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arXiv 1106.5145cond-mat.softphysics.bio-ph
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液滴诱导的膜出芽转变

Droplet-Induced Budding Transitions of Membranes

Halim Kusumaatmaja, Reinhard Lipowsky

摘要:

最近的实验仿生膜暴露于几个水相的动机,我们从理论上研究的形态与通过水相分离形成的液滴接触的膜。我们集中研究自发曲率可以忽略不计的膜。在小液滴体积下,弯曲能量占主导地位,并且液滴仅部分地被膜包裹。在大体积下,这种配置可能变得不稳定,并经历到液滴(几乎)完全被膜包裹的状态的不连续转变。一个形态图,示出的参数区域,其中发生这种出芽过渡,被构造为膜张力和固有的接触角的液体与膜的函数。定性地讨论了自发曲率的影响。

英文摘要:

Motivated by recent experiments on biomimetic membranes exposed to several aqueous phases, we theoretically study the morphology of a membrane in contact with a liquid droplet formed via aqueous phase separation. We concentrate on membranes with negligible spontaneous curvature. At small droplet volume, bending energy dominates and the droplet is only partially wrapped by the membrane. At large volume, this configuration can become unstable and undergo a discontinuous transition to a state, in which the droplet is (almost) completely wrapped by the membrane. A morphology diagram, showing the parameter region where such budding transition occurs, is constructed as a function of the membrane tension and the intrinsic contact angle of the liquid with the membrane. The effects of spontaneous curvature are discussed qualitatively.

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