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Ozone treatment of isotropic-pitch-based carbon fiber was found to increase the surface oxygen concentration and change surface oxygen from C-O to C O, thereby causing the contact angle between fiber and water to be decreased to zero. Thus, the bond strength between fiber and cement paste was increased and the tensile strength, modulus and ductility of carbon fiber reinforced cement paste were increased...
Hairy carbons were prepared by catalytic growth of carbon hairs (diameter 0.05-0.2 μm, at least partly crystalline) on carbon black, graphite particle and carbon fiber substrates. Of the substrates used, the most abundant hair growth was achieved using carbon black, due to the confinement of the catalyst size by the pores in the carbon black. The cyclic voltammetric response of all hairy carbons...
A carbon-carbon composite was found to be able to sense its own damage and dynamic strain, as its electrical resistance increased irreversibly upon damage and increased reversibly upon tensile strain. Even damage after the first cycle of tensile loading within the elastic regime was detected. The reversible resistance increase upon cyclic tension was mainly due to dimensional changes, but it was...
The electrochemical behavior of porous carbons based on carbon fibers and those based on phenolic was evaluated by cyclic voltammetry via the Fe 2+ /Fe 3+ redox couple. An irreversible electrochemical response obtained from the fiber-based porous carbons was made reversible by coating of the porous carbons with graphite flakes or carbon black; the electron-transfer rate...
Oxidation changed the electrochemical behavior of carbon black, catalytically grown carbon filaments and pitch-based carbon fibers from irreversible to reversible, as shown by cyclic voltammetry using the Fe(CN) -3-46 redox couple. Thermal oxidation of carbon black (16%) yielded a higher electron transfer rate constant k s than did chemical (HCl or HNO 3 ...
The incorporation of 0.1-0.2 μm diameter carbon filaments (0.6 vol.%) between continuous carbon fiber (7 μm diameter, 56.5 vol.%) layers in an epoxy-matrix composite during composite fabrication was found under flexure to greatly increase transverse and longitudinal tan δ values, increase the storage modulus in the transverse direction, slightly decrease the storage modulus in the longitudinal direction,...
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