Effect of cosurfactant on the free-drainage regime of aqueous foams.
We report results of drainage in aqueous foams of small bubble size D (D=180 microm) prepared with SDS-dodecanol solutions. We have performed free-drainage experiments in which local drainage rates are measured by electrical conductivity and by light scattering techniques. We have investigated the role of the surfactant-cosurfactant mass ratio on the drainage regime. The results confirm that a drainage regime corresponding to a high surface mobility can indeed be found for such small bubbles, and show that an increase in the cosurfactant content can induce a transition to a low surface mobility drainage regime. We show that the transition is not linked to variations of the bulk properties, but rather to variations of the interfacial properties. However, the results show that the added amount of dodecanol to trigger the transition is quite high, evidencing that the relevant control parameter for drainage regimes includes both bubble size and interfacial contributions.
Cervantes-Martínez
Alfredo
A
Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Apdo. Postal 130, Sonora, 83000 Hermosillo, Mexico.
Saint-Jalmes
Arnaud
A
Maldonado
Amir
A
Langevin
Dominique
D
D007851:Dodecanol / Q000737:chemistry*; D005740:Gases; D010316:Particle Size; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D005740:Gases; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; D007851:Dodecanol; D012967:Sodium Dodecyl Sulfate