Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, China.
State Key Laboratory of Precision Manufacturing for Extreme Service Performance, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
Nano Lett. 2023 Jun 14;23(11):4947-4955. doi: 10.1021/acs.nanolett.3c00759. Epub 2023 May 31.
Droplet steering has important applications in biomedical detection, local chemical reactions, liquid collection, and microfluidic control. Presently, droplet steering methods typically require specific paths and can be challenging to operate, involving complex fabrications for the operating systems. Here, we show a magnetically actuated superhydrophilic robot sphere (MSR) based on femtosecond laser direct writing technology for droplet steering. Through femtosecond laser treatment, uniform micro-/nanostructures are constructed on the surface of a MSR. Additionally, the contactless magnetic actuator makes it possible to remotely steer the MSR to transport droplets. After preliminary exploration of the mechanism by which MSR drives the droplet movement, the ability of MSR to control the droplet movement was systematically tested and analyzed. Moreover, the applications of the MSR in complex path liquid collection and transport, three-dimensional space transport, self-cleaning, etc., are further verified. This strategy provides a novel and reliable path for droplet manipulation and broadens its application.
液滴操控在生物医学检测、局部化学反应、液体收集和微流控等领域具有重要应用。目前，液滴操控方法通常需要特定的路径，并且操作起来具有挑战性，需要对操作系统进行复杂的制作。在这里，我们展示了一种基于飞秒激光直写技术的磁驱动超亲水机器人球（MSR）用于液滴操控。通过飞秒激光处理，在 MSR 的表面构建了均匀的微/纳米结构。此外，非接触式磁驱动器使得能够远程操控 MSR 以运输液滴。在初步探索了 MSR 驱动液滴运动的机制之后，系统地测试和分析了 MSR 控制液滴运动的能力。此外，还进一步验证了 MSR 在复杂路径液体收集和输送、三维空间输送、自清洁等方面的应用。该策略为液滴操控提供了一种新颖可靠的途径，拓宽了其应用范围。
