Zhang Yiyuan, Jiao Yunlong, Chen Chao, Zhu Suwan, Li Chuanzong, Li Jiawen, Hu Yanlei, Wu Dong, Chu Jiaru
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation , University of Science and Technology of China , Hefei 230026 , China.
School of Instrument Science and Opto-electronics Engineering , Hefei University of Technology , Hefei 230009 , China.
Langmuir. 2019 Aug 13;35(32):10625-10630. doi: 10.1021/acs.langmuir.9b01035. Epub 2019 Jul 23.
Dynamically responsive liquid-infused interfacial materials have broad technological implications in manipulating droplet motions. However, present works are mainly about reversible tuning of the isotropic slippery surface; the reversible switching between isotropic and anisotropic sliding has not been deeply explored. Here, we report a kind of liquid-infused elastic-grooved surface (LIEGS) by femtosecond laser ablation and realize reversible switching between isotropic and anisotropic sliding by one-direction mechanical stretching. Under mechanical stretching and strain release, droplet motion can be reversibly switched between the sliding and pinned states along the perpendicular direction to the grooves, whereas the droplet keeps sliding along the parallel direction to the grooves. The mechanism of reversible switching mainly contributes to the decrease of film thickness during the stretching process in which the film thickness decreases from 13 to 4 μm with the increase of the strain from 0 to 60%. Finally, we demonstrate the real-time flexible control over a droplet sliding/pinned on the strain-changing LIEGS.
动态响应的注液界面材料在操控液滴运动方面具有广泛的技术应用前景。然而，目前的研究主要集中在各向同性光滑表面的可逆调控；各向同性和各向异性滑动之间的可逆切换尚未得到深入探索。在此，我们通过飞秒激光烧蚀制备了一种注液弹性沟槽表面（LIEGS），并通过单向机械拉伸实现了各向同性和各向异性滑动之间的可逆切换。在机械拉伸和应变释放过程中，液滴运动可以在垂直于沟槽的方向上在滑动和固定状态之间可逆切换，而液滴在平行于沟槽的方向上则持续滑动。可逆切换的机制主要归因于拉伸过程中膜厚度的减小，在此过程中，随着应变从0增加到60%，膜厚度从13μm减小到4μm。最后，我们展示了对在应变变化的LIEGS上滑动/固定的液滴的实时灵活控制。
