Hysteresis associated with capillary condensation and
evaporation in porous materials has been the subject of immense
interest for over 100 years [1], especially the search for the
controlling mechanisms of adsorption and desorption.
Adsorption in mesopores gives rise to hysteresis when the
temperature is less than the critical hysteresis temperature and
pore size is greater than a critical value.
Materials such as activated carbon, porous glass and silica
gelconsist of interconnected networks of pores of various shape
and size ,Their experimental isotherms can exhibit single or double
steps in the hysteresis loop. When hysteresis shows two
distinct steps, the first, at lower pressure, is associated with
condensation and evaporation in the smaller pores and
the second with the same processes in wider pores.
Both trials, which found that While the cavity size affects the
cavitation pressure for small cavities and the neck
dimensions (width and length) affect the governing
mechanism for desorption, temperature can also affect the
desorption mechanism, which changes from pore blocking
to cavitation at high temperature, because stretching of the
condensed fluid in the cavity. The temperature dependence
of the condensation and evaporation pressures, From all
observations at lower temperature will Adsorption is very well
than at higher temperature
Despite numerous simulation studies, there is still no
systematic investigation into the effects of pore dimensions,
temperature and adsorbate on the switch in the mechanism of
desorption, from pore blocking to cavitation, in ink-bottle pores.
It is the objective of this paper to fill this gap.