Driving Droplets on Liquid Repellent Surfaces via Light-Driven Marangoni Propulsion,Advanced Functional Materials

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Driving Droplets on Liquid Repellent Surfaces via Light-Driven Marangoni Propulsion
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-01-04 , DOI: 10.1002/adfm.202111311
Hyesun Hwang ₁ , Periklis Papadopoulos _{2,

3} , Syuji Fujii ₄ , Sanghyuk Wooh ₁

Affiliation

Marangoni flow, a surface shear flow, is a promising option for propulsion when controlling liquid droplet motion on solid substrates. However, the applicability of Marangoni flow induced by heating the substrate for droplet manipulation is limited by low precision of motion control and a narrow range of substrate types. Herein, a novel noncontact light-driven droplet manipulation method by using photothermally active droplets is introduced. Marangoni flow is induced by local photothermal heating via near-infrared (NIR) irradiation resulting in an internal flow that drives the droplets. The photothermally active droplets slide away from the NIR light and the direction of motion can be precisely controlled by changing the irradiation position remotely. In addition, it is demonstrated that the addition of a miscible liquid to the droplets can reverse the direction of motion. Moreover, the authors show that spherical droplets on conventional liquid repellent surfaces move through a rolling mechanism instead of sliding. It is believed that this droplet manipulation method can provide a general way of droplet transportation on solid surfaces.

中文翻译：

通过光驱动 Marangoni 推进器在液体排斥表面上驱动液滴

在控制固体基材上的液滴运动时，Marangoni 流是一种表面剪切流，是一种很有前途的推进选择。然而，通过加热基板以进行液滴操作的 Marangoni 流动的适用性受到运动控制精度低和基板类型范围窄的限制。本文介绍了一种使用光热活性液滴的新型非接触光驱动液滴操作方法。Marangoni 流动是通过近红外 (NIR) 辐射的局部光热加热引起的，从而产生驱动液滴的内部流动。光热活性液滴从近红外光中滑开，可以通过远程改变照射位置来精确控制运动方向。此外，结果表明，向液滴中添加可混溶的液体可以反转运动方向。此外，作者表明，传统液体排斥表面上的球形液滴通过滚动机制而不是滑动移动。相信这种液滴操作方法可以提供一种在固体表面上运输液滴的通用方式。

更新日期：2022-01-04

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