Navegando por Palavras-chave "Carbon fiber"

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    Growth of vertically aligned carbon nanotubes on carbon fiber: thermal and electrochemical treatments
    (Springer, 2013-07-01) Almeida, D. A. L.; Antunes, E. F. [UNIFESP]; Silva, V. Q. da; Baldan, M. R.; Ferreira, N. G.; INPE; Universidade Federal de São Paulo (UNIFESP)
    Composite electrodes of vertically aligned carbon nanotubes (VACNT) were synthesized on carbon fiber (CF) substrate by pyrolysis of camphor/ferrocene using a SiO2 interlayer as a barrier against metal diffusion into the substrate. Two treatments were used to remove iron from CF/VACNT structure: thermal annealing at high temperature under inert atmosphere and electrochemical oxidation in H2SO4 solution. the composites were characterized by scanning electron microscopy and Raman scattering spectroscopy. Besides, the electrochemical behavior of CF/VACNT was analyzed by cyclic voltammetry and charge/discharge tests. CF/VACNT composite submitted to the electrochemical oxidation showed the best electrochemical performance, with high specific capacitance, which makes it very attractive as electrode for supercapacitors.
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    Production and Characterization of Activated Carbon Fiber from Textile PAN Fiber
    (Inst Aeronautica & Espaco-Iae, 2017) do Amaral Junior, Miguel Angelo; Matsushima, Jorge Tadao; Rezende, Mirabel Cerqueira [UNIFESP]; Goncalves, Emerson Sarmento; Marcuzzo, Jossano Saldanha; Baldan, Mauricio Ribeiro
    This paper presents the preparation and characterization of carbon fiber felt and activated carbon fiber felt from textile polyacrylonitrile fiber. Carbon fibers are usually related to aircraft manufacturing or high mechanical purposes. Activated carbon fibers are known as excellent adsorbent materials. Despite all advantages, carbon fiber and activated carbon fiber are expensive materials because of their raw material cost. On the other hand, in this study, carbon fiber felt and activated carbon fiber felt were produced from textile polyacrylonitrile fiber, which is cheaper than their precursor, polyacrylonitrile fiber, and can be converted into carbon fiber felt and activated material with high micropore content and surface area. This research describes the transformation of textile polyacrylonitrile fiber in its oxidized form. After that, the oxidized material was transformed in felt and, in the sequence, converted into carbon fiber felt and activated carbon felt. The carbon fiber felt and activated carbon fiber felt were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy and scanning electron microscope. N-2 isotherms were performed to qualify the material obtained for further electrochemical applications. The main result was the conversion dynamics of textile polyacrilonitrile fiber into carbon fiber in felt form and activated carbon fiber in felt with high surface area and high micropores content.