Dynamical regulation to unidirectional wetting has received considerable attention in recent years due to its important role in flexible electronics, microfluidics, drug transportation, and so forth. It is of great significance to prepare a surface which allows the droplet to spread directionally on it with the length of droplet reversibly fluctuated within a broad range under external stimulation. In this paper, a double‐gradient wrinkled structure is prepared by constructing the structure‐gradient pillar arrays on a mechanics‐adjusted wrinkled surface and subsequently making chemical gradient by oxygen plasma treatment. Under the synergistic effect of the structural gradient, chemical gradient, and wrinkled structure, the droplet can undergo unidirectional spreading and realize dynamic regulation of the spreading length on the flexible structure. This will provide a propagable method for the regulation of surface wetting.

中文翻译：

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机械力调节的双梯度起皱表面上液滴的大范围可逆方向性分布

近年来，由于单向润湿的动态调节在柔性电子，微流体，药物运输等方面的重要作用，因此受到了广泛的关注。制备表面的液滴具有重要意义，该表面允许液滴在外部刺激下在宽范围内可逆地波动的情况下在其上定向散布。在本文中，通过在经过机械调整的起皱表面上构造结构梯度柱阵列，然后通过氧等离子体处理进行化学梯度制备了一种双梯度起皱结构。在结构梯度，化学梯度和起皱结构的协同作用下，液滴可以进行单向扩展，并在柔性结构上实现扩展长度的动态调节。