A surfactants reaction model for reciprocating motion of a self-propelled droplet
A surfactants reaction model for reciprocating motion of a self-propelled droplet
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自推进液滴往复运动的表面活性剂反应模型
DOI：
10.1039/d0sm01500h
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发表时间：
2021
期刊：
影响因子：
3.4
通讯作者：
and Masaharu Nagayama
中科院分区：
文献类型：
--
作者：
Shinpei Tanaka;Satoshi Nakata;and Masaharu Nagayama
本文报道了表面活性剂水溶液表面上漂浮的自推进液滴的往复运动的实验观察和一个能够再现所观察到的液滴行为的简单反应模型。在准一维环形通道中观察到往复运动，因此往复运动不是由边界处的反射引起的。为了理解往复运动，我们的模型假设从液滴发射的表面活性物质和溶解在水溶液中的表面活性剂之间的反应。该反应引起表面张力梯度的反转，从而引起液滴的往复运动。我们表明，该模型可以重现实验结果半定量地使用数值模拟与现实的参数。
We report herein experimental observations of the reciprocating motion of a self-propelled droplet floating on the surface of an aqueous surfactant solution and a simple reaction model capable of reproducing the observed behavior of the droplet. The reciprocating motion was observed in a quasi-one-dimensional annular channel, so the reciprocation was not caused by reflections at boundaries. To understand the reciprocation, our model assumes a reaction between the surface active substance emitted from the droplet and surfactants dissolved in the aqueous solution. This reaction invokes an inversion of the surface tension gradient and thus the droplet's reciprocation. We show that the model can reproduce experimental results semi-quantitatively using numerical simulations with realistic parameters.