Pyrolysis  Flame  Nanoparticle Résumé : Air stable Co3Fe7―CoFe2O4 nanoparticles have been synthesized via one-step flame spray pyrolysis of a mixture of Fe/Co precursor solution under stronger reducing atmosphere. The as-synthesized nanoparticles with diameters of 20-80 nm showed a typical core shell structure and high stability for being one month in air, whose metallic Co3Fe7 cores were protected against oxidation by a surface shell of about 2―4 nm cobalt iron oxide (CoFe2O4). The ratio of metallic Fe/Co alloy nanoparticles was 7:3. The alloy nanoparticles exhibited enhanced saturation magnetization (126.1 emu/g), compared with flame sprayed iron nanoparticles with the same conditions. The formation process of metallic alloy nanoparticles with core-shell structure was investigated, which included three stages: flame combustion, reducing, and surface oxidation during the flame process. It is reckoned that such a continuous production approach is an effective way to produce the stable Co3Fe7 alloy nanoparticles with high saturation magnetization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299441