title: New method to determine the viscoelastic properties of admicelles around the stick-slip transition.
abstract: We report on a new method by which, for the first time, the viscoelastic properties of an adsorbed surfactant layer on a solid surface are measured. It is based on an analysis of the amplitude and the phase angle of the pressure fluctuations induced by a pulsating flow of a Newtonian surfactant solution through cylindrical pores. This method is subsequently used to determine the viscoelastic properties of an admicelle, formed when flushing surfactant solutions through nanopores, around the stick-slip transition. We find that the admicelle responds elastically for flow strengths below the transition and beyond the viscous. This is in agreement with the hypothesis formulated earlier (Cheikh, C.; Koper, G. J. M. Phys. Rev. Lett. 2003, 91, 156102).
authors.affiliation: DelftChemTech, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
authors.forename: C
authors.initials: C
authors.lastname: Cheikh
authors.forename: G J M
authors.initials: GJ
authors.lastname: Koper
authors.forename: T G M
authors.initials: TG
authors.lastname: van de Ven