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Open AccessFeature PaperArticle

Investigation of Interfacial Free Energy of Three-Phase Contact on a Glass Sphere in Case of Cationic-Anionic Surfactant Aqueous Mixtures

1
Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
2
Department of Inorganic Chemistry, University of Sofia, 1164 Sofia, Bulgaria
3
Department of Physical Chemistry, University of Sofia, 1164 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(6), 573; https://doi.org/10.3390/coatings10060573
Received: 21 May 2020 / Revised: 10 June 2020 / Accepted: 15 June 2020 / Published: 18 June 2020
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–air interface. Calculated surface tension of solid–air interface vs. concentration for C10 amine and mixed systems are close to those for the liquid–air surface, but are slightly lower. In the case of mixed systems, the graph has a specific structure similar to that of liquid–air surface dependence. In contrast to the solid–air interface results, the solid–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. View Full-Text
Keywords: surfactant surface tension; three-phase contact; contact angle; wetting surfactant surface tension; three-phase contact; contact angle; wetting
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Alexandrova, L.A.; Grigorov, L.S.; Grozev, N.A.; Karakashev, S.I. Investigation of Interfacial Free Energy of Three-Phase Contact on a Glass Sphere in Case of Cationic-Anionic Surfactant Aqueous Mixtures. Coatings 2020, 10, 573.

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