Jang Mu-Yeon, Kim Chan-Jung, Park Jeong-Woo, Baek Seung-Yub, Kim Tae-Wan
Department of Mechanical Engineering, Pukyong National University, Busan 48513, Korea.
Department of Mechanical Design Engineering, Pukyong National University, Busan 48513, Korea.
J Nanosci Nanotechnol. 2021 Sep 1;21(9):4968-4973. doi: 10.1166/jnn.2021.19265.
Most studies on hydrophobic surfaces processed by lasers rely on the use of pico- or femtosecond lasers. However, in industrial application, the fabrication methods using pico- or femtosecond lasers have the disadvantages of high cost and low efficiency In this study, we tried to fabricate hydrophobic surfaces using a high-power general-purpose diode laser. We have fabricated various micro/nano hierarchical structures for aluminum (Al5052) surface using laser groove processing technology. The surface of laser ablated micro structure is decorated with nano roughness, resulting in micro/nano hierarchical structure. Specimen with curved grooves are fabricated, and the correlation of wettability characteristics with spaces, widths, and curvature radii of grooves are presented. It was found that the higher contact angle was formed with a decrease of the curvature radius. We have also fabricated specimens with various micro-wavy surface pattern. The water droplets on the micro-wavy pattern kept the spherical shape with a high contact angle of 165 degrees or more.
大多数关于激光处理疏水表面的研究都依赖于皮秒或飞秒激光的使用。然而，在工业应用中，使用皮秒或飞秒激光的制造方法存在成本高和效率低的缺点。在本研究中，我们尝试使用高功率通用二极管激光器制造疏水表面。我们利用激光刻槽加工技术在铝（Al5052）表面制造了各种微/纳分级结构。激光烧蚀微观结构的表面装饰有纳米粗糙度，形成了微/纳分级结构。制备了具有弯曲沟槽的试样，并给出了润湿性特征与沟槽间距、宽度和曲率半径的相关性。结果发现，随着曲率半径的减小，形成了更高的接触角。我们还制备了具有各种微波纹表面图案的试样。微波纹图案上的水滴保持球形，接触角高达165度或更高。
