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Promotion of grain growth in NiFe<sub>2</sub>O<sub>4</sub> by annealing with oleic acid
Kurosawa, R.,Suzuki, T.,Nakayama, T.,Suematsu, H.,Niihara, K.,Jeong, Y.K.,Kim, K.H. Elsevier 2012 Current Applied Physics Vol.12 No.suppl2
For investigation of the grain-size dependence on magnetization, NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles were heated at 440 <SUP>o</SUP>C, 600 <SUP>o</SUP>C, 800 <SUP>o</SUP>C, and 1000 <SUP>o</SUP>C with and without oleic acid. It was recognized that the median diameter (D<SUB>50</SUB>) increased from 5.9 to 145.9 nm by the heat treatments from 440 to 1000 <SUP>o</SUP>C. In addition, it was confirmed that NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles after the heat treatment with oleic acid at 600 <SUP>o</SUP>C have higher grain growth rate than that after only heat treatment without oleic acid. It was deduced that NiFe<SUB>2</SUB>O<SUB>4</SUB> was dissolved in oleic acid, so that sintering speed became fast. From these results, it was concluded that the formally observed saturation magnetization increase in heat treated NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles with oleic acid was caused partly by grain growth enhancement with the presence of oleic acid.
Preparation of copper nanoparticles with an organic coating by a pulsed wire discharge method
K. Murai,Y. Watanabe,Y. Saito,T. Nakayama,H. Suematsu,W. Jiang,K. Yatsui,심광보,코이치니하라 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.2
In the pulsed wire discharge method, a coating technique to prepare metal nanoparticles covered with organic matter has been investigated. Copper nanoparticles covered with organic matter have been successfully prepared by evaporation of a copper wire in an oleic acid vapor/mist. The thickness of the coating layer was a few nanometres. The median diameter of the powder was 25 nm, and became 10 nm smaller than that without the coating because of the inhibition of particle growth by the formation of the coating. From phase identification by transmission electron microscopy and X-ray diffraction analysis, it was found that the copper nanoparticles have been passivated and have not been oxidized in over 2 months. In the pulsed wire discharge method, a coating technique to prepare metal nanoparticles covered with organic matter has been investigated. Copper nanoparticles covered with organic matter have been successfully prepared by evaporation of a copper wire in an oleic acid vapor/mist. The thickness of the coating layer was a few nanometres. The median diameter of the powder was 25 nm, and became 10 nm smaller than that without the coating because of the inhibition of particle growth by the formation of the coating. From phase identification by transmission electron microscopy and X-ray diffraction analysis, it was found that the copper nanoparticles have been passivated and have not been oxidized in over 2 months.