Investigation of Interfacial Free Energy of Three-Phase Contact on a Glass Sphere in Case of Cationic-Anionic Surfactant Aqueous Mixtures
| Autor: | Nikolay A. Grozev, Stoyan I. Karakashev, Lidia Alexandrova, L. Grigorov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
wetting
Materials science Aqueous solution Cationic polymerization Surfaces and Interfaces surfactant surface tension Surfaces Coatings and Films Contact angle Surface tension chemistry.chemical_compound Sulfonate Adsorption chemistry Pulmonary surfactant Chemical engineering lcsh:TA1-2040 three-phase contact Materials Chemistry Wetting lcsh:Engineering (General). Civil engineering (General) contact angle |
| Zdroj: | Coatings, Vol 10, Iss 573, p 573 (2020) Coatings Volume 10 Issue 6 |
| ISSN: | 2079-6412 |
| Popis: | The wetting of adsorbed surfactants solids is important for various technological applications in particular for the process of foam flotation. The present work aims at calculating the surface tensions of the three phase interfaces at different surfactant concentrations using the Girifalco and Good method. For this purpose, the surface tension and contact angle vs. surfactant concentration of the test substances amines and sulfonates and their mixture were measured for liquid&ndash air interface. Calculated surface tension of solid&ndash air interface vs. concentration for C10 amine and mixed systems are close to those for the liquid&ndash air surface, but are slightly lower. In the case of mixed systems, the graph has a specific structure similar to that of liquid&ndash air surface dependence. In contrast to the solid&ndash air interface results, the solid&ndash liquid surface tension values are significantly lower. In case of the mixed surfactant systems, C10amine/C10 sulfonate, a synergetic effect on the surface tension is observed. The specific behavior of the mixed systems is interpreted with the emergence of aggregates consisting of the anionic and cationic surfactants. It is shown that in the whole area of concentrations complete wetting does not occur. |
| Databáze: | OpenAIRE |
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