title: Marangoni stresses and surface compression rheology of surfactant solutions. Achievements and problems.
abstract: In the presence of soluble surfactants, the motion of liquid surfaces involves Marangoni effects. As a consequence, the surfaces exhibit elastic responses, even frequently behaving as rigid surfaces, especially at low surfactant concentration. The Marangoni effects can be conveniently quantified introducing surface viscoelastic compression parameters that characterize the mechanical response of the surface near equilibrium. Many experimental techniques allow measuring the viscoelastic parameters. However, many difficulties are encountered during the interpretation of the surface response in the various types of hydrodynamic velocity fields involved in the different techniques. The role of adsorption and desorption energy barriers appears crucial, despite the fact that little is known yet about their values. In this short review, we will present examples illustrating the different problems.
authors: Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris Sud 11, Orsay, France. Electronic address: langevin@lps.u-psud.fr.
authors: D
authors: D
authors: Langevin
authors: Departamento de Química Física I, Universidad Complutense, 28040 Madrid, Spain.
authors: F
authors: F
authors: Monroy
keywords: Liquid surfaces; Marangoni effect; Monolayers