Nanocolloids of the intermetallic beta-CoAl phase were prepared by a soft organometallic route. They were fully characterized by (HR)TEM, EDX, WAXS, XAS and SQUID magnetometry. Their exposure to air led to an increased saturation magnetization in agreement with Co/Al segregation and the formation of Co/Al(2)O(3) nanocomposite. Furthermore, the beta-CoAl nanoparticles could be used as seeds to grow an aluminum overlayer, which passivated the alloyed core against oxidation. These nanoparticles yielded stable colloidal solutions in aromatic solvents.
Organometallic Synthesis of beta-CoAl Nanoparticles and beta-CoAl/Al Nanoparticles and Their Behaviour upon Air Exposure
FALQUI, ANDREA;
2010-01-01
Abstract
Nanocolloids of the intermetallic beta-CoAl phase were prepared by a soft organometallic route. They were fully characterized by (HR)TEM, EDX, WAXS, XAS and SQUID magnetometry. Their exposure to air led to an increased saturation magnetization in agreement with Co/Al segregation and the formation of Co/Al(2)O(3) nanocomposite. Furthermore, the beta-CoAl nanoparticles could be used as seeds to grow an aluminum overlayer, which passivated the alloyed core against oxidation. These nanoparticles yielded stable colloidal solutions in aromatic solvents.
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