中国激光, 2019, 46 (11): 1102012, 网络出版: 2019-11-09
基于超快激光的浸润性可控表面无泵运输轨迹制备 下载: 1132次
Preparation of Pump-Free Transport Trajectory on Infiltration Controllable Surface Using Ultrafast Laser
激光技术 1050铝板 可控浸润性 表面粘附力 无泵运输 laser technique 1050 aluminum plate controllable wettability surface adhesion pump-free transport
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。
Abstract
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.
成健, 曹佳丽, 张恒超, 吴颖, 郑重, 刘顿. 基于超快激光的浸润性可控表面无泵运输轨迹制备[J]. 中国激光, 2019, 46(11): 1102012. Jian Cheng, Jiali Cao, Hengchao Zhang, Ying Wu, Zhong Zheng, Dun Liu. Preparation of Pump-Free Transport Trajectory on Infiltration Controllable Surface Using Ultrafast Laser[J]. Chinese Journal of Lasers, 2019, 46(11): 1102012.