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Application of Inverse Gas Chromatography to the Study of the Surface Properties of Slates

Published online by Cambridge University Press:  28 February 2024

M. A. Rodriguez
Affiliation:
Dpto. Cristalografía y Mineralogía, F. Ciencias Universidad Extremadura, Badajoz, Spain
J. Rubio
Affiliation:
Instituto de Cerámica y Vidrio, C.S.I.C., Arganda del Rey, 28500 Madrid, Spain
F. Rubio
Affiliation:
Instituto de Cerámica y Vidrio, C.S.I.C., Arganda del Rey, 28500 Madrid, Spain
M. J. Liso
Affiliation:
Dpto. Cristalografía y Mineralogía, F. Ciencias Universidad Extremadura, Badajoz, Spain
J. L. Oteo
Affiliation:
Instituto de Cerámica y Vidrio, C.S.I.C., Arganda del Rey, 28500 Madrid, Spain
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Abstract

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Inverse gas chromatography (IGC) at zero surface coverage was used for determining the surface characteristics of a slate sample. Previously this sample had been characterized by means of X-ray diffraction (XRD), chemical analysis, infrared (IR) spectroscopy and nitrogen adsorption. Quartz, muscovite and chlorite were the minerals foming the slate. A well-defined mesoporous structure with pores of 15 Å of interlayer distance was observed. Chemical analysis and IR spectroscopy corroborated the X-ray results. The surface characteristics of the slate were defined in relation to nonspecific and specific interactions with organic molecules. In accordance with the nonspecific interactions, the London component (γSD) of the surface free energy gave an estimation of the surface energy of the slate sample. The obtained values for γSD were 140.0, 124.8, 108.2 and 96.8 mN m-1 at 100, 110, 120 and 130 °C, respectively. These values were characteristic of an inorganic sample of high surface energy. The values of the thermodynamic variables—differential heat of adsorption, free energy and entropy of adsorption—were in accordance with these results. At the same time, specific interactions were characterized by the ηπ parameter and the acid-base (KA, KB) indices. The positive value of ηπ (0.09 kJ mol-1) indicated the presence of Lewis acidic sites on the slate surface. The value of KA (acid index) of 1.17 was higher than the value of KB (base index) of 0.37; this result confirmed the acidic nature of the studied slate's surface.

Type
Research Article
Copyright
Copyright © 1997, The Clay Minerals Society

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