Physisorption
Physisorption measurements enable the determination of accessible (BET) surface area, pore volume, and pore size distribution of porous materials and fine powders.
N2 gas is the standard adsorptive. BET surface areas can be measured between 1 m2/ g and several thousand m2/ g. Pore size distribution in the region around 0.5 nm – 30 nm is calculated based on BJH or DFT approaches (many other models are also available). Furthermore, Kr gas can be utilized for small amounts of the sample or low overall surface area. Water vapor measurements enable quantifying adsorbate-adsorbent interactions and the polarity of the sample surface. Sample activation typically takes place between 25 – 250 °C under a vacuum.
The N2 and Kr physisorption measurements are carried out with an autosorb 6 from Quantachrome at -196 °C.
The water sorption measurements are carried out with a 3Flex from Micromeritics.
