| 초록 |
To control the droplet motion, Marangoni flow is a promising option for propulsion. Herein, we introduce a non-contact light-driven droplet manipulation method by using photothermally active droplets. The Marangoni flow, a surface shear flow, is occurred by localized photothermal heating via near-infrared (NIR) irradiation that results in an internal flow to drive the droplets. This movement is precisely controlled by changing the irradiation position of laser. In addition, we demonstrate the movements of two components mixture droplets, induced by a combination effect of temperature and composition gradients of mixture solution on Marangoni flow. This unexplored study proposes a novel view to manipulate the complex component mixture droplets. Moreover, we manipulate even spherical droplets having small contact area on conventional liquid repellent surfaces by rolling. We believe this unique droplet manipulation method provide a general way of droplet transportation on solid surfaces. |
