Effect of a product on spontaneous droplet motion driven by a chemical reaction of surfactant.,Physical Review E

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Effect of a product on spontaneous droplet motion driven by a chemical reaction of surfactant.
Physical Review E ( IF 2.2 ) Pub Date : 2020-08-03 , DOI: 10.1103/physreve.102.023102
Takahiro Tanabe ₁ , Takuto Ogasawara ₂ , Nobuhiko J Suematsu _{1,

2}

Affiliation

We focus on the self-propelled motion of an oil droplet within an aqueous phase or an aqueous droplet within an oil phase, which originates from an interfacial chemical reaction of surfactant. The droplet motion has been explained by mathematical models, which require the assumption that the chemical reaction increases the interfacial tension. However, several experimental reports have demonstrated self-propelled motion with the chemical reaction decreasing the interfacial tension. Our motivation is to construct an improved mathematical model, which explains these experimental observations. In this process, we consider the concentrations of the reactant and product on the interface and of the reactant in the bulk. Our numerical calculations indicate that the droplet potentially moves in the cases of both an increase and a decrease in the interfacial tension. In addition, the reaction rate and size dependencies of the droplet speed observed in experiments were well reproduced using our model. These results indicate the potential of our model as a universal one for droplet motion.

中文翻译：

表面活性剂的化学反应驱动产品对自发液滴运动的影响。

我们关注于水相内的油滴或油相内的水滴的自推进运动，这是由于表面活性剂的界面化学反应引起的。液滴运动已通过数学模型进行了解释，该数学模型需要假设化学反应会增加界面张力。然而，一些实验报告已经证明了自推进运动与化学反应降低了界面张力。我们的动机是构建一个改进的数学模型，以解释这些实验观察结果。在此过程中，我们考虑了界面上反应物和产物的浓度以及本体中反应物的浓度。我们的数值计算表明，在界面张力增大和减小的情况下，液滴都可能移动。此外，使用我们的模型可以很好地再现实验中观察到的反应速度和液滴速度的大小相关性。这些结果表明我们的模型作为液滴运动通用模型的潜力。

更新日期：2020-08-03

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