Ultramicropores in microporous carbon fibres evidenced by helium adsorption at 4.2 K

1 January 1991

journal article
research article
Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions

Vol. 87 (12) , 1915-1916
https://doi.org/10.1039/ft9918701915

Abstract

The adsorption isotherms of He on activated carbon fibres at 4.2 K have been determined gravimetrically. The He adsorption isotherms were of typical type I and were analysed by the Dubinin–Radushkevich plots, giving the micropore volumes which are greater than those obtained from the N₂ adsorption isotherm at 77 K by 20–50%. The excess amount of He adsorption was ascribed to the presence of ultramicropores which cannot be assessed by N₂ molecules.

Keywords

CARBON FIBRE