Nanosecond laser-based high-throughput surface nanostructuring (nHSN)
Nanosecond laser-based high-throughput surface nanostructuring (nHSN)
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DOI：
10.1016/j.apsusc.2019.145136
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发表时间：
2020-03-30
影响因子：
6.7
通讯作者：
Ding, Hongtao
中科院分区：
文献类型：
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作者：
Wang, Qinghua;Samanta, Avik;Ding, Hongtao
我们提出了一种新的纳秒激光为基础的高通量表面纳米结构（nHSN）的过程中，可以同时创建随机的纳米结构，并在大面积的金属合金表面获得理想的表面化学。nHSN由两个连续步骤组成：（1）纳秒激光纹理化（NLT）和（2）化学浸渍处理（CIT）。水约束中的NLT步骤（wNLT）不产生拓扑图案，但在化学和机械上预处理金属表面。我们的分析表明，表面纳米结构的结果从化学蚀刻和连接的功能基团在CIT阶段的nHSN的综合作用。可以为CIT阶段选择适当的硅烷试剂以实现所需的表面润湿行为，同时还可以在NLT阶段期间调整激光参数以微调纳米结构化机制。具有氟硅烷化学性质的nHSN纳米结构排斥水，而具有氰基硅烷化学性质的nHSN纳米结构吸引水。对包括铝、钢和钛合金在内的多种工程金属合金的极端润湿性（包括超疏水性和超亲水性）进行了评估。与现有的基于超短激光的表面纹理化方法相比，nHSN激光扫描时间显著提高了加工效率，并实现了工程合金大面积加工的实际生产量。
We present a novel nanosecond laser-based high-throughput surface nanostructuring (nHSN) process that can simultaneously create random nanostructures and attain desirable surface chemistry over large-area metal alloy surfaces. nHSN consists of two sequential steps: (1) nanosecond laser texturing (NLT) and (2) chemical immersion treatment (CIT). NLT step in water confinement (wNLT) does not generate topological patterns but preconditions the metal surface chemically and mechanically. Our analysis shows that surface nanostructuring results from a combined effect of chemical etching and attachment of functional groups during the CIT phase of nHSN. A proper silane reagent can be selected for the CIT phase to achieve the desired surface wetting behavior, while laser parameters can also be adjusted during the NLT phase to finely tune the nanostructuring mechanism. nHSN nanostructures with fluorosilane chemistry repel water, while those with cyanosilane chemistry attract water. Extreme wettability including superhydrophobicity and superhydrophilicity is assessed for multiple engineering metal alloys including aluminum, steel and titanium alloys. Compared with existing ultrashort laser-based surface-texturing methods, the nHSN laser scan time represents a significant improvement in processing efficiency and enables a practical throughput for large-area processing of engineering alloys.