Double-mode relaxation of highly deformed anisotropic vesicles.,Physical Review E

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Double-mode relaxation of highly deformed anisotropic vesicles.
Physical Review E ( IF 2.2 ) Pub Date : 2020-07-07 , DOI: 10.1103/physreve.102.010605
Dinesh Kumar _{1,

2} , Channing M Richter ₁ , Charles M Schroeder _{1,

2,

3}

Affiliation

Lipid vesicles are known to undergo complex conformational transitions, but it remains challenging to systematically characterize nonequilibrium membrane dynamics in flow. Here, we report the direct observation of anisotropic vesicle relaxation from highly deformed shapes using a Stokes trap. Vesicle shape relaxation is described by two distinct characteristic timescales governed by the bending modulus and membrane tension. Interestingly, the fast double-mode timescale is found to depend on vesicle deflation or reduced volume. Experimental results are well described by a viscoelastic model of a deformed membrane. Overall, these results show that vesicle relaxation is governed by an interplay between membrane elastic moduli, surface tension, and vesicle deflation.

中文翻译：

高度变形的各向异性囊泡的双模松弛。

已知脂质囊泡会经历复杂的构象转变，但是系统地表征流动中的非平衡膜动力学仍然具有挑战性。在这里，我们报告使用斯托克斯陷阱从高度变形的形状直接观察到各向异性的囊泡松弛。通过弯曲模量和膜张力控制的两个不同的特征时间尺度来描述囊泡形状松弛。有趣的是，发现快速的双模时标取决于囊泡放气或体积减小。通过变形膜的粘弹性模型很好地描述了实验结果。总体而言，这些结果表明，囊泡松弛受膜弹性模量，表面张力和囊泡放气之间相互作用的支配。

更新日期：2020-07-07

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