中文摘要：

对水平和30°倾角放置梯度表面能材料表面上液滴运动特性进行了可视化实验，分析了液滴在梯度表面上运动速度的变化规律，以及液滴大小和表面倾角对运动速度变化的影响。实验结果表明：在梯度表面能材料上，液滴能获得较大睁宏观运动速度，并可以沿30°倾角放置的梯度表面材料上自下而上的运动；大液滴较小液滴的峰值运动速度大，运动距离更远；液滴在运动过程中出现蠕动的现象。

英文摘要：

The visual experiments were performed to study the movement characteristics of liquid droplets on horizontal and 30° inclined surface with gradient surface energy, respectively. The variation of droplet velocity on the gradient surface was analyzed, and the effects of the size of droplet and obliquity of surface were investigated. The experimental results show that the droplets can reach a comparatively high speed on the surface without other external force and can move upwards along the surface that was placed by 30° in inclination angle. The peak velocity of a larger liquid droplet is larger than that of the smaller one, and also the movement distance of a larger droplet is longer than that of the smaller one on the same surface. There exists a phenomenon of wiggly movement in the process of the droplet moving on the surface.