Abstract
Precise isotherms and calorimetric heats of adsorption have been determined for argon adsorbed on a sample of porous Vycor glass containing one monolayer of preadsorbed frozen water and on the sample containing sufficient water to form a triple layer. Pore size distributions were calculated from the isotherms for these two systems as well as for the bare porous glass adsorbent. Hysteresis effects were observed in the calorimetric heats of adsorption and desorption; these are compared with hysteresis in the isotherms, and in the Clausius—Clapeyron heats. The data indicate that most of the first increment of preadsorbed water is located in micropores and pore necks, but that pore filling occurs when three statistical layers of water are adsorbed.
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