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Application of programmed thermodesorption of the liquid under quasi-isothermal conditions to investigate physicochemical properties of liquid layers and solid surfaces

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Abstract

This paper presents the results of measurements of the programmed thermodesorption of polar and nonpolar liquids from the surface of different types of solids. The course of thermodesoption was found to depend on the properties of the solid and the wetting liquid. Thermodesorption occurred not exponentially but in steps, which reflects the noncontinuous changes in the properties of the surface layer with the distance from the solid surface. This effect intensified with the increase in polarity of the wetting liquid and the heterogeneity of the solid surface. The earlier investigations showed that application of the method of differential thermal analysis allowed determination of the distribution of the adsorption potential of the liquid on the solid surface.

Zusammenfassung

Diese Arbeit legt die Meßergebnisse von gesteuerter Thermodesorption polarer und unpolarer Flüssigkeiten an verschiedenartigen Feststoffen dar. Man fand, daß der Weg der Thermodesorption von Feststoff und Benetzungsflüssigkeit abhängt. Die Thermodesorption erfolgt nicht exponentiell, jedoch in Schritten, welche unkontinuierliche Veränderungen in den Eigenschaften der Oberflächenschicht in Abhängigkeit vom Abstand von der Feststoffoberfläche zeigen. Dieser Effekt nimmt mit steigender Polarität der Benetzungsflüssigkeit und mit steigender Heterogenität der Feststoffoberfläche zu. Frühere Untersuchungen zeigten, daß die Anwendung von DTA die Bestimmung der Verteilung der Adsorptionspotentiale der Flüssigkeit auf der Feststoffoberfläche ermöglicht.

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The author is indebted to Prof. M. Jaroniec for very fruitful discussions and to Prof. J. Choma for the activated carbon samples.

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Staszczuk, P. Application of programmed thermodesorption of the liquid under quasi-isothermal conditions to investigate physicochemical properties of liquid layers and solid surfaces. Journal of Thermal Analysis 38, 2325–2334 (1992). https://doi.org/10.1007/BF02123985

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  • DOI: https://doi.org/10.1007/BF02123985

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