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        검색결과 6

        1.
        2012.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Single crystalline Cu nanowires with controlled diameters and aspect ratios have been synthesized using electrochemical deposition within confined nanochannels of a porous anodic aluminium oxide(AAO) template. The diameters of nano-sized cylindrical pores in AAO template were adjusted by controlling the anodization conditions. Cu nanowires with diameters of approximately 38, 99, 274 nm were synthesized by the electrodeposition using the AAO templates. The crystal structure, morphology and microstructure of the Cu nanowires were systematically investigated using XRD, FE-SEM, TEM and SAED. Investigation results revealed that the Cu nanowires had the controlled diameter, high aspect ratio and single crystalline nature.
        4,000원
        2.
        2012.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this study, an oxygen plasma treatment was used as a low temperature debinding method to form a conductive copper feature on a flexible substrate using a direct printing process. To demonstrate this concept, conductive copper patterns were formed on polyimide films using a copper nanoparticle-based paste with polymeric binders and dispersing agents and a screen printing method. Thermal and oxygen plasma treatments were utilized to remove the polymeric vehicle before a sintering of copper nanoparticles. The effect of the debinding methods on the phase, microstructure and electrical conductivity of the screen-printed patterns was systematically investigated by FE-SEM, TGA, XRD and four-point probe analysis. The patterns formed using oxygen plasma debinding showed the well-developed microstructure and the superior electrical conductivity compared with those of using thermal debinding.
        4,000원
        3.
        2012.08 KCI 등재 구독 인증기관 무료, 개인회원 유료
        nanotubes were successfully synthesized using an electrospinning technique followed by calcination in air. The nanotubes were the single phase nature of and consisted of approximately 14 nm nanocrystals. SEM and TEM characterizations demonstrated that uniform hollow fibers with an average outer diameter of around 124 nm and wall thickness of around 25 nm were successfully obtained. As anode materials for lithium ion batteries, the nanotubes exhibited excellent cyclability and reversible capacity of up to 25 cycles at as compared to nanoparticles with a capacity of . Such excellent performance of the nanotube was related to the one-dimensional hollow structure which acted as a buffer zone during the volume contraction and expansion of Sn.
        4,000원
        4.
        2010.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        A new High Frequency Induction Heating (HFIH) process has been developed to fabricate dense reinforced with Fe-Ni magnetic metal dispersion particles. The process is based on the reduction of metal oxide particles immediately prior to sintering. The synthesized /Fe-Ni nanocomposite powders were formed directly from the selective reduction of metal oxide powders, such as NiO and . Dense /Fe-Ni nanocomposite was fabricated using the HFIH method with an extremely high heating rate of . Phase identification and microstructure of nanocomposite powders and sintered specimens were determined by X-ray diffraction and SEM and TEM, respectively. Vickers hardness experiment were performed to investigate the mechanical properties of the /Fe-Ni nanocomposite.
        4,000원
        5.
        2010.04 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this study, we successfully synthesized a nano-sized lanthanum-modified lead-titanate (PLT) powder with a perovskite structure using a high-energy mechanochemical process (MCP). In addition, the sintering behavior of synthesized PLT nanopowder was investigated and the sintering temperature that can make the full dense PLT specimen decreased to below by using powder as sintering agent. The pure PLT phase of perovskite structure was formed after MCP was conducted for 4 h and the average size of the particles was approximately 20 nm. After sintered at 1050 and , the relative density of PLT was about 93.84 and 95.78%, respectively. The density of PLT increased with adding and the specimen with the relative densitiy over 96% were fabricated below when 2 wt% of was added.
        4,000원
        6.
        2012.07 서비스 종료(열람 제한)
        Miscanthus is one of the important crops for bioenergy feedstock. Applicable molecular makers would be useful for development of valuable cultivar with enhanced biomass. Microsatellites as a co-dominant are widely useful for many applications in plant genetics and breeding such as genetic diversity analysis, cultivar identification, and marker-assisted selection. In order to develop novel EST-SSR markers for genetic improvement, we obtained the EST sequence data from the constructed cDNA libraries using a leaf and rhizome organs in the M.sinensis and M.sacchariflorus. SSR motifs were identified by SSR search-module program SciRoKo software. The number of SSR motifs was 1,724 in M.sinensis (leaf: 948, rhizome: 776) and 1,158 in M.sacchariflorus (leaf: 549, rhizome: 609). The most common repeat was tri-nucleotide followed by tetra-, di-, penta-nucleotide. CCG and AGC motifs were detected the most abundant repeat type in tri-nucleotide. We used an ORF Predictor program to screen the SSR location in the genome. The majority of the motifs were located in the ORF regions than the untranslated regions (UTRs). Especially, the tri-nucleotide was localized in the ORF regions, whereas di- and tetra-nucleotide were frequent in UTR regions. Based on SSR-containing sequence of the M.sinensis (leaf), 228 primer pairs were designed using Primer3 program. Randomly selected 20 primer pair was firstly screened using genomic DNA for their effectiveness to amplify SSR fragments of the expected size and to detect allele polymorphism. Fourteen out of total twenty primer pairs (70%) were successfully amplified. The remaining SSRs will be further screened and reported. When confirmed, those SSRs will be used for studying genetic diversity of the collected Miscanthus germplasm.