Adsorption hysteresis in porous materials
Adsorption hysteresis exhibits a wide range of phenomena dependent on the nature of both the adsorbent and the adsorptive, and on the tenperature. some of these features are described and an outline is given of their interpretation in terms of the physical processes involved. Particular attention is paid to the changes in the size and shape of hysteresis loops brought about by changes in tenperature, which are discussed in terms of hysteresis phase diagram . Hysteresis critical temperatures' are identified and linked to recent theories of capillary condensation.