Oscillation of Speed of a Self-Propelled Belousov-Zhabotinsky Droplet
Oscillation of Speed of a Self-Propelled Belousov-Zhabotinsky Droplet
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DOI：
10.1021/acs.jpclett.6b01539
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发表时间：
2016-09-01
影响因子：
5.7
通讯作者：
Nakata, Satoshi
中科院分区：
文献类型：
--
作者：
Suematsu, Nobuhiko J.;Mori, Yoshihito;Nakata, Satoshi
自行推进的物体可以成为潜在的仿生微机器，但需要一种通用的策略来添加所需的功能。引入一个典型的化学反应是一个简单的答案；然而，问题是如何将化学反应与自推进运动结合起来。我们提出了一种选择化学反应的策略，使其产物或中间体影响自行式物体的驱动力。为了证明这一策略，我们将非线性化学反应Belousov-Zhabotinsky （BZ）反应的水滴放入含有表面活性剂的油相中，其中水滴由表面活性剂和溴的界面反应驱动。结果显示出速度振荡，且与液滴中BZ反应的氧化还原振荡同步。溴是BZ反应的中间体之一，因此液滴运动很好地反映了BZ反应的特征。
Self-propelled objects can become potential biomimetic micromachines, but a versatile strategy is required to add the desired functions. Introducing a characteristic chemical reaction is a simple answer; however, the problem is how the chemical reaction is coupled to the self-propelled motion. We propose a strategy to select the chemical reaction so that its product or intermediate affects the driving force of a self-propelled object. To demonstrate this strategy, we put an aqueous droplet of nonlinear chemical reaction, the Belousov-Zhabotinsky (BZ) reaction, into an oil phase including a surfactant, where an aqueous droplet was driven by an interfacial reaction of the surfactant and bromine. The results exhibited oscillation of speed, and it was synchronized with the redox oscillation of the BZ reaction in the droplet. Bromine is one of the intermediates of the BZ reaction, and thus the droplet motion well-reflected the characteristics of the BZ reaction.