Macroscopic response of wormlike micelles to elongational flow

Lynn M. Walker, Paula Moldenaers, Jean François Berret

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Opposed nozzle flow is used to measure the elongational properties of wormlike micelles. Well-characterized semidilute micellar solutions of CPCl/Sal in concentrated brine are used. By varying temperature and concentration, the viscoelastic properties (τR, G0) of the equilibrium solutions can be controlled and the influence of viscoelasticity on elongational viscosity probed. Results indicate three regimes of steady elongational behavior: a constant viscosity at low elongational rates, an increase to a maximum viscosity, and then a subsequent drop in viscosity. Scaling of the macroscopic elongational properties with linear viscoelastic parameters and similarities between these solutions and entangled polymer solutions indicate that semidilute CPCl/Sal solutions do not exhibit significant changes in micellar structure and may provide model systems for studying the influence of complex flow fields on entangled polymer solutions.

Original languageEnglish (US)
Pages (from-to)6309-6314
Number of pages6
JournalLangmuir
Volume12
Issue number26
DOIs
StatePublished - Dec 25 1996
Externally publishedYes

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