Heat capacity behaviour of pore confined benzene and hexafluorobenzene in NaY zeolite
Literature Information
Guohua Zhao, Barara Groß, Herbert Dilger, Emil Roduner
The heat capacities of benzene, hexafluorobenzene and of its 1 : 1 binary mixture adsorbed on NaY zeolite were measured as a function of temperature for 120 K ≤ T ≤ 370 K. They reveal strong loading dependencies and reach extraordinarily high values at intermediate loadings. They are indicative of an energy gap above the ground state or of a state in which soft anharmonic intermolecular modes of the dilute adsorbate are excited. The absence of any phase transitions over a large temperature and coverage range resembles supercritical behaviour, as was predicted in recent theoretical work. At a certain loading, small heat capacity fluctuations reveal subtle structural instabilities which are possibly related to the formation and break-up of aggregates, phenomena which are also expected for matter near the critical point.
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