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Surface Properties and Texture of Chrysotiles

Published online by Cambridge University Press:  01 July 2024

J. J. Fripiat  and
M. della Faille
J. J. Fripiat*
Affiliation:
Laboratoire de Physico-Chimie Minérale, Institut Agronomique, Université de Louvain, Heverlee-Louvain (Belgium)
M. della Faille*
Affiliation:
Laboratoire de Physico-Chimie Minérale, Institut Agronomique, Université de Louvain, Heverlee-Louvain (Belgium)
*
*The University of Louvain and M.R.A.C., Tervuren (Belgium).
†Eternit S.A., Kapelle-op-den-Bos (Belgium).
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Abstract

Nitrogen surface areas and pore-size distribution curves of various chrysotiles have been measured using a continuous flow method. A model founded on a hexagonal close packing of fibers has been adjusted to fit the frequency distribution curve of the fiber outside diameters obtained from electron micrographs. From this model, theoretical distribution functions of the surface area versus the pore diameter were computed and compared to the experimental data. For one fiber only (i.e. Coalinga chrysotile), the good agreement between the computed and experimental data allows one to conclude that the external pores (between the fibers) and the internal pores (within the fibers) are free from any amorphous material. For the other studied chrysotiles, the degree of filling of the pore system by amorphous materials was always higher than 50%. Under these conditions, hydration water cannot be removed unless the samples are pretreated in the 300°–400°C temperature range. On the contrary, water is driven off from the “clean” Coalinga fibers at temperatures lower than 100°C. Surface area measurements derived from water-adsorption isotherms correspond to those obtained with nitrogen after the hydration water has been removed.

Type
General
Information
Clays and Clay Minerals , Volume 15 , February 1967 , pp. 305 - 320
Copyright
Copyright © 1967, Springer International Publishing

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