Vesicle dynamics in elongation flow: Wrinkling instability and bud formation

Details Vesicle dynamics in elongation flow: Wrinkling instability and bud formation Vesicle dynamics in elongation flow: Wrinkling instability and bud formation

2007-04-30

arxiv.org/abs/0704.3846v1

Physical Review Letters 99, 178102 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.178102

We present experimental results on the relaxation dynamics of vesicles subjected to a time-dependent elongation flow. We observed and characterized a new instability, which results in the formation of higher order modes of the vesicle shape (wrinkles), after a switch in the direction of the gradient of the velocity. This surprising generation of membrane wrinkles can be explained by the appearance of a negative surface tension during the vesicle deflation, due to compression in a sign-switching transient. Moreover, the formation of buds in the vesicle membrane has been observed in the vicinity of the dynamical transition point.

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