Liquid metal spring： oscillating coalescence and ejection of contacting liquid metal droplets  

作　　者：Bin Yuan Zhizhu He Wenqiang Fang Xin Bao Jing Liu 

机构地区：[1]Key Laboratory of Cryogenics, Technical Institute of Physicsand Chemistry, Chinese Academy of Sciences, Beijing 100190,China [2]Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China

出　　处：《Science Bulletin》2015年第6期648-653,M0004,共7页科学通报（英文版）

基　　金：This work was partially supported by the Re- search Funding of the Chinese Academy of Sciences （KGZD-EW-T04-4） and the National Natural Science Foundation of China （81071225）.

摘　　要：With pretty high surface tension, the room temperature liquid metal may inherit with unexpected be- haviors that conventional fluids could not own. Here, we disclosed the coalescence and ejection phenomena of liquid metal droplets via high-speed camera. It was experimen- tally found that, when gently contacting （rather than col- liding） two metal droplets with identical size together in NaOH solution, oscillating coalescence would happen which runs just like a spring after the interface ruptures and forms capillary waves. For two metal droplets with evidently different diameters, the coalescence induces rather unusual ejection phenomena. The large droplet would swallow part of the small one and then eject another much smaller droplet. Such phenomenon provides a direct evidence for the existence of electrical double layer on metal droplets. The dynamics fluid impacting behaviors were quantified through processing images from the recorded movies, and the basic differences between the liquid metal droplets and that of water droplets were clar- ified. Theoretical mechanisms related to the events were preliminarily interpreted. The present finding refreshes the basic understanding of the liquid metal droplets, which also suggests potential values of applying such fundamental effects to characterize viscosity, surface tension, electrical double layer of the metal fluids and droplet formations.与相当高的表面紧张，房间温度液体金属可以与常规液体不能拥有的意外行为继承。这里，我们经由高速度的照相机揭示了液体金属微滴的结合和喷射现象。当轻轻地联系时，它试验性地被发现那(而非碰撞) 有相同尺寸的二金属微滴一起在 NaOH 答案，震荡的结合将发生它就像在接口以后的春天一样的跑破裂并且形成毛状的波浪。为有显然不同的直径的二金属微滴，结合导致相当不平常的喷射现象。大微滴将咽下小的部分然后逐出另一小得多的微滴。如此的现象在金属微滴上为电的双层的存在提供一条直接证据。影响行为的动力学液体通过从记录电影，和液体金属微滴之间的基本差别处理图象被确定，水微滴的被澄清。与事件有关的理论机制 preliminarily 被解释。发现的礼品使液体金属微滴的基本理解清醒，它也建议使用如此的基本效果描绘粘性，表面紧张，金属液体的电的双层和微滴形成的潜在的价值。

关 键 词：Liquid metal spring Oscillatingcoalescence Droplet ejection Electrical doublelayer High-speed image experiment 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TF124.39[金属学及工艺—金属材料]