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GeoRef Categories
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The Queen Charlotte Islands refraction project. Part II. Structural model for transition from Pacific plate to North American plate: Discussion Free
Gravity and magnetic signatures of the Ackley Granite Suite, southeastern Newfoundland: implications for magma emplacement Free
Geophysical interpretation of the geology of the northeast Gander Terrane, Newfoundland Free
A geophysical interpretation of the onshore and offshore geology of the southern Avalon Terrane, Newfoundland Free
Offshore extensions of the Avalon Zone of Newfoundland Free
Rapid Determination of Surface Areas of Mineral Powders Using Adsorption Calorimetry Available to Purchase
Abstract Adsorption-desorption calorimetry (ADCAL) was used to determine surface areas of 10 mineral powders, including 4 clay minerals, and carbon black. The method involved flowing a carrier liquid (pure heptane) through a small amount (< 0.4 g) of sample in the sorption cell of a commercial microcalorimeter. When thermal equilibrium was established, pure heptane was replaced by a heptane solution containing n-butanol (n-BuOH) as an adsorbate. The maximum integral enthalpy of adsorption of n-BuOH on the surface was assumed to be proportional to the surface area of the sample. The empirical proportionality constant was determined using a reference sample (SiO 2 or kaolinite (KGa-l)) of known BET surface area. Well-characterized powders of TiO 2 (anatase) and very poorly crystalline SiO 2 , ZnO, and carbon black of known BET specific surface areas ranging from 24.3 to 0.64 m 2 /g were used as standards to determine the internal consistency of the method. A precision of ±4% was obtained; the specific surface areas determined by ADCAL were within ± 5% of the BET values. The method was applied to three nonex-panding clay minerals (a well crystallized (KGa-l) and a poorly crystallized (KGa-2) kaolinite and pal-ygorskite (PF1–1)), one expanding clay mineral (Wyoming montmorillonite (SWy-1)), and two minerals with low specific surface areas ( < 0.5 m 2 /g), olivine and microcline. Except for the expanding clay and the very low surface area microcline, the specific surface areas determined by ADCAL were within ± 4% of the BET values. The advantages of this method are that it is fast ( < 2 hr/sample), only a small amount of sample is required ( < 0.4 g), and it can be conducted at room temperature.