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Comparison of the adsorption properties of krypton on multi-walled carbon nanotubes and on graphite.

Published online by Cambridge University Press:  15 March 2011

Abdelhafid Bougrine ,
Karine Varlot ,
Nicole Dupont-Pavlovsky ,
Jaafar Ghanbaja ,
Denis Billaud  and
François Béuin
Abdelhafid Bougrine
Affiliation:
Laboratoire de Chimie du Solide Minéral, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France
Karine Varlot
Affiliation:
Laboratoire de Chimie du Solide Minéral, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France
Nicole Dupont-Pavlovsky
Affiliation:
Laboratoire de Chimie du Solide Minéral, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France
Jaafar Ghanbaja
Affiliation:
Laboratoire de Chimie du Solide Minéral, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France
Denis Billaud
Affiliation:
Laboratoire de Chimie du Solide Minéral, Université Henri Poincaré-Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France
François Béuin
Affiliation:
Centre de Recherches sur la Matiére Divisée, 1B, rue de la Férollerie, 45071 Orléans cedex 2, France
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Abstract

Krypton adsorption has been investigated on multi-walled carbon nanotubes prepared by catalytic decomposition of acetylene. Isotherms measured between 77.5 and 83.7K from the first stages of adsorption to the adsorbate saturation vapor pressure are compared to those obtained in the same conditions on graphite. The results are discussed in the light of the nanotube morphology, as determined by transmission electron microscopy.

Krypton adsorption proceeds, as on graphite, by successive monomolecular layer condensations on a same surface. From the morphology of the tubes, adsorption probably occurs only on their external surfaces. The first adsorbed layer is commensurate with the substrate. At its completion, it undergoes a transition into an incommensurate solid of higher density. The curvature of the graphene sheets, with respect to those of graphite, produces a stabilization of the commensurate film. The isosteric heat of adsorption Qst was measured to be 11.6 kJ/mol (ΔQst/Qst = 6%) and is lower than that of krypton on graphite.

Moreover, the monolayer condensation pressures are higher than those observed with graphite, which probably leads to an incomplete wetting of the surface by limiting the number of krypton monomolecular layers adsorbed before its bulk condensation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 633: Symposium A – Nanotubes and Related Materials , 2000 , A14.7
Copyright
Copyright © Materials Research Society 2001

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