Influence of NaCl on the behavior of PEO-PPO-PEO triblock copolymers in solution, at interfaces, and in asymmetric liquid films

O.V. Eliseeva, N.A.M. Besseling, L.K. Koopal, M.A. Cohen Stuart

Research output: Contribution to journalArticleAcademicpeer-review

36 Citations (Scopus)

Abstract

The solution behavior of the polymeric surfactant Pluronic F127 (PEO 99PPO65PEO99) and its adsorption behavior on aqueous - silica and aqueous - air interfaces, as well as the disjoining pressure isotherms of asymmetric films (silica/aqueous film/air) containing F127, are studied. The interfacial properties of adsorbed F127 layers (the adsorbed amount ¿ and the thickness h) as well as the aqueous wetting film properties [film thickness (h) and refractive indexes] were studied via ellipsometry. The solution properties of F127 were investigated using surface tensiometry and light scattering. The interactions between the air -water and silica - water interfaces were measured with a thin film pressure balance technique (TFB) and interpreted in terms of disjoining pressure as a function of the film thickness. The relations between the behaviors of the asymmetric films, adsorption at aqueous air, and aqueous silica interfaces and the solution behavior of the polymeric surfactant are discussed. Special attention is paid to the influence of the concentrations of F127 and NaCl. Addition of electrolyte lowers the critical micelle concentration, diminishes adsorption on silica, and increases the thickness of the asymmetric film.
Original languageEnglish
Pages (from-to)4954-4963
JournalLangmuir
Volume21
Issue number11
DOIs
Publication statusPublished - 2005

Keywords

  • oxide) block-copolymer
  • aqueous-solution
  • nonionic surfactant
  • foam films
  • cationic surfactants
  • air/water interface
  • disjoining pressure
  • water/air interface
  • protein adsorption
  • micellization

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