郭永刚,吕志,朱亚超.激光图案化铝合金表面的润湿性和各向异性研究[J].表面技术,2023,52(3):352-359, 369.
GUO Yong-gang,LYU Zhi,ZHU Ya-chao.Wettability and Anisotropy of Laser Patterned Aluminum Alloy Surfaces[J].Surface Technology,2023,52(3):352-359, 369
激光图案化铝合金表面的润湿性和各向异性研究
Wettability and Anisotropy of Laser Patterned Aluminum Alloy Surfaces
  
DOI:10.16490/j.cnki.issn.1001-3660.2023.03.033
中文关键词:  水滴  铝合金  超亲/超疏水  各向异性  激光加工
英文关键词:6061 aluminum  superhydrophilic/superhydrophobic  nanosecond laser etching  anisotropy
基金项目:国家自然科学基金(51775169);河南工业大学青年骨干教师培育计划(2018);河南工业大学创新基金支持计划专项资助(2020ZKCJ26);河南省科技攻关计划项目(222102220018);河南省留学人员科研择优资助经费
作者单位
郭永刚 河南工业大学 机电工程学院,郑州 450001;河南省碳纤维复合材料国际联合实验室,郑州 450001;汽车复合材料河南省工程实验室,郑州 450001 
吕志 河南工业大学 机电工程学院,郑州 450001 
朱亚超 河南工业大学 机电工程学院,郑州 450001 
AuthorInstitution
GUO Yong-gang School of Mechanical & Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China;Carbon Fiber Composites International Joint Research Lab in Henan, Henan University of Technology, Zhengzhou 450001, China;Henan Provincial Engineering Laboratory of Automotive Composite Materials, Henan University of Technology, Zhengzhou 450001, China 
LYU Zhi School of Mechanical & Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China 
ZHU Ya-chao School of Mechanical & Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China 
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中文摘要:
      目的 研究水滴在超亲/超疏水图案化铝合金表面润湿性、滚动阻力各向异性和定向运输特性。方法 采用激光刻蚀和氟硅烷修饰的方法,加工出具有微网格图案的超疏水6061铝合金表面。在超疏水铝合金表面再次激光刻蚀加工出长方形、平行四边形和圆形的超亲水微流体通道。研究了亲水沟槽宽度和深度对超亲/超疏水表面各向异性润湿和各向异性滚动的影响,分析了重力作用下水滴沿微流体通道的运动情况。利用SEM、三维轮廓仪观察铝合金表面形貌。利用接触角测量仪观测水滴与表面的接触角与滚动角大小。利用高速摄像机观察水滴的运动情况。结果 水滴在超亲/超疏水铝合金表面表现出明显的润湿性各向异性和滚动阻力各向异性。10 μL水滴在0.1 mm宽度的直线型沟槽上铺展,平行接触角θcp仅为93.9°;而垂直于线型沟槽方向,垂直接触角θcv却为152.6°。平行滚动角θrp为21.5°,而垂直滚动角θrv大于90°,水滴无法滚落。基于超亲/超疏水表面滚动阻力各向异性的特性,制备了依靠重力驱动实现微流体定向运输的铝合金表面。结论 亲水沟槽宽度对水滴在超亲/超疏水表面润湿性和滚动阻力各向异性的影响显著。激光刻蚀能够调控加工区域微结构、宏观形状和尺寸,可用于加工超亲/超疏水表面。超亲/超疏水表面可以依靠重力驱动实现微流体定向运输。
英文摘要:
      In this paper, a superhydrophobic 6061 aluminum alloy surface with a microgrid pattern was fabricated by nanosecond laser etching and subsequent modification of low-surface-energy fluorosilane. Then, rectangular, parallelogram and circular superhydrophilic microfluidic channels were fabricated by laser etching again on the surface of the superhydrophobic aluminum alloy. The anisotropic wetting and rolling resistance phenomena of rectangular microfluidic channels along the direction parallel and perpendicular to the grooves were analyzed. The effects of laser-etched groove width and depth on the anisotropic wetting and rolling of droplets on the surface of superhydrophilic/superhydrophobic patterned aluminum alloys were investigated. And the movement of droplets along microfluidic channels under the action of gravity was investigated. In order to explain the phenomenon of anisotropic wetting and anisotropic rolling of droplets on the contact surface more clearly, we innovatively defined the parallel contact angle θcp, vertical contact angle θcv, parallel rolling angle θrp and vertical rolling angle θrv in this paper, and evaluated the changing laws of anisotropic wetting and anisotropic rolling through their changing laws. Scanning electron microscopy(SEM)and three-dimensional profiler were used to observe the morphology of the aluminum alloy surface. The contact angle measurement instrument was employed to observe and measure the contact state and adhesion state of the droplets on the solid surface. The high-speed camera was applied to observe the specific situation of the water droplet movement on the surface. The experimental results showed that the droplets exhibited obvious contact anisotropy and rolling anisotropy on the surface of the superhydrophilic/superhydrophobic patterned aluminum alloy. And the droplets showed different contact states and different adhesion on the surfaces with different wettability, for example, 10 μL of water droplets spread on 0.1 mm wide linear grooves, and the parallel contact angle θcp was only 93.9°; while perpendicular to the direction of the linear groove, the vertical contact angle θcv was 152.6°. The parallel rolling angle θrp was 21.5°, while the vertical rolling angle θrv was greater than 90°, and the water droplets cannot roll off. Both the parallel contact angle θcp and the vertical contact angle θcv of water droplets decreased with the increase of the linear groove width, at the same time the contact angle anisotropy tended to increase. The vertical rolling angle θrv were greater than 90° and could not fall off, while the parallel rolling angle θrp decreased with the increase of the linear groove width, and it can be concluded that the rolling resistance anisotropy increased with the increase of the linear groove width. As linear groove depth increases, there was no significant change in wettability anisotropy and rolling resistance anisotropy. Based on the characteristics of rolling anisotropy, a kind of aluminum alloy surface with microfluidic directional transport by gravity was prepared successfully, which has good droplet anisotropy and lossless transmission performance. Nanosecond laser processing can control the microstructure, macroscopic shape and the size of the processing area, anisotropic superhydrophilic/superhydrophobic patterned surfaces can be processed easily combined with subsequent low surface energy modification technology. The method here has the advantages of low cost, simple process, and fast response, so it's suitable for the processing of hydrophilic patterns on superhydrophobic surfaces of various metal substrates. Therefore, it has potential applications in biopharmaceutical, high-throughput cell screening and droplet storage.
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