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Determination of Surface Free Energy of Kaolinite

Published online by Cambridge University Press:  02 April 2024

Emil Chibowski  and
Piotr Staszczuk
Emil Chibowski
Affiliation:
Department of Physical Chemistry, Institute of Chemistry, Maria Curie-Skłodowska University, M. Curie-Słodowska Sq. 3, 20-031 Lublin, Poland
Piotr Staszczuk
Affiliation:
Department of Physical Chemistry, Institute of Chemistry, Maria Curie-Skłodowska University, M. Curie-Słodowska Sq. 3, 20-031 Lublin, Poland
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Abstract

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The adsorption of n-octane and water vapor on natural kaolinite was measured. From adsorption isotherms film pressures were determined which were then used to calculate the dispersion and nondispersion components of the kaolinite surface free energy. In addition, thermodesorption of water from the kaolinite surface was determined. These results suggest that physically adsorbed water remained on the kaolinite surface, even at temperatures as great as 125°C. Therefore, experimentally determined dispersion and nondispersion components appear to relate to the surface precovered with a film of water. These values are: γSf(w)d = 34.4 mJ/m2 for dispersion interactions and γSf(w)n = 60.2 mJ/m2 for nondispersion interactions. Assuming a kaolinite surface precovered with a film of water, which decreased the free energy by the work of spreading, the following components of the energy for the bare surface were calculated: γSd = 67.6 mJ/m2 and γSn = 103.4 mJ/m2, for dispersion and nondispersion components, respectively.

Zmierzono adsorpcję pary wodnej i n-oktanu na naturalnym kaolinicie. Z uzyskanych izoterm adsorpcji wyznaczono ciśnienia filmów i następnie składową dyspersyjną i niedyspersyjną swobodnej energii powierzchniowej kaolinitu. Prócz tego, zbadano także termodesorpcję wody z powierzchni kaolinitu. Z tych doświadczeń wynika, że woda zaadsorbowana fizycznie pozostaje na powierzchni kaolinitu nawet do 125°C. Dlatego, sugeruje się, że wyznaczona doświadczalnie składowa dyspersyjna i niedyspersyjna dotyczy powierzchni pokrytej filmem wody. Wyznaczone wartości wynoszą: γsf(w)d = 34.4 mj/m2 dla oddziaływań dyspersyjnych i γsf(w)n = 60.2 mJ/m2 dla oddziaływań niedyspersyjnych. Przyjmując model, w którym film wody na powierzchni kaolinitu obniża jego swobodną energię o pracę rozpływania, wyliczono składowe tej energii dla czystej powierzchni kaolinitu. Składowe te wynoszą: γsd = 67.6 mj/m2 i γsd = 103.4 mj/m2.

Keywords

AdsorptionFilm pressureFree energyKaoliniten-OctaneSurfaceWater
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 5 , October 1988 , pp. 455 - 461
Copyright
Copyright © 1988, The Clay Minerals Society

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