Abstract
The heat of immersional wetting of charcoal by methanol has been calculated from adsorption and immersional expansion data. Satisfactory agreement was found between measured and calculated heats of wetting of 13 different charcoals even when the swelling is anisotropic. The results substantially support the theory of Bangham and Razouk that the expansion of charcoal on immersion in a liquid is proportional to the surface free energy decrement of the charcoal accompanying its immersion. Heats of immersion of 17 charcoals were measured, and the specific surface areas were determined from the absorption isotherms of methanol and of nitrogen. the enthalpy of immersion per unit area was found to vary between 159 and 233 ergs/cm 2, whereas the free energy of immersion calculated from swelling data varied between 86 and 117 ergs/cm 2. The latter values differed very little from the spreading film pressures near saturation.
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