基于超快激光的浸润性可控表面无泵运输轨迹制备  

Preparation of Pump-Free Transport Trajectory on Infiltration Controllable Surface Using Ultrafast Laser

作　　者：成健 曹佳丽 张恒超 吴颖[1] 郑重[1] 刘顿[1,2] Cheng Jian;Cao Jiali;Zhang Hengchao;Wu Ying;Zheng Zhong;Liu Dun(School of Mechanical Engineering,Hubei University of Technology,Wuhan,Hubei 430068,China;Sino-UK Joint Ultrafast Laser Processing Research Center,Hubei University of Technology,Wuhan,Hubei 430068,China)

机构地区：[1]湖北工业大学机械工程学院,湖北武汉430068 [2]湖北工业大学中英联合超快激光加工研究中心,湖北武汉430068

出　　处：《中国激光》2019年第11期168-177,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(51775176);湖北省教育厅项目(T201405);湖北工业大学2019年度博士科研启动基金(BSQD2019001);航空科学基金(201818X5002)

摘　　要：为实现基于超快激光铝板浸润性梯度轨迹上的液滴无泵运输,进一步提高液滴运动速度,利用纳秒激光器在1050铝板上制备出超疏水表面,再通过飞秒激光器在超疏水表面制备出楔形超亲水轨迹。采用接触角测量仪、电子扫描显微镜和傅里叶红外光谱仪测量样品表面的浸润性、表面形貌和化学成分,通过高速摄像机记录液滴在水平面和30°斜面上的运动情况。结果表明:通过激光方法可在铝板上制备出浸润性循环转变的表面,接触角由0°变为164.6°,再由164.6°变为0°;随着超亲水轨迹楔角α由4°变为10°,液滴的最大速度由300 mm/s变为500 mm/s;随着样品的加热环境由空气变为真空,样品滚动角由大于30°降为3.04°,液滴的平均速度由50 mm/s变为100 mm/s。增大轨迹楔角或降低超疏水表面黏附力,都可以有效提高液滴在浸润性梯度轨迹上的运动速度。This study aims to achieve pump-free transport of droplets along an infiltrating gradient trajectory on an aluminum plate by using ultrafast lasers and further increase the speed of the droplet movement. First, a superhydrophobic surface is prepared on a 1050 aluminum plate by using a nanosecond laser. Then, a wedge-shaped superhydrophilic trajectory is prepared on this superhydrophobic surface by using a femtosecond laser. The wettability, surface topography, and chemical composition of the sample surface are measured by using a contact angle measuring instrument, an electron scanning microscope, and a Fourier infrared spectrometer, respectively. The movement of droplets on the horizontal plane and the plane with a slope of 30° is recorded by using a high-speed camera. Results show that a surface with wettability-recycling property could be prepared on an aluminum plate by using a laser method. The contact angle could change from 0° to 164.6° and then from 164.6° to 0°. The hyper hydrophilic trajectory wedge angle changes from 4° to 10°, whereas the maximum droplet velocity changes from 300 to 500 mm/s. The sample heating environment changes from air to vacuum, sample rolling angle reduces from above 30° to 3.04°, and average droplet velocity changes from 50 to 100 mm/s. Therefore, it can be concluded that increasing the trajectory wedge angle or reducing the adhesion of the superhydrophobic surface can effectively improve the movement speed of droplets along the wettability gradient trajectory.

关 键 词：激光技术 1050铝板 可控浸润性 表面粘附力 无泵运输 

分 类 号：TN249[电子电信—物理电子学]