Nanosecond laser textured superhydrophobic metallic surfaces and their chemical sensing applications
Nanosecond laser textured superhydrophobic metallic surfaces and their chemical sensing applications
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DOI：
10.1016/j.apsusc.2015.09.027
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发表时间：
2015-12-01
影响因子：
6.7
通讯作者：
Shephard, Jonathan D.
中科院分区：
文献类型：
--
作者：
Ta, Duong V.;Dunn, Andrew;Shephard, Jonathan D.
这项工作证明了纳秒激光图案化的铜和黄铜表面的超疏水行为。与以前用于这种纹理的超快激光系统相比，红外纳秒光纤激光器提供了一种更低的成本和更强大的系统，并具有更高的加工速率。当暴露于环境条件时，纹理化表面的润湿性随时间推移从亲水性发展为超疏水性。润湿性的变化归因于激光毛化过程中表面氧化物的部分脱氧。显示出高达152度的稳态接触角的纹理。接触角滞后约为3-4度。已经实现了。有趣的是，超疏水表面具有自清洁能力，并具有潜在的化学传感应用。这些新型化学传感器的原理是基于接触角随溶液中甲醇浓度的变化。为了证明这种传感器的工作原理，发现甲醇溶液在超疏水表面上的接触角随着浓度的增加而指数衰减。当甲醇含量达到28%时，观察到超疏水黄铜表面的接触角显著降低128度，比未处理表面的接触角（12度）大一个数量级。(C)2015作者由爱思唯尔公司出版
This work demonstrates superhydrophobic behavior on nanosecond laser patterned copper and brasssurfaces. Compared with ultrafast laser systems previously used for such texturing, infrared nanosecondfiber lasers offer a lower cost and more robust system combined with potentially much higher processing rates. The wettability of the textured surfaces develops from hydrophilicity to superhydrophobicity overtime when exposed to ambient conditions. The change in the wetting property is attributed to the partial deoxidation of oxides on the surface induced during laser texturing. Textures exhibiting steady state contact angles of up to similar to 152 degrees. with contact angle hysteresis of around 3-4 degrees. have been achieved. Interestingly, the superhydrobobic surfaces have the self-cleaning ability and have potential for chemical sensing applications. The principle of these novel chemical sensors is based on the change in contact angle with the concentration of methanol in a solution. To demonstrate the principle of operation of such a sensor, it is found that the contact angle of methanol solution on the superhydrophobic surfaces exponentially decays with increasing concentration. A significant reduction, of 128 degrees, in contact angle on superhydrophobic brass is observed, which is one order of magnitude greater than that for the untreated surface (12 degrees), when percent composition of methanol reaches to 28%. (C) 2015 The Authors. Published by Elsevier B.V.