Surfactant foams doped with laponite: unusual behaviors induced by aging and confinement
- 12 October 2009
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Soft Matter
- Vol. 5 (24), 4975-4982
- https://doi.org/10.1039/b914923f
Abstract
We report results on foams stabilized by surfactant (sodium dodecyl sulfate) and containing clay particles (laponite). We have studied how these foams age with time (drainage and coarsening) and their rheological properties. Due to the doping with laponite, which provides an additional time evolution of the foaming fluid itself, unusual behaviors are observed: especially, drainage arrest and re-start and enhanced elasticity are observed as a function of time. These results can be interpreted in terms of both confinement of the laponite inside the foam liquid channels, and competition between the laponite aging and the one of the foam (controlled by its own physical parameters). By playing with these foam parameters and those of the bulk solution containing laponite, we can control the time evolution and these non-monotonous features. Qualitatively, it is found that time, laponite concentration and confinement have all the same effect, enhancing the jamming of the interstitial fluid inside the foam.This publication has 26 references indexed in Scilit:
- Oscillatory rheology of aqueous foams: surfactant, liquid fraction, experimental protocol and aging effectsSoft Matter, 2009
- Theoretical model of viscous friction inside steadily sheared foams and concentrated emulsionsPhysical Review E, 2008
- Aqueous foams stabilized by Laponite and CTABColloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
- Viscosity effects in foam drainage: Newtonian and non-newtonian foaming fluidsThe European Physical Journal E, 2006
- Rheology of liquid foamJournal of Physics: Condensed Matter, 2005
- Electrical conductivity of dispersions: from dry foams to dilute suspensionsJournal of Physics: Condensed Matter, 2005
- Protein and surfactant foams: linear rheology and dilatancy effectColloids and Surfaces A: Physicochemical and Engineering Aspects, 2005
- Quantitative description of foam drainage: Transitions with surface mobilityThe European Physical Journal E, 2004
- Liquid-solid transition of Laponite suspensions at very low ionic strength: Long-range electrostatic stabilisation of anisotropic colloidsEurophysics Letters, 2000
- Uniform foam production by turbulent mixing: new results on free drainage vs. liquid contentZeitschrift für Physik B Condensed Matter, 1999