ABSTRACT

In this study, self-organised microspiked surface structures were fabricated with a picosecond laser source on austenite stainless steel. The laser-processed surface structures were subjected to low-temperature annealing for chemical modification to reduce the surface free energy of the metal oxides formed due to laser processing. The low-temperature treatment accelerates the adsorption of organic contamination, leading to the formation of ultralow water adhesion surface in few hours compared to the prolonged ageing process. The effect of the number of pulses/spot (PPS) and fluence with respect to the geometrical shape and its impact on wetting behaviour has been systematically investigated. The density of the nanoscale protrusions and the overlay of spongy porous nanoscale structures were influenced by the number of PPS and applied energy density. The multi-scale structures generated with a fluence of 1.3 J/cm² showed superhydrophobic character with a high contact angle about 158 ± 3° and low contact angle hysteresis <5°.

摘要

在这项研究中，使用皮秒激光源在奥氏体不锈钢上制造了自组织微尖峰表面结构。对激光加工的表面结构进行低温退火进行化学改性，以降低激光加工形成的金属氧化物的表面自由能。与长时间的老化过程相比，低温处理加速了有机污染物的吸附，导致在几小时内形成超低水粘附表面。已经系统地研究了脉冲数/点 (PPS) 和注量对几何形状的影响及其对润湿行为的影响。纳米级突起的密度和海绵状多孔纳米级结构的覆盖受 PPS 数量和施加的能量密度的影响。^图2显示出超疏水特性，具有约158±3°的高接触角和<5°的低接触角滞后。