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Cellulose/Graphene oxide nanocomposite films and fibers were prepared with graphene oxide (GO) and a so-called "Lyocell" method, and their structures and properties were studied by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), fourier transform spectroscopy (FT-IR), universal testing machine, thermo-gravimetric analyzer (TGA), 2-D x-ray diffraction, rotational?rheometer and conductometer to establish the structure and property relationship. The GO (functionalized by acid treatment with a mixture of sodium nitrate, sulfuric acid and potassium permanganate to form hydroxyl, epoxy and carboxylic groups on the surface of the graphite) were well dispersed in monohydrated N-methylmorpholine-N-Oxide (nMMO) (the solvent of cellulose) by sonication and mixed with cellulose to make the nanocomposite dope. Also, the graphene oxide were dispersed in nanocomposite dope due to the strong hydrogen bonds of the graphene oxide with nMMO and cellulose. The Lyocell / graphene oxide nanocomposites (which were cast on the glass and Dry-jet wet spinning with the composite dope and coagulated in the water) were annealed at 250 oC for thermal reduction. The reduction of GO to graphite by thermal annealing was confirmed by FT-IR, 2-D x-ray diffraction, XPS. The effects of the amount of the graphite in the composite film on the electrical conductivity and mechanical properties were studied. The annealed composite film showed good electrical conductivity and thermal conductivity. The Lyoecll / graphene oxide nanocompoiste fiber showed good mechanical properties with small amount graphene oxide. The improvement of the mechanical / thermal / electrical properties of the Lyocell / graphene oxide nanocomposite film and fiber made it possible to use as conducting electrode, electro magnetic interference (EMI), photodiodes, carbonization fiber, field effect transistors and heat sink materials.
김찬준 Korea Univ. 2003 국내박사
As the national economy becomes increasingly advanced, the amount of wastes being generated is rising rapidly in Korea. These problems have induced policy-makers to investigate the waste reduction alternatives. The overwhelming advantages of recycling such as lowering pollution levels, conserving energy, creating jobs, and building more competitive manufacturing industries are apparent. Therefore, the recycling of waste and the role of recycling firms have become all the more important in respect to resource scarcity and final waste processing residues. In order to activate the recycling industry, a public utility (KORECO) has been financing recycling firms. Exploring the impact of public financing for recycling firms is necessary and important in the utility`s financing management aspect. This study, therefore, concentrated on whether the impact of financed capital on recycling firms` outputs is fruitful or not, and also paid attention to the size and sign of parameters to be estimated