Abstract
We have employed a quartz microbalance technique to record adsorption isotherms on silver and gold surfaces whose roughness has also been characterized by x-ray reflectivity or scanning tunneling microscopy. We observe strikingly different behavior for two different liquid adsorbates (oxygen and nitrogen), and attribute this to a difference in their surface tension. Our results demonstrate the impact that capillary condensation phenomena can have on the interpretation of adsorption data, particularly with regards to the fractal nature of the substrate. Valuable information on surface morphology can nonetheless be obtained from adsorption isotherms, if combined with alternate experimental techniques.
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Krim, J., Panella, V. Probing Surface Roughness and Porosity through Adsorption of Wetting Layers. MRS Online Proceedings Library 366, 231–239 (1994). https://doi.org/10.1557/PROC-366-231
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DOI: https://doi.org/10.1557/PROC-366-231