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Nanostructured cobalt materials have recently attracted considerable attention due to their potential applications in high-density data storage, magnetic separation and heterogeneous catalysts. The size as well as the morphology at the nano scale strongly influences the physical and chemical properties of cobalt nano materials. In this study, cobalt nano particles synthesized by a a polyol process, which is a liquid-phase reduction method, were investigated. Cobalt hydroxide ($Co(OH)_2$), as an intermediate reaction product, was synthesized by the reaction between cobalt sulphate heptahydrate ($CoSO_4{\cdot}7H_2O$) used as a precursor and sodium hydroxide (NaOH) dissolved in DI water. As-synthesized $Co(OH)_2$ was washed and filtered several times with DI water, because intermediate reaction products had not only $Co(OH)_2$ but also sodium sulphate ($Na_2SO_4$), as an impurity. Then the cobalt powder was synthesized by diethylene glycol (DEG), as a reduction agent, with various temperatures and times. Polyvinylpyrrolidone (PVP), as a capping agent, was also added to control agglomeration and dispersion of the cobalt nano particles. The optimized synthesis condition was achieved at $220^{\circ}C$ for 4 hours with 0.6 of the PVP/$Co(OH)_2$ molar ratio. Consequently, it was confirmed that the synthesized nano sized cobalt particles had a face centered cubic (fcc) structure and with a size range of 100-200 nm.
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참고문헌 (17)
참고문헌 신청
S. M. Shin / 2008 / Trends in Metals and Materials Engineering 21(3):26
M. S. -Niasari / 2009 / J. Magn. Magn. Mater 320:575
최철진 / 2004 / 화학기상응축공정(Chemical Vapor Condensation)으로 제조된 Co 나노분말의 미세구조 및 자기적 성질에 미치는 운송기체의 영향 / 한국분말야금학회지 11(1):16~21
Z. H. Wang / 2003 / J. Alloy. Comp 351:319
Y. Li / 2010 / Int. J. Refractory Metals and Hard Materials 28:270
M. S. -Niasari / 2009 / J. Magn. Magn. Mater 320:575
최철진 / 2004 / 화학기상응축공정(Chemical Vapor Condensation)으로 제조된 Co 나노분말의 미세구조 및 자기적 성질에 미치는 운송기체의 영향 / 한국분말야금학회지 11(1):16~21
Z. H. Wang / 2003 / J. Alloy. Comp 351:319
Y. Li / 2010 / Int. J. Refractory Metals and Hard Materials 28:270
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