The thinning and the lifetime of foam and emulsion Ðlms formed in a model experimental cell have been investigated. The foam Ðlms were stabilised by either sodium dodecyl sulfate or sodium dodecyl polyoxyethylene-2 sulfate. The emulsion Ðlms contained either Tween 20 or Span 20. The time of hydrodynamic drainage of the Ðlms increased linearly as the logarithm of the surfactant concentration. Th...

[1 ] D.A. Edwards, H. Brenner, Darsh T. Wasan, Interfacial transport processes and rheology. Butterworth { Heinemann Boston, 1991. [2 ] Ivan Ivanov, Interfaces, foams and emulsions, Course notes, 1994 (unpublished). [3 ] A.K. Malhatori and D.T. Wasan, E ect of surfactant adsorption { desorption kinetics and interfacial rheological properties on the rate of drainage of foam and emulsion lms. Che...

We introduce a new class of Pickering foams which can be manipulated using a magnetic field. These foams are stabilized by a mixture of magnetic and nonmagnetic particles. They exhibit excellent stability in the absence of a magnetic field, but can be rapidly destroyed on demand with the application of a threshold field. We characterize their stability in the absence of a magnetic field by meas...

We investigate the drainage of a 2D microfoam in a vertical Hele-Shaw cell, and show that the Marangoni stress at the air-water interface generated by a constant temperature gradient applied in situ can be tuned to control the drainage. The temperature gradient is applied in such a way that thermocapillarity and gravity have an antagonistic effect. We characterize the drainage over time by meas...

We report foam coarsening studies which were performed in the International Space Station (ISS) to suppress drainage due gravity. Foams and bubbly liquids with controlled liquid fractions φ between...

The remarkable stability of particle-stabilized foams and the opportunity to use them for production of novel porous materials have been attracting the researchers' attention in the recent years. The major aim of the current study is to clarify the factors, controlling the foamability and stability of foams, formed from concentrated silica suspensions in the presence of the amphoteric surfactan...

We have developed a new class of bistable Pickering foams, which can remain intact for weeks at room temperature but can be destroyed rapidly and on-demand with the use of a magnetic field. Such responsive foam systems can find application in various industrial and environmental processes that require controlled defoaming. These foams are stabilized by particles of hypromellose phthalate (HP-55...

Liquid foams are an extreme case of multiphase flow systems: capable of flow despite a very high dispersed phase volume fraction, yet exhibiting many characteristics of not only viscoelastic materials but also elastic solids. The non-trivial, well-defined geometry of foam bubbles is at the heart of a plethora of dynamical processes on widely varying length and time scales. We highlight recent d...