Phase transition in the adsorbed layer of catanionic surfactants at the air/solution interface

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Dynamic and equilibrium surface tension measurements were performed on aqueous solutions of three symmetric chain catanionic surfactants (dodecyltrimethylammonium dodecyl sulfate, DTA·DS, decyltrimethylammonium decyl sulfate, DeTA·DeS, and octyltrimethylammonium octyl sulfate, OTA·OS). The surface tension of DTA·DS and DeTA·DeS solutions shows a peculiar time dependence. Depending on the surfactant concentration, there is a latent period while the surface tension is almost constant followed by a pronounced decrease toward the equilibrium value. The equilibrium surface tension against the logarithm of the surfactant concentration can be characterized by two linear regions. The surface tension of OTA·OS solutions changes regularly with both the time and concentration as in the case of ordinary surfactant solutions. The dynamic and equilibrium surface tension data were interpreted in terms of a two-dimensional gas/condensed phase transition. A molecular interaction model was developed to describe the adsorption of the catanionic surfactants. In agreement with the experimental observations, the model predicts phase transition in the adsorbed layer of the DTA·DS and DeTA·DeS.

Original languageEnglish
Pages (from-to)3200-3205
Number of pages6
JournalLangmuir
Volume16
Issue number7
DOIs
Publication statusPublished - Apr 4 2000

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Surface-Active Agents
Surface tension
interfacial tension
Surface active agents
Phase transitions
surfactants
air
Air
sulfates
Sulfates
Molecular interactions
molecular interactions
logarithms
time dependence
Gases
aqueous solutions
Adsorption
adsorption
gases

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Phase transition in the adsorbed layer of catanionic surfactants at the air/solution interface. / Gilányi, T.; Mészáros, R.; Varga, Imre.

In: Langmuir, Vol. 16, No. 7, 04.04.2000, p. 3200-3205.

Research output: Contribution to journalArticle

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N2 - Dynamic and equilibrium surface tension measurements were performed on aqueous solutions of three symmetric chain catanionic surfactants (dodecyltrimethylammonium dodecyl sulfate, DTA·DS, decyltrimethylammonium decyl sulfate, DeTA·DeS, and octyltrimethylammonium octyl sulfate, OTA·OS). The surface tension of DTA·DS and DeTA·DeS solutions shows a peculiar time dependence. Depending on the surfactant concentration, there is a latent period while the surface tension is almost constant followed by a pronounced decrease toward the equilibrium value. The equilibrium surface tension against the logarithm of the surfactant concentration can be characterized by two linear regions. The surface tension of OTA·OS solutions changes regularly with both the time and concentration as in the case of ordinary surfactant solutions. The dynamic and equilibrium surface tension data were interpreted in terms of a two-dimensional gas/condensed phase transition. A molecular interaction model was developed to describe the adsorption of the catanionic surfactants. In agreement with the experimental observations, the model predicts phase transition in the adsorbed layer of the DTA·DS and DeTA·DeS.

AB - Dynamic and equilibrium surface tension measurements were performed on aqueous solutions of three symmetric chain catanionic surfactants (dodecyltrimethylammonium dodecyl sulfate, DTA·DS, decyltrimethylammonium decyl sulfate, DeTA·DeS, and octyltrimethylammonium octyl sulfate, OTA·OS). The surface tension of DTA·DS and DeTA·DeS solutions shows a peculiar time dependence. Depending on the surfactant concentration, there is a latent period while the surface tension is almost constant followed by a pronounced decrease toward the equilibrium value. The equilibrium surface tension against the logarithm of the surfactant concentration can be characterized by two linear regions. The surface tension of OTA·OS solutions changes regularly with both the time and concentration as in the case of ordinary surfactant solutions. The dynamic and equilibrium surface tension data were interpreted in terms of a two-dimensional gas/condensed phase transition. A molecular interaction model was developed to describe the adsorption of the catanionic surfactants. In agreement with the experimental observations, the model predicts phase transition in the adsorbed layer of the DTA·DS and DeTA·DeS.

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