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열 CVD법에 의한 CNTs/Metal/Al<sub>2</sub>O<sub>3</sub> 나노복합분말의 합성 및 특성
좌용호,유승화,양재교,오승탁,강성군,Choa Yong-Ho,Yoo Seung-Hwa,Yang Jae-Kyo,Oh Sung-Tag,Kang Sung-Goon 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.2
An optimum route to synthesize $Al_2O_3$-based composite powders with homogeneous dispersion of carbon nanotubes (CNTs) was investigated. CNTs/Metal/$Al_2O_3$ nanocomposite powders were fabricated by thermal chemical vapor deposition of $C_2H_2$ gas over metal/$Al_2O_3$ nanocomposite catalyst prepared by selective reduction of metal oxide/$Al_2O_3$ powders. The FT-Raman spectroscopy analysis revealed that the CNTs have single- and multi-walled structure. The CNTs with the diameter of 25-43 nm were homogeneously distributed in the metal/$Al_2O_3$ powders, and their characteristics were strongly affected by a kind of metal catalyst and catalyst size. The experimental results show that the composite powder with required size and dispersion of CNTs can be realized by control of synthesis condition.
Surface modification of magnetite nanoparticles for immobilization with lysozyme
좌용호,M.-J. Kim,B. Lim,Y.-K. Jeong,조용우 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.4
The surface of magnetite (Fe3O4) nanoparticles prepared by a co-precipitation method was modified by the carboxylic acid group of meso-2,3-dimercaptosuccinic acid (DMSA). The egg white lysozyme was then immobilized on the carboxylic acid group-modified magnetite nanoparticles. The magnetite nanoparticles were approximately 10 nm and had a spherical morphology and uniform size distribution. The concentration of lysozyme on the modified magnetite nanoparticles was also investigated by a UV-Vis spectrometer and compared to that of magnetite nanoparticles without surface modification.
좌용호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Low-dimensional electrical and thermal conductive materials are using vital components of electronics such as electronic circuits, thermal interface materials, transparent electrode, optical devices, etc. We herein summarise the recent advances in our lab. on the percolation networks of nanoscale conductive fillers in polymeric media. Based on 3-D percolation structures, the choice of a more appropriate nanomaterial with a lower percolation threshold can produce highly conductive nanocomposites for various applications, and the materials design can be guided to exploit the full potential of a certain kind of a electrical and thermal conductive filler. After focussing the geometric features (dimension, aspect ratio and size) dependent properties of fillers/polymer matrix and their implications, we highlight unique 3-D percolated techniques that are used to improve the electrical and thermal pathway between the conductive filler materials.
Choa,Y.H.,Niihara,K. 국립경상대학교 공과대학 부설 첨단소재연구소 1998 尖端素材 Vol.8 No.-
Plastic deformation as thermal residual stress relaxation was observed by TEM around interface of intragranular SiC particles in the Al₂O₃matrix for Al₂O₃/SiC nanocompo site system. The dislocations are generated at selected planes and there is a tendency far the dislocations to form a subgrain boundary structure with low-angle grain bound aries and networks. In this experiment, dislocation generated in the Al₂O₃matrix during down from sintering temperatures by the highly localized thermal stresses within and/or around SiC particles caused from the thermal expansion mismatch between Al₂O₃matrix and SiC particle was observed. In monolithic Al₂O₃and Al₂O₃/SiC microcomposite system, however, the dislocation formation was not observed compared to Al₂O₃/SiC nanocompo site system. These phenomena is closely related to the plastic relaxation of the elastic stress and strain energy associated with both thermal misfitting inclusions and creep behaviors. The plastic relaxation behavior was explained by combination of yield stress and internal stress.