title: Interfacial tension of solid materials against dense carbon dioxide.
abstract: In the Young equation, only two of the four unknowns are measurable. They are the liquid interfacial tension sigma lv and the contact angle theta. To solve this equation, another correlation is required. In solving this equation, a better understanding of the magnitude of the solid interfacial tension sigma sv and the solid-liquid interfacial tension sigma sl is expected. The possibility of a theoretical estimation of the contact angle theta is sought as an alternative to the experimental method. In this paper, an attempt to calculate the solid interfacial tension sigma sv is reported. It is based on the intermolecular interaction which is mathematically described in the parameter Phi sl according to Good. The calculated sigma sv 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 sigma sv is also used to forecast the water drop contact angle theta. The calculated values are compared with the experimental measured ones.
authors.affiliation: Hamburg University of Technology, Eissendorferstrasse 38, 21073 Hamburg, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Sutjiadi-Sia
authors.forename: P
authors.initials: P
authors.lastname: Jaeger
authors.forename: R
authors.initials: R
authors.lastname: Eggers