Surfactant Driven Fracture of Interfacial Particle Rafts

Details Surfactant Driven Fracture of Interfacial Particle Rafts Surfactant Driven Fracture of Interfacial Particle Rafts

2005-09-29

arxiv.org/abs/cond-mat/0509781v2

Phys. Rev. Lett. 96, 178301 (2006)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, revised verison

Scientific paper

10.1103/PhysRevLett.96.178301

We investigate the dynamic fracture of a close-packed monolayer of particles, or particle raft, floating at a liquid-gas interface induced by the localised addition of surfactant. Unusually for a two-dimensional solid, our experiments show that the speed of crack propagation here is not affected by the elastic properties of the raft. Instead it is controlled by the rate at which surfactant is advected to the crack tip by means of the induced Marangoni flows. Further, the velocity of propagation is not constant in time and the length of the crack scales as $t^{3/4}$. More broadly, this surfactant induced rupture of interfacial rafts suggests ways to manipulate them for applications.

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