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Surface fractal dimensions of some industrial minerals from gas-phase adsorption isotherms

Published online by Cambridge University Press:  31 January 2011

Yves Lefebvre ,
Serge Lacelle  and
Carmel Jolicoeur
Yves Lefebvre
Affiliation:
Laboratoire de réactivité de surface et structure, Université Pierre et Marie Curie–Paris VI, Tour 54-55, 2e étage, 75014 Paris, France
Serge Lacelle
Affiliation:
Département de chimie, Université de Sherbrooke, Sherbrooke (Québec), Canada J1K 2R1
Carmel Jolicoeur*
Affiliation:
Département de chimie, Université de Sherbrooke, Sherbrooke (Québec), Canada J1K 2R1
*
a)Address correspondence to this author.
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Abstract

A high precision gravimetric method was used to investigate the adsorption of nitrogen (N2) and carbon tetrachloride (CCl4), respectively, at 77 and 298 K, onto various industrial minerals. The solids investigated include silica isomorphs, blast furnace slags, an Y-zeolite, and several naturally occurring fibrous minerals. The adsorption isotherms were analyzed to derive surface areas, BET constants (C), and surface fractal parameters (D). The latter were obtained through an approach recently suggested by Avnir and Jaroniec,1 using multilayer adsorption data; D values obtained for the various gas-solid systems investigated cover the range 2.1–3.0. A systematic comparison between D values inferred from N2 and CCl4 adsorption data shows that the CCl4 molecule probes the surface roughness in a more discriminate fashion than N2. In most cases, the differences between D(N2) and D(CCl4) appear to reflect changes due to sample preparation more than intrinsic differences amongst the various solids.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1888 - 1891
Copyright
Copyright © Materials Research Society 1992

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