Abstract
The measurement of the energy of interaction of a molecule with a surface as a function of coverage provides information on the state of the surface and on the thermodynamic characteristics of the adsorption process. Access to Δ ads H is usually obtained on polycrystalline materials by means of a microcalorimeter connected to a dosing device which enables the simultaneous measurement of small uptakes and related heats. Small increments in the adsorba te from the lowest coverage to saturation can thus be evaluated. Successive adsorption-desorption cycles allow the separation of effects due to reversible and irreversible phenomena. The adsorption of the same adsorptive onto variously pretreated solids or on materials of different origin yield evidence of differences in the state of the surface. The application of this technique in various fields of surface science will be reported and the usefulness of joint use of microcalorimetry with other techniques will be stressed.
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