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Characteristics of fine pores in some halloysites

Published online by Cambridge University Press:  09 July 2018

G. J. Churchman ,
T. J. Davy ,
L. A. G. Aylmore ,
R. J. Gilkes  and
P. G. Self
G. J. Churchman
Affiliation:
CSIRO Division of Soils, Glen Osmond, South Australia
T. J. Davy
Affiliation:
Soil Science and Plant Nutrition, Faculty of Agriculture, The University of Western Australia, Nedlands, Western Australia
L. A. G. Aylmore
Affiliation:
Soil Science and Plant Nutrition, Faculty of Agriculture, The University of Western Australia, Nedlands, Western Australia
R. J. Gilkes
Affiliation:
Soil Science and Plant Nutrition, Faculty of Agriculture, The University of Western Australia, Nedlands, Western Australia
P. G. Self
Affiliation:
CSIRO Division of Soils, Glen Osmond, South Australia
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Abstract

Isotherms were obtained for nitrogen adsorption and desorption on seven halloysite-rich samples from New Zealand and Western Australia. Calculations from these isotherms indicate that halloysites with mainly small particles (< c. 0.08 μm in width) had abundant cylindrical pores with narrow size distributions in the 5-15 nm range. They also indicate that halloysites with mainly large particles (> c. 0.1 μm in width) had few if any pores in the mesopore range (2–50 nm). Transmission electron microscopy (TEM) shows that cylindrical pores originate from the central holes in tubular particles. The TEM also suggests that slit-shaped pores can originate from the shrinkage of blocks of layers upon dehydration of halloysite.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 2 , June 1995 , pp. 89 - 98
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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