Hysteresis Thermodynamics of Capillary Condensation in Mesopores

✍ Scribed by Vladimir Yu. Gusev

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 123 KB
• Volume: 194
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5077

✦ Synopsis

NOTE Hysteresis Thermodynamics of Capillary Condensation in Mesopores

macroscopic dependencies determined in the capillary experiment in terms of interfacial phenomenological relations. A useful insight on the molecular A thermodynamic approach based on mass, energy, and endetails of the capillary condensation hysteresis in the independent model tropy balances is developed for capillary condensation hysterepores is gained by means of molecular theory and computer simulation sis in porous media. Processes of fluid condensation and evapotechniques (10-12).

ration are considered as quasi-isothermal irreversible transitions

The method presented below stems from the thermodynamic approach between equilibrium states of the capillary system. The corredue to Hu ¨ckel (13), further developed for the description of adsorption sponding balances express the equilibrium interfacial properties and capillary condensation processes (14, 15) and of nonwetting liquid of the system through the work and heat measured in capillary intrusion and extrusion processes ( ) in capillary porous media. It is based process and, thus, may be used for evaluating the vapor-conupon the balance of the work performed on the system and the correspondent densed phase interface area as a function of pressure, surface free energy change and allows the surface area of the adsorbed film to be area of the porous solid, its pore size distribution, and surface determined as a function of pressure. Having this function, the surface area fractal properties. ᭧ 1997 Academic Press of the porous solid (14, 15), its pore size distribution (17), surface fractal