Milles Stephan, Dahms Johannes, Soldera Marcos, Lasagni Andrés F
Institut für Fertigungstechnik, Technische Universität Dresden, George-Bähr-Str. 3c, 01069 Dresden, Germany.
PROBIEN-CONICET, Dto. de Electrotecnia, Universidad Nacional del Comahue, Neuquén 8300, Argentina.
Materials (Basel). 2021 Jan 2;14(1):184. doi: 10.3390/ma14010184.
Laser-microtextured surfaces have gained an increasing interest due to their enormous spectrum of applications and industrial scalability. Direct laser interference patterning (DLIP) and the well-established direct laser writing (DLW) methods are suitable as a powerful combination for the fabrication of single (DLW or DLIP) and multi-scale (DLW+DLIP) textures. In this work, four-beam DLIP and DLW were used independently and combined to produce functional textures on aluminum. The influence of the laser processing parameters, such as the applied laser fluence and the number of pulses, on the resulting topography was analyzed by confocal microscopy and scanning electron microscopy. The static long-term and dynamic wettability characteristics of the laser-textured surfaces were determined through water contact angle and hysteresis measurements, revealing superhydrophobic properties with static contact angles up to 163° and hysteresis as low as 9°. The classical Cassie-Baxter and Wenzel models were applied, permitting a deeper understanding of the observed wetting behaviors. Finally, mechanical stability tests revealed that the DLW elements in the multi-scale structure protects the smaller DLIP features under tribological conditions.
激光微纹理表面因其广泛的应用范围和工业可扩展性而越来越受到关注。直接激光干涉图案化（DLIP）和成熟的直接激光写入（DLW）方法作为制造单一（DLW或DLIP）和多尺度（DLW + DLIP）纹理的强大组合是合适的。在这项工作中，四光束DLIP和DLW被单独使用并结合起来在铝上制造功能性纹理。通过共聚焦显微镜和扫描电子显微镜分析了激光加工参数，如施加的激光能量密度和脉冲数，对所得形貌的影响。通过水接触角和滞后测量确定了激光纹理表面的静态长期和动态润湿性特征，揭示了超疏水性能，静态接触角高达163°，滞后低至9°。应用了经典的Cassie-Baxter和Wenzel模型，从而更深入地理解了观察到的润湿行为。最后，机械稳定性测试表明，多尺度结构中的DLW元素在摩擦学条件下保护较小的DLIP特征。
