Positive microemulsion synthesis and magnetic property of amorphous multicomponent Co-, Ni- and Cu-based alloy nanoparticles
作者： Ming Wen , Qiu-Yan Liu , Ya-Fen Wang , Yuan-Zheng Zhu , Qing-Sheng Wu
DOI: 10.1016/J.COLSURFA.2007.12.041
关键词: Amorphous solid 、 Amorphous metal 、 Nanoparticle 、 Dispersity 、 Alloy 、 Coercivity 、 Microemulsion 、 Crystallization 、 Metallurgy 、 Chemical engineering 、 Materials science 、 Colloid and Surface Chemistry
摘要: Abstract Using oleic acid as stabilizer, the monodisperse Co–Ni–Cu amorphous alloys nanoparticles were synthesized by reduction of CuSO4·5H2O, NiCl2·6H2O and CoCl2·6H2O with KBH4 in positive microemulsion (hexane/sodium oleate/water) system. All results show that as-synthesized spherical particles are air-stable alloy room temperature size 4–7 nm narrow deviation, coated acid. These have unique soft magnetic property small coercivity (Hc) 7.94 Oe for CuNi, 37.65 Oe CoCu, 42.17 Oe CoNiCu 65.09 Oe CoNi, respectively. After annealed at 923 K 0.5 h, Hc CoNi increased significantly to 46.7, 370.04, 337.4 305.5 Oe, It corresponds crystallization nanoparticles.
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