On the use of shear rheology to formulate stable foams. Example of a lyotropic lamellar phase

Zenaida Briceño-Ahumada, Armando Soltero, Amir Maldonado, Javier Perez, Dominique Langevin*, Marianne Impéror-Clerc

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In order to formulate stable foams with gels, it is important to know their shear rheology properties. We illustrate this fact using a weak gel made of a lyotropic lamellar phase (SDS/hexanol/brine system). The effect of shear is investigated using rheology experiments coupled with Small Angle X-ray Scattering (rheo-SAXS) using synchrotron radiation. According to oscillatory tests, the samples exhibit a weak gel behavior. Steady state experiments evidence a shear-induced transition from lamellar to onion (multilamellar vesicle – MLV) textures at moderate shear rates. After the shear is stopped, there is a recovery from the onion texture to the initial lamellar texture within 30 min, as directly demonstrated by the rheo-SAXS data. The lamellar to onion transition is therefore reversible. This excludes the possibility for the foams to be stabilized by onions adsorbed at the air–water interface as in foams made with other types of lamellar phases. In the example presented, the foam stability originates from the bulk rheological properties of the lamellar phase.

Original languageEnglish
Pages (from-to)110-117
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume507
DOIs
StatePublished - 20 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016

Keywords

  • Lamellar phase
  • Multilamellar vesicles
  • Rheo-SAXS
  • Rheology

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