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Specific surface area and pore structure of allophanic soil clays

Published online by Cambridge University Press:  09 July 2018

E. Paterson
E. Paterson*
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
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Abstract

Low temperature nitrogen adsorption has been used to study the external and internal structure of a number of allophanic soil clays. The results indicate that allophane, in addition to having pores in the intermediate size range (2–10 nm radius), contains micropores of < 1 nm radius. The occurrence of hitherto unreported micropores in allophanic clays has necessitated re-evaluation of the validity of specific surface area measurements.

Sommaire

Sommaire

La prise de nitrogène à basse température a été utilisée pour étudier la structure externe et interne de plusieurs argiles de sol allophanique. Les résultats indiquent que, outre la présence de pores dans la gamme des dimensions intermédiaires (rayon de 2–10 nm), l'allophane contient des micropores de rayon de < 1 nm. La venue de micropores non mentionnés jusqu'ici dans les argiles allophaniques a nécessité une réévaluation de la validité des dimensions de zones de surfaces spécifiques.

Kurzreferat

Kurzreferat

Bei der Erforschung der externen und internen Struktur verschiedener Arten von Allophanton wurde von Niedertemperatur-Stickstoffadsorption Gebrauch gemacht. Es hat sich herausgestellt, daß Allophan zusätzlich zu Poren mittlerer Größe (2–10 nm Radius) Mikroporen von < 1 nm Radius enthält. Das Auftreten von Mikroporen bei Allophanton, über das keine früheren Berichte vorliegen, hat es erforderlich gemacht, die Gültigkeit spezifischer Oberflächenmaße zu überprüfen.

Resumen

Resumen

Se ha empleado la técnica de adsorción de nitrégeno a baja temperatura para estudiar la estructura externa e interna de varias arcillas alofánicas. Los resultados indican que la alófana, además de tener poros en la gama de tamaños intermedios (2–10 nm de radio), contiene microporos de < 1 nm de radio. EI descubrimiento de microporos no puestos de manifiesto hasta ahora en las arcillas alofáinicas ha hecho necesario reevaluar la validez de las mediciones de superficie especifica.

Type
Research Article
Information
Clay Minerals , Volume 12 , Issue 1 , March 1977 , pp. 1 - 9
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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