Thermodynamic properties of confined fluids I: experimental measurements of krypton adsorbed by mesoporous silica from 80K to 130K

摘要

Adsorption and desorption isotherms of krypton on a mesoporous silica, MCM-41, were measured at twelve temperatures in the range from 80 K to 130 K using a newly designed cryostat. The isosteric heats of adsorption and desorption were calculated as a function of loading from the slopes of the interpolated adsorption and desorption isosteres. The isosteres in the pore filling regime showed no indication of a phase transition from fluid to solid in the experimental temperature range. The critical temperature for hysteresis was calculated to be 136.4 K.