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Determination of Surface Areas of Mineral Powders by Adsorption Calorimetry

Published online by Cambridge University Press:  02 April 2024

Kenneth V. Ticknor  and
Preet P. S. Saluja
Kenneth V. Ticknor
Affiliation:
Atomic Energy of Canada Limited, Whiteshell Nuclear Research Establishment, Pinawa, Manitoba R0E 1L0, Canada
Preet P. S. Saluja
Affiliation:
Atomic Energy of Canada Limited, Whiteshell Nuclear Research Establishment, Pinawa, Manitoba R0E 1L0, Canada
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Abstract

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Adsorption calorimetry was used to develop a method for determining the surface area of low-surface-area materials (<1 m2/g), which required no pretreatment of the surface, such as outgassing at elevated temperatures. The method involved flowing heptane through a small amount of sample (0.15 to 1.0 g) in the flow cell of a commercial microcalorimeter. When thermal equilibrium was reached at the powder-heptane interface, pure heptane was replaced with a heptane carrier-solution containing 0.6 volume % n-butanol (n-BuOH) as the preferential adsorbate. The integral enthalpy of preferential saturation adsorption, ΔHsat, of n-BuOH on the surface was found to be a function of the BET surface area of the sample. An empirical relationship between ΔHsat and BET surface area was determined over a surface area range of about three orders of magnitude (0.095 to 81 m2/g) by performing adsorption experiments on five α-alumina standard reference powders. The technique was applied to the determination of surface areas of untreated rock and mineral powders.

Keywords

Adsorption calorimetryα-Aluminan-ButanolFracture-filling mineralsSurface area
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 4 , August 1990 , pp. 437 - 441
Copyright
Copyright © 1990, The Clay Minerals Society

Footnotes

1

Issued as Atomic Energy of Canada Limited publication, AECL-9925.

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