Liquid Marble Coalescence and Triggered Microreaction Driven by Acoustic Levitation
Liquid Marble Coalescence and Triggered Microreaction Driven by Acoustic Levitation
复制标题
DOI：
10.1021/acs.langmuir.7b00347
复制
发表时间：
2017-06-27
期刊：
影响因子：
3.9
通讯作者：
Geng, Xingguo
中科院分区：
文献类型：
--
作者：
Chen, Zhen;Zang, Duyang;Geng, Xingguo
液体小球在微反应器领域显示出良好的应用前景。控制两个或多个液体大理石之间的聚结是至关重要的;然而，两个孤立的大理石的成功合并是困难的，因为它们的机械鲁棒颗粒壳。在这项工作中，通过声悬浮实现了多个液体弹珠的聚结。利用高速摄像机对液弹的动态行为进行了监测。在声场的推动下，液体弹珠相互靠近，碰撞，最终凝聚成一个更大的弹珠。通过声场模拟和声辐射压计算，探讨了这一过程的机理。结果表明，压力梯度有利于液珠之间形成液桥，从而导致液珠的聚并。双液体弹珠的聚结诱导了初步的指示反应，这表明通过声悬浮可以用孤立的液体弹珠中包含的多种试剂成功触发预期的化学反应。
Liquid marbles show promising potential for application in the microreactor field. Control of the coalescence between two or among multiple liquid marbles is critical; however, the successful merging of two isolated marbles is difficult because of their mechanically robust particle shells. In this work, the coalescence of multiple liquid marbles was achieved via acoustic levitation. The dynamic behaviors of the liquid marbles were monitored by a high-speed camera. Driven by the sound field, the liquid marbles moved toward each other, collided, and eventually coalesced into a larger single marble. The underlying mechanisms of this process were probed via sound field simulation and acoustic radiation pressure calculation. The results indicated that the pressure gradient on the liquid marble surface favors the formation of a liquid bridge between the liquid marbles, resulting in their coalescence. A preliminary indicator reaction was induced by the coalescence of dual liquid marbles, which suggests that expected chemical reactions can be successfully triggered with multiple reagents contained in isolated liquid marbles via acoustic levitation.