Phase Transition Processes in Surfactant Adsorption Layers
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Updated: Oct 10, 2026

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
Published on: September 9, 2022
1International Medical Physicochemical Centre, Medical University Donetsk, Prospekt Ilischa 16, Donetsk, 83003, Ukraine
Abstract:
Adsorption data in the form of surface tension vs bulk concentration isotherms having strong changes in the slope have often been discussed in the literature in terms of phase transitions in the adsorption layer. It will be shown thermodynamically that these apparent kink points in the isotherms are unreal. A phase transition would cause a completely opposite change in the isotherm. Experimental surface tension data for sodium octanoate and dodecyl ammonium chloride obtained from the literature are reinterpreted on the basis of the Frumkin and reorientation isotherms. Copyright 2000 Academic Press.
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