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Vermiculite as A Model System in the Testing of Double Layer Theory

Published online by Cambridge University Press:  01 July 2024

John P. Friend  and
Robert J. Hunter
John P. Friend
Affiliation:
Department of Physical Chemistry, University of Sydney, N.S.W., 2006, Australia
Robert J. Hunter
Affiliation:
Department of Physical Chemistry, University of Sydney, N.S.W., 2006, Australia
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Abstract

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The microelectrophoretic and adsorption behaviour of lithium vermiculite has been studied as a function of lithium chloride concentration. This was done in an attempt to establish the applicability of such systems to the testing of theories of interaction of flat plates, and in so doing to throw further light on swelling measurements performed on such materials. The studied behaviour, while highly unusual, gave quite good agreement between adsorption and microelectrophoretic parameters and agreed, qualitatively, with some earlier measurements on similar materials.

The observed properties appear to be due to some rather specific structuring effects, either of the oxide surface or of the electrolyte ions. If this is so, these systems are far from ideal models for the testing of the theory of interaction of two uniform flat plates.

Résumé

Résumé

Le comportement microélectrophorétique et d’absorption de la vermiculite de lithium a été étudié en tant que fonction de la concentration du chlorure de lithium. Ceci a été effectué au cours d’une tentative visant à établir l’applicabilité de tels systèmes à l’essai des théories d’interaction de plaques planes et, se faisant, de jeter une plus grande lumière sur les mesures de gonflement effectuées sur ces matériaux. Le comportement étudié, bien que très inhabituel, donnait un accord assez satisfaisant entre les paramètres microélectrophorétique et d’absorption et s’accordait, qualitativement, avec certaines mesures antérieures sur des matériaux similaires.

Les propriétés observées semblent être dues à certains effets spécifiques de structure, soit de la surface oxyde ou des ions de l’électrolyte. Si cela est, ces systèmes sont loin d’être des modèles idéaux pour l’essai de la théorie d’interaction de deux plaques planes uniformes.

Kurzreferat

Kurzreferat

Das mikroelektrophoretische und Adsorptions verhalten von Lithiumvermiculit in Abhängigkeit von der Lithiumchloridkonzentration wurde untersucht. Das geschah im Rahmen eines Versuches die Anwendbarkeit solcher Systeme auf did Prüfung von Theorien über die gegenseitige Wirkung flacher Platten festzustellen, und auf diese Weise mehr Licht auf die an solchen Stoffen ausgeführten Messungen der Aufquellung zu werfen. Das untersuchte Verhalten war wohl ungewöhnlich, zeigte jedoch gute Übereinstimmung zwischen Adsorptions- und mikroelektrophoretischen Parametern und stimmte, qualitativ, mit früheren Messungen an ähnlichen Stoffen überein.

Die beobachteten Eigenschaften scheinen die Folge gewisser struktureller Wirkungen entweder der Oxydoberfläche oder des Elektrolytions zu sein. Sollte das der Fall sein, so sind diese Systeme alles eher als ideale Modelle für die Prüfung der Theorie über die gegenseitige Wirkung zweier gleichförmiger flacher Platten.

Резюме

Резюме

Проведено изучение микроэлектрофоретических и адсорбционных свойств литиевого вермикулита в зависимости от концентрации хлорида лития. Исследование предпринято с целью выяснения возможности использования таких систем для проверки теории взаимодействия плоских пластин и для более правильного истолкования набухания подобных материалов. Изученные свойства хотя и являются весьма необычными, но все же позволяют говорить о хорошем соответствии адсорбционных и микроэлектрофоретических параметров; качественно они согласуются с результатами некоторых ранних исследований аналогичных материалов.

Изученные свойства, по-видимому, обусловлены в первую очередь специфическими структурными эффектами, свойственными как окисным поверхностям, так и электролитическим ионам. Если это действительно так, то подобные системы являются далеко не идеальными моделями для проверки теории взаимодействия двух одинаковых плоских пластин.

Type
Research Article
Information
Clays and Clay Minerals , Volume 18 , Issue 5 , December 1970 , pp. 275 - 283
Copyright
Copyright © 1970 The Clay Minerals Society

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