Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: POSTERS Rheology

CPP 7.18: Poster

Montag, 25. Februar 2008, 16:45–19:00, Poster A

Rupture dynamics of smectic bubbles — •Frank Müller and Ralf Stannarius — Institut für Experimentelle Physik, Otto-von-Guericke Universität, 39106 Magdeburg, Germany

Equilibrium shapes of thin liquid membranes are well understood. On the other hand, when such films undergo fast transitions from a non-equilibrium to an equilibrium state like rupture, different dynamical mechanisms are involved which are in general poorly understood. We study such phenomena experimentally with a fast camera (up to 100.000 fps), using smectic liquid crystal bubbles as model membranes [1]. We observe several unexpected phenomena like 1. a global thickening of the film during rupture, 2. the propagation of mechanical waves, which result in light scattering, 3. an instability of the moving rim that separates the film from the hole and 4. the formation of a brim, which is due to the spherical shape of the film. All these phenomena are strongly dependent on film thickness.

[1] Müller F, Kornek U, and Stannarius R: Experimental study of the bursting of inviscid bubbles, Phys. Rev. E 75 065302(R), 2007