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arXiv 1406.5950cond-mat.soft
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Marangoni应力驱动下纯水滴的自推进

Self-propulsion of pure water droplets by spontaneous Marangoni stress driven motion

Ziane Izri, Marjolein N. van der Linden, Sébastien Michelin, Olivier Dauchot

摘要:

我们报告的自发运动在一个完全生物相容的系统组成的纯水滴在油表面活性剂介质的角鲨烷和单油酸甘油酯。来自液滴的水被反胶束溶液溶解,在每个液滴周围产生溶胀的反胶束的浓度梯度。强对流和弱扩散条件允许在足够大的Péclet数的各向同性粒子系统中的自发运动的第一个实验实现,根据最近提出的机制的简单概括。用高浓度的盐溶液代替水,用十四烷代替角鲨烷的实验证实了上述机理。目前的游泳液滴能够携带外部物体,如大胶体,盐晶体,甚至细胞。

英文摘要:

We report spontaneous motion in a fully bio-compatible system consisting of pure water droplets in an oil-surfactant medium of squalane and monoolein. Water from the droplet is solubilized by the reverse micellar solution, creating a concentration gradient of swollen reverse micelles around each droplet. The strong advection and weak diffusion conditions allow for the first experimental realization of spontaneous motion in a system of isotropic particles at sufficiently large Péclet number according to a straightforward generalization of a recently proposed mechanism. Experiments with a highly concentrated solution of salt instead of water, and tetradecane instead of squalane, confirm the above mechanism. The present swimming droplets are able to carry external bodies such as large colloids, salt crystals, and even cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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