Active hole generation in a liquid droplet dissolving into a binary solvent
Active hole generation in a liquid droplet dissolving into a binary solvent
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溶解在二元溶剂中的液滴中的活性空穴生成
DOI：
10.1039/c8sm00357b
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发表时间：
2018
期刊：
影响因子：
3.4
通讯作者：
Kurita Rei
中科院分区：
文献类型：
--
作者：
Oikawa Noriko;Fukagawa Keita;Kurita Rei
在液-液溶解中，相分离的临界点由温度决定。当溶剂由多组分组成时，溶剂中的摩尔分数也起着控制参数的作用。在本研究中，离子液体溶解于由乙醇和水组成的二元溶剂中。在该系统中发现，在临界点附近，离子液体的液滴中自发地产生了一个空穴。离子液体和二元溶剂的浓度通过它们的亲合力相互作用产生了这个空穴。界面张力的空间不均匀性是由于不稳定机制引起的浓度波动的放大而引起的，并导致马兰戈尼效应产生空穴。孔在液滴内部运动，从而导致液滴运动。本系统不仅提供了一种新型的溶解过程，而且还提供了在液滴中实现活性物质的特殊实例。
In liquid–liquid dissolution, the critical point of phase separation is determined by the temperature. When the solvent consists of multi-components, in contrast, the mole fractions in the solvent also take on the role of control parameter. In this study an ionic liquid dissolves into a binary solvent composed of ethanol and water. It is found in this system that, near the critical point, a hole is spontaneously created in the droplet of the ionic liquid. The creation of the hole is initiated by a mutual interaction between the concentrations of the ionic liquid and the binary solvent via their affinity. A spatial inhomogeneity of the interfacial tension is induced through an amplification of fluctuation in the concentration due to an instability mechanism, and causes the Marangoni effect to create the hole. The hole moves inside the droplet and consequently leads to the motion of the droplet. The present system provides not only a new type of dissolution process but also a peculiar example of active matter realized in a liquid droplet.