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Experimental set-up. Lamellas are pushed or pulled using a syringe pump. The thickness of the wetting film is probed by a laser at total internal reflection. The shift of the beam due to the film thickness is recorded on a PSD.
(a) Typical signals recorded from the PSD for a train of four lamellas spaced by 6 mm pushed at a 5 mm/s velocity. The arrows show the back and forth motions corresponding to the push-pull action of the syringe pump. (b) Zoom of the spectrum. The black lines and circles correspond, respectively, to the total and differential signals.
Shapes of the SLES wetting film when the lamella train is pushed and pulled at a 5 mm/s velocity.
Thickness evolutions of SDS and SLES wetting films vs. Ca, for a train of lamellas spaced by 6 mm:0 mm that corresponds to the middle in between the lamellas (circles), +1 mm (squares), and −1 mm (triangles). Insert: Example of a very wet foam.
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