Schnell Georg, Polley Christian, Bartling Stephan, Seitz Hermann
Microfluidics, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig Weg 6, 18059 Rostock, Germany.
Leibniz Institute for Catalysis, Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
Nanomaterials (Basel). 2020 Jun 26;10(6):1241. doi: 10.3390/nano10061241.
The effect of chemical solvents on the wetting state of laser-structured surfaces over time is systematically examined in this paper. By using a 300-fs laser, nanostructures were generated on Ti6Al4V, subsequently cleaned in an ultrasonic bath with different solvents and stored in ambient air. The static contact angle showed significant differences for cleaning with various solvents, which, depending on the applied cleaning and time, amounted up to 100°. X-ray photoelectron spectroscopy analyses reveal that the cleaning of the laser-structured surfaces affects the surface chemistry and the aging behavior of the surfaces, even with highly volatile solvents. The effect of the chemical surface modification is particularly noticeable when using alcohols for cleaning, which, due to their OH groups, cause highly hydrophilic behavior of the surface after one day of storage. Over the course of 14 days, enrichment with organic groups from the atmosphere occurs on the surface, which leads to poorer wetting on almost every structured surface. In contrast, the cleaning in hexane leads to a fast saturation of the surface with long-chain carbon groups and thus to a time-independent hydrophobic behavior.
本文系统地研究了化学溶剂对激光结构化表面随时间变化的润湿状态的影响。通过使用300飞秒激光，在Ti6Al4V上生成纳米结构，随后在超声浴中用不同溶剂清洗，并在环境空气中储存。静态接触角在使用各种溶剂清洗时显示出显著差异，根据所应用的清洗方式和时间，差异可达100°。X射线光电子能谱分析表明，即使使用高挥发性溶剂，激光结构化表面的清洗也会影响表面化学性质和表面的老化行为。当使用醇类进行清洗时，化学表面改性的效果尤为明显，由于其羟基，在储存一天后表面会表现出高度亲水性。在14天的过程中，表面会从大气中富集有机基团，这导致几乎每个结构化表面的润湿性变差。相比之下，在己烷中清洗会使表面迅速被长链碳基团饱和，从而导致与时间无关的疏水行为。
