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- W2071646611 abstract "Abstract The helium densities of polymer carbons prepared at 700°C vary with the temperature of measurement. For some carbons prepared at 700°C the density measured at 300°C was lower than that measured at room temperature, as was found by Maggs and his co-workers. For other 700°C carbons this temperature effect was reversed. For carbons heated to 2700°C, the difference is negligible, and except for measurements of the highest accuracy it seems satisfactory to measure the helium densities of 2700°C carbons at room temperature. A cellulose carbon prepared at 1500°C shows a very marked reversal of the effect found by Maggs et al. This could be due to several factors including activated diffusion into very narrow pores. Helium which has penetrated at 300°C pores in this carbon that were closed at room temperature can be trapped there by cooling the carbon to room temperature; release is effected by reheating to 300°C." @default.
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- W2071646611 date "1966-05-01" @default.
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- W2071646611 title "The helium densities of some polymer carbons" @default.
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