Gas Adsorption and Desorption

Also see gas adsorption

The desorption isotherm may be considered to be a record of the removal of gas from the sample and as such is the reverse of the adsorption isotherm. The sample must be saturated with gas first before the full desorption isotherm can be measured. The desorption isotherm often follows a different path from the adsorption isotherm yielding a hysteresis loop; its shape indicates something about the complexity and shape of the pores within the sample. Pore size distribution can be calculated from both the adsorption and desorption isotherms, according to preference; both will give different results if a hysteresis loop is present.

---

---

© Coulter International Corporation, 1996. All rights reserved. Copyrights and Trademarks