5. Obtaining adsorption-desorption isotherms
5.1 Sample preparation
Prior to any adsorption, the surface of the samples studied must be cleaned of any species retained by physical adsorption.
This degassing operation must be carried out very carefully if reproducible results are to be obtained.
In theory, it would be sufficient to create a high vacuum above the sample; in practice, heating the sample is required to accelerate desorption. However, it is important to choose a temperature that will not degrade the sample (as in the case of organic solids) or alter its surface properties.
Sample processing conditions can be optimized by prior thermal analysis, in particular by thermogravimetry
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Obtaining adsorption-desorption isotherms
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