Femtosecond laser-induced non-centrosymmetric surface microstructures on bulk metallic glass for unidirectional droplet micro-displacement
Femtosecond laser-induced non-centrosymmetric surface microstructures on bulk metallic glass for unidirectional droplet micro-displacement
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DOI：
10.1088/1361-6463/ab5df7
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
Chen Li;Lijun Yang;Xuezhuang Ren;Yong Yang;G. Cheng
中科院分区：
文献类型：
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作者：
Chen Li;Lijun Yang;Xuezhuang Ren;Yong Yang;G. Cheng
无能量输入的单向液滴运动在各种潜在的应用中引起了人们的极大关注。报道了利用飞秒激光在大角度入射下制备非常规激光诱导的液滴单向微位移周期性表面结构。为了克服现有软材料如PDMS用于控制液滴的机械耐久性，采用锆基大块金属玻璃制备了典型的非中心对称非传统LIPSS，其中包括中心空间周期为400 nm的微米级椭圆弧形结构和纳米波纹。利用飞秒激光辐照技术，在Zr-BMG上制作了非常规LIPSS的光斑和光栅，构建了功能表面结构。利用功能表面结构实现了水滴在Zr-BMG上的单向微位移。为了更好地理解非常规LIPSS的制备过程，通过数值模拟揭示了非常规LIPSS的形成机理。这项工作提供了一种快速、精确、低成本地在金属材料上制备非中心对称表面微/纳米结构的方法，以实现液滴在微流体中的单向运动。
Unidirectional droplet motion without energy input has attracted considerable attention in various potential applications. We report on the fabrication of unconventional laser-induced periodic surface structures (LIPSS) for unidirectional droplet micro-displacement by a femtosecond laser at a large incident angle. In order to overcome the mechanical durability of the existing soft materials such as PDMS for controlling the droplet, Zr-based bulk metallic glass (Zr-BMG) is used to fabricate the typical non-centrosymmetric unconventional LIPSS, which include micro-sized elliptical arc-shaped structures and nano-ripples with the central spatial periodicity of 400 nm. The spots and the grating of unconventional LIPSS on Zr-BMG are fabricated to construct the functional surface structures by femtosecond laser irradiation. The unidirectional micro-displacement of water droplet on Zr-BMG was achieved using functional surface structures. For better understanding the fabrication of unconventional LIPSS, the underlying formation mechanism was revealed by numerical simulations. This work gives a fast, precise and low-cost method to fabricate the non-centrosymmetric surface micro/nano-structures on metal materials for unidirectional droplet motion in microfluidics.