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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 573-580 
    ISSN: 1572-8943
    Keywords: adsorption of water andn-heptane on paper ; BET theory ; compressibility factor ; microcalorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have studied the geometry and energy involved in the interactions between adsorbed molecules and paper substrate, over a wide range of partial pressures. A two-dimensional virial equation of state was employed to evaluate the extent of interactions by the compressibility factor (Z). Data of H-bonded molecules (water and butan-1-ol) and of more weakly interacting ones (n-decane and dioxane) were selected from the literature. At low surface coverage, the compressibility factor Z exceeds 1, showing a deviation from ideality due to interactions, and reaches a maximum at a value close to the BET monolayer. As preliminary results we have measured by means of a differential microcalorimeter (Calvet) at 25
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 627-634 
    ISSN: 1572-8943
    Keywords: adsorption ofn-aliphatic alcohols on alumina ; microcalorimetry ; thermokinetic investigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A differential microcalorimeter (E. Calvet) was used to study the processes of adsorption of five aliphatic alcohols (C1-C5) on α-Al2O3 at 25, 50, 100, 150 and 200°C. In particular, the importance of the thermokinetic study of the chemisorption of such alcohols at different experimental temperatures was demonstrated, with regard to the variations in the thermokinetic parameters (tmax, t1/2 and t0) and the evolution of the alcohol vapor pressure on the adsorbent during the adsorption process. It was concluded that: a) all the heat emission peaks of alcohol adsorption have the same rounded shape at 25°C; b) on passing from methanol to 1-pentanol, the area of the adsorption peaks increases as the chain length or molecular weight increases; c) on passing from 25 to 200°C, the shape of the adsorption peaks becomes more pointed.
    Type of Medium: Electronic Resource
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