Comparison of sorptometric and thermoporometric measurements on porous glass and some others

The results of surface structure investigations involving the use of thermo porometry and gas-sorptometry on porous glass, silica and a zeolite were co mpared. The most frequent and the mean pore width were found to be in accor dance, but major differences in specific surface were observed. These two m easuring methods complement each other, because with gas adsorption a dry s ample is investigated, while with thermoporometry a sample immersed in a li quid is investigated. The probe molecules (nitrogen or noble gas and water or benzene, respectively) differ in size. The features of the two methods a re discussed.