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The Ordering of Cetylpyridinium Bromide on Vermiculite

Published online by Cambridge University Press:  01 July 2024

P. G. Slade ,
M. Raupach  and
W. W. Emerson
P. G. Slade
Affiliation:
Division of Soils, C.S.I.R.O., Adelaide, Australia
M. Raupach
Affiliation:
Division of Soils, C.S.I.R.O., Adelaide, Australia
W. W. Emerson
Affiliation:
Division of Soils, C.S.I.R.O., Adelaide, Australia
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Abstract

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X-ray superlattice reflections, infrared spectroscopy, and chemical analyses have established that cetylpyridinium bromide (CPB) is highly ordered when adsorbed on vermiculite. The molecules, which stand at about 57° to the silicate surface, form close-packed arrays. Full surface coverage is achieved only for the most highly charged vermiculites. The packing within the arrays accounted for the superlattice observed and each adsorbed molecule had an area of 18.4 Å2 at the surface. The implications of these findings for the CPB method used in soil surface area studies are discussed.

Резюме

Резюме

Рентгеновские сверхрешетчатые отражения, инфракрасная спектроскопия и химические анализы показали, что цетилпиридиновый бромид /ЦПБ/ в высшей степени упорядочен, когда адсорбирован вермикулитом. Молекулы, которые расположены под углом около 57° к поверхности силиката, образуют тесно упакованные системы. Покрытие всей поверхности достигается только для вермикулитов с наиболее высокими зарядами. Наблюдалась упаковка в пределах систем, обуслов ленная свехрешеткой, и было установлено, что каждая адсорбированная молекула имеет на поверхности площадь 18,4 Å2. Обсуждаются возможности использования этих выводов для изучения поверхности почвы методом ЦПБ.

Kurzreferat

Kurzreferat

Röntgenüberstrukturreflektionen, Infrarotspektroskopie und chemische Analyse haben bewiesen, daß Cetylpyridiniumbromid (CPB) in hohem Grade geordnet ist, wenn es an Kieselgur adsorbiert ist. Die Moleküle, welche sich in einem etwa 57° Winkel zu der Silikatoberfläche befinden, formen kompakte Anordnungen. Nur die am höchst geladenen Kieselgure bedecken die ganze Oberfläche des Silikates. Das Aufschichten innerhalb der Anordnungen erklärt die Überstruktur, welche gesehen wurde. Jedes Molekül maß 18,4 A2 an der Oberfläche. Die Bedeutung dieser Befunde für die CPB-Methode, welche in Untersuchungen von Erdoberflächen benutzt wird, ist diskutiert.

Keywords

AdsorptionCetylpyridiniumExchangeInterlayerSuperlatticeVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 26 , Issue 2 , April 1978 , pp. 125 - 134
Copyright
Copyright © 1978, The Clay Minerals Society

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