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Continuous carbon nanotube sheets spun from the side of vertically aligned forests were investigated as solar selective coatings in evacuated tube collectors for solar thermal applications and for Joule heating in the absence of solar radiation. Forests grown by chemical vapor deposition at various synthesis temperatures produced sheets with tunable thermal and optical properties. The sheets were...
A new non-porous carbon material from granular olive stones has been prepared to be used as a reference material for the characterization of the pore structure of activated carbons. The high precision adsorption isotherms of nitrogen at 77.4K and argon at 87.3K on the newly developed sample have been measured, providing the standard data for a more accurate comparative analysis to characterize disordered...
A series of binderless activated carbon monoliths (ACMs) have been prepared from petroleum pitch and using KOH as activating agent. Characterization shows that these activated carbons combine a large “apparent” surface area (up to S BET ∼3000m 2 /g) together with a well-developed narrow micropore size distribution. Dynamic column adsorption experiments using different volatile organic...
This study is focused on the effect of the porosity and chemical reactivity with silicon of the carbon preforms on the properties of SiC pieces produced by reactive infiltration. Petroleum residues were selected as carbon precursor because of their unique combination of properties. On the one hand, semicoke powders with optimum self-sinterability can be obtained from them to develop a wide range of...
Activated carbon binderless monoliths with high consistency and large porosity, synthesised from a mesophase pitch, are studied as electrodes for supercapacitors. The electrochemical cells prepared provided high capacitance values in sulphuric acid media (334Fg −1 ) and very low electrical resistivity, which results in a very efficient energy storage device (12WhKg −1 maximum energy...
The experimental conditions for the pyrolysis of olive stones to produce a swelling of the particle and eventually the formation of carbon foam are described and discussed. The greatest expansion of the material occurred when 200–300g of precursor, in the presence of steam at a pressure of 1MPa, is introduced into a 1000ml stainless steel reactor placed inside a sand-bath furnace previously heated...
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