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Swelling of Some Vermiculite-Organic Complexes in Water

Published online by Cambridge University Press:  01 January 2024

W. G. Garrett  and
G. F. Walker
W. G. Garrett
Affiliation:
Chemical Research Laboratories, C.S.I.R.O., Melbourne, Australia
G. F. Walker
Affiliation:
Chemical Research Laboratories, C.S.I.R.O., Melbourne, Australia
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Abstract

Complexes formed by macroscopic vermiculite crystals and n-alkylammonium ions with alkyl chains of 3‐4 carbon atoms swell unidimensionally in water until the silicate layers are several hundred Ångströms apart.

The initiation of swelling is thought to involve the development of “icebergs” of the Frank-Evans type around the alkylammonium ions. Hydration of the oxygen surfaces of the silicate layers may also be a significant factor in the swelling process.

Cataphoresis experiments on finely dispersed aqueous suspensions indicate the presence of diffuse double layers of positive ions around negatively charged silicate particles. Further swelling on applying an electric field to individual swollen crystals immersed in water and dilute solutions also has been observed.

Type
Symposium on Clay—Organic Complexes
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 9 , February 1960 , pp. 557 - 567
Copyright
Copyright © The Clay Minerals Society 1960

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