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arXiv 0704.3846cond-mat.softcond-mat.stat-mechphysics.flu-dyn
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伸长流动中的囊泡动力学:起皱不稳定性和芽的形成

Vesicle dynamics in elongation flow: Wrinkling instability and bud formation

Vasiliy Kantsler, Enrico Segre, Victor Steinberg

摘要:

我们目前的实验结果的松弛动力学的囊泡进行时间依赖性的伸长流。我们观察到并表征了一种新的不稳定性,在速度梯度方向切换后,这种不稳定性会导致囊泡形状(皱纹)的高阶模式的形成。这种令人惊讶的膜褶皱的产生可以解释为在囊泡放气期间由于符号转换瞬态中的压缩而出现负表面张力。此外,在动态转变点附近观察到囊泡膜中芽的形成。

英文摘要:

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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