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A novel silicon-containing carbon precursor was synthesised by reacting a petroleum pitch fraction and polydimethysilane. The precursor containing about 26 wt% Si was melt spun into fibres and then oxidatively cured in air to render the fibres infusible. The cured fibres were pyrolysed at 1200°C under inert atmosphere to produce carbon-silicon alloy (CSA) fibres. The oxidation behaviour is improved...
Recent literature is reviewed concerning the influence of suspension pH and ion concentrations on the zeta-potential of near-stoichiometric BaTiO 3 powders. New work is reported concerning the surface chemistry and rheology of BaTiO 3 powder in aqueous phase suspensions prepared without the use of surfactants or polyelectrolytes.
The rheology of mesophase-pitches, having different percentage mesophase content, has been investigated by means of controlled stress, oscillatory rheometry. Three thermally transformed mesophase-pitches (prepared from Ashland A240), with mesophase contents in the range 60-95%, together with a 100% optically anisotropic synthetic mesophase-pitch from Mitsubishi Gas-Chemical Company were studied....
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