Chinese Journal of Lasers, Volume. 46, Issue 11, 1102012(2019)
Preparation of Pump-Free Transport Trajectory on Infiltration Controllable Surface Using Ultrafast Laser
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.
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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
Category: laser manufacturing
Received: May. 31, 2019
Accepted: Jul. 22, 2019
Published Online: Nov. 9, 2019
The Author Email: Liu Dun (dun.liu@hbut.edu.cn)