Polyhedral Liquid Marbles
Polyhedral Liquid Marbles
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DOI：
10.1002/adfm.201808826
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发表时间：
2019-06-01
影响因子：
19
通讯作者：
Fujii, Syuji
中科院分区：
文献类型：
--
作者：
Geyer, Florian;Asaumi, Yuta;Fujii, Syuji
本文介绍了一种新型的装甲液滴，即所谓的多面体液体大理石。这些装甲液体弹珠由通过聚对苯二甲酸乙二醇酯制成的疏水性六边形板稳定的液滴组成，这些液滴吸附在液-气界面上。取决于板尺寸和液滴直径的特定组合，板自组装成高度有序的六边形排列的域。即使是四面体，五面体和立方体形状的液体大理石组成的只有4至6个板块被证明。在内部液体蒸发期间，由于板在液体-空气界面处的高吸附能，总表面积保持恒定，导致强烈变形的多面体液体弹珠。与此一致，由于刚性六边形板施加的强界面干扰，获得了高度不对称的多面体液体弹珠和字母。这对于较大的板尺寸尤其明显，导致具有异常尖锐边缘（例如，矩形边缘）的液体大理石。多面体液体大理石同时暴露于水、氨或四氢呋喃蒸气时表现出各种刺激响应行为。空气驱动的多面体液体弹珠漂浮在水面上可以达到每秒几厘米的速度。
A new type of armored droplet, a so-called polyhedral liquid marble, is introduced in this work. These armored liquid marbles consist of liquid droplets stabilized by hydrophobic hexagonal plates made of poly(ethylene terephthalate), which adsorb to the liquid-air interface. Depending on the specific combination of plate size and droplet diameter, the plates self-assemble into highly ordered hexagonally arranged domains. Even tetrahedral-, pentahedral-, and cube-shaped liquid marbles composed of only 4 to 6 plates are demonstrated. During evaporation of the internal liquid, due to the high adsorption energy of the plates at the liquid-air interface, the overall surface area stays constant, resulting in strongly deformed polyhedral liquid marbles. In line with this, highly asymmetric polyhedral liquid marbles and letters are obtained due to the strong interfacial jamming exerted by the rigid hexagonal plates. This is particularly pronounced for larger plate sizes, leading to liquid marbles with unusually sharp edges (for example, rectangular edges). The polyhedral liquid marbles exhibit various stimuli-responsive behaviors simultaneously being exposed to water, ammonia, or tetrahydrofuran vapors. Air-driven polyhedral liquid marbles floating on water can reach velocities of several centimeters per second.