利用铝片制备了不同高度、倾角由小到大连续变化的梯度锯齿表面，采用高速摄影技术对高温梯度锯齿表面自推进液滴的运动行为进行了探讨，并和常规锯齿进行了比较。结果发现：液滴可以在一定温度梯度锯齿表面发生由锯齿倾角小的方向往倾角大的方向的定向运动，并且运动的加速度和锯齿高度以及锯齿表面温度有关；随着锯齿高度的增加，液滴运动的平均加速度呈逐渐减小的趋势；而随着锯齿表面温度的增高，液滴的平均加速度则经历从减小到增大的两个阶段。

The gradient ratchet surfaces with different heights and varying inclination angles are fabricated with aluminum sheets.A high-speed camera is used to investigate the motion of self-propelled droplets on the gradient ratchet surfaces of high temperature,and the dynamic properties are compared with the normal ratchet surfaces.It is found that droplets can move along the direction from a small ratchet angle to a large ratchet angle.The acceleration of the movement is related to the height of the ratchet and the surface temperature.With the increase of the height of ratchets,the average acceleration of droplet movement gradually decreases.As the surface temperature increases,the average acceleration of droplets goes through two stages from decreasing to increasing.Mechanics and wetting kinetics are used to analyze the mechanism of movement and its influencing factors.

O35

国家自然科学基金（51776128,51176123）