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      • KCI등재후보

        Calcium silicate-carbon nanotube composites

        T. Borrmann,K. Edgar,J. L. Spencer,A. J. McFarlane,J. H. Johnston 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4

        Composites of calcium silicate and carbon nanotubes have been generated. The nanotubes are multi-walled and grow on catalytichematite particles, which have been deposited on the calcium silicate carrier previously. Randomly curled as well as straightnanotubes have been observed.The nano-structured calcium silicate crystallizes at the elevated temperature and reaction conditions used in the formation of thecarbon nanotubes. The silicate forms wollastonite, therefore reducing the high surface area of the amorphous material. Variouscarbon sources have been explored, which allow catalysis at lower temperatures.

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        Electronic properties of intrinsically conducting polymer-cellulose based composites

        M.J. Richardson,J.H. Johnston,T. Borrmann 한국물리학회 2006 Current Applied Physics Vol.6 No.3

        In situ polymerisation of pyrrole, aniline and derivatives with cellulosic substrates provides composites with potentially useful properties. Conductivity relative to the untreated substrate is increased, and an inverse relationship of conductivity to dielectric, and hence capacitance is observed. A metallic layer such as copper may be deposited electrochemically onto the surface of the composite, and the metal surface may then be oxidised to form either the green carbonate patina commonly seen on bronze statues, or a deep red oxide layer. When the polymer used is polypyrrole, silver may be reduced onto the surface following reduction of the polymer via hydrazine or sodium borohydride. The composites have been characterised via scanning electron microscopy, impedance analysis, cyclic voltammetry and conductivity measurements.

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