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New PDF release: Adsorption by powders and porous solids : principles,

By Françoise Rouquerol; J Rouquerol; K S W Sing

ISBN-10: 0080526012

ISBN-13: 9780080526010

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Additional info for Adsorption by powders and porous solids : principles, methodology, and applications

Example text

20), then it is necessary to find another adsorption potential. For this purpose we must characterize the adsorbed phase by another intensive variable. It is well known that the effect of surface tension is to minimize the area of a liquid surface. From a thermodynamic standpoint, the notion of surface tension can also be applied to a solid surface, although its physical significance is more difficult to explain. For our present purpose, we may adopt an analogous definition of the surface tension of a clean solid adsorbent to that for a clean liquid surface.

47, 3. Gore G. (1894) Phil. , 37, 306. J. W. (1982) Adsorption, Surface Area and Porosity, Academic Press, London. , Rouquerol F. and Rouquerol J. (1979) J. , 70, 239. , Rouquerol J. E. , Rouquerol F. and Rouquerol J. (1989) Thermochim. Acta, 148, 191. ,Tosi-Pellenq N. and Rouquerol J. (1993) In: Proc. Fourth International Conference on Fundamentals of Adsorption (M. ), Kodansha, Tokyo, p. 235. E. (1997) In: Physical Adsorption: Experiment, Theory and Applications (J. C. 65. G. (1915) J. Russ.

7, included the Type VI which has been more recently observed. In its most characteristic form, the Type I isotherm is concave to the relative pressure (p/pO) axis. It rises sharply at low relative pressures and reaches a plateau: the amount adsorbed by the unit mass of solid, na/m s, approaches a limiting value as p/p~ l. 7, enhanced adsorbent-adsorbate interactions occur in micropores of molecular dimensions. A decrease in the micropore width results in both an increase in the adsorption energy and a decrease in the relative pressure at which the micropore filling occurs.

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Adsorption by powders and porous solids : principles, methodology, and applications by Françoise Rouquerol; J Rouquerol; K S W Sing

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