Structural Signature of a Brittle-to-Ductile Transition in Self-Assembled Networks

Details Structural Signature of a Brittle-to-Ductile Transition in Self-Assembled Networks Structural Signature of a Brittle-to-Ductile Transition in Self-Assembled Networks

2012-03-05

arxiv.org/abs/1203.0951v1

Phys. Rev. Lett. 107, 148302 (2011)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.107.148302

We study the nonlinear rheology of a novel class of transient networks, made of surfactant micelles of tunable morphology reversibly linked by block copolymers. We couple rheology and time-resolved structural measurements, using synchrotron radiation, to characterize the highly nonlinear viscoelastic regime. We propose the fluctuations of the degree of alignment of the micelles under shear as a probe to identify a fracture process. We show a clear signature of a brittle-to-ductile transition in transient gels, as the morphology of the micelles varies, and provide a parallel between the fracture of solids and the fracture under shear of viscoelastic fluids.

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