Anisotropic wetting of copper alloys induced by one-step laser micro-patterning
Anisotropic wetting of copper alloys induced by one-step laser micro-patterning
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DOI：
10.1016/j.apsusc.2012.09.071
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发表时间：
2012-12-15
影响因子：
6.7
通讯作者：
Muecklich, F.
中科院分区：
文献类型：
--
作者：
Hans, M.;Mueller, F.;Muecklich, F.
利用激光干涉表面结构技术(LISS)对铜合金(CuSn8，CuZn23Al3Co)进行了线状几何形状的微图案化。在目前的研究中，两个高功率脉冲激光被重新组合以产生独特的线状强度分布，在不同的激光流度下具有选择的恒定周期为10微米。通过液滴形状分析和静态接触角测量，证实了这些表面上的各向异性润湿特性，这些接触角与结构平行和垂直，接触角相差25%。用白光干涉法、空间频率分布、原子力显微镜和X射线光电子能谱对剪裁线结构的形貌和化学结构进行了表征和分析。表面形状和均匀性被认为是各向异性润湿设计的关键参数，但得出的结论是，表面结构的几何和局部化学成分的变化都是导致这一现象的原因。平行毛细效应和垂直接触线钉扎是控制机制。(C)2012爱思唯尔B.V.保留所有权利。
Copper alloys (CuSn8, CuZn23Al3Co) have been micro-patterned with line-like geometries by Laser Interference Surface Structuring (LISS). In the presented study two high power pulsed laser beams are recombined to create unique, line-like intensity distributions with a chosen, constant periodicity of 10 mu m at varying laser fluencies. Anisotropic wetting properties on these surfaces have been confirmed by drop shape analysis and static contact angle measurements, which were conducted parallel and perpendicular to the structures revealing up to 25% difference in contact angle. The topography and chemistry of the tailored line structures have been characterized and analyzed by white light interferometry, spatial frequency distribution, AFM and X-ray photoelectron spectroscopy. The topographic shape and homogeneity are considered as key parameters for anisotropic wetting design, although it is concluded that both, the geometry as well as the locally varying chemical composition of the surface structures contribute to the phenomenon. Parallel capillarity effects and perpendicular contact line pinning are found to be the governing mechanisms. (C) 2012 Elsevier B. V. All rights reserved.