Interfacial tension of solid materials against dense carbon dioxide

In the Young equation, only two of the four unknowns are measurable. They are the liquid interfacial tension σlvσlv and the contact angle θ  . To solve this equation, another correlation is required. In solving this equation, a better understanding of the magnitude of the solid interfacial tension σsvσsv and the solid–liquid interfacial tension σslσsl is expected. The possibility of a theoretical estimation of the contact angle θ   is sought as an alternative to the experimental method. In this paper, an attempt to calculate the solid interfacial tension σsvσsv is reported. It is based on the intermolecular interaction which is mathematically described in the parameter ΦslΦsl according to Good. The calculated σsvσsv values for PTFE, steel, and glass surrounded by dense carbon dioxide are verified by comparing those values obtained from aqueous and ethanolic systems. Furthermore, the solid interfacial tension σsvσsv is also used to forecast the water drop contact angle θ. The calculated values are compared with the experimental measured ones.

In this paper, an attempt to solve the Young equation by means of the intermolecular interaction parameter ΦslΦsl according to Good and co-workers is presented.Figure optionsDownload as PowerPoint slide