超润滑表面液滴在温度及力场作用下的钉扎/滑动行为及内在机制

Pinning/sliding behaviors and underlying mechanism of water droplets on ultra-slippery surfaces under temperature and force fields stimuli

  • 摘要: 近年来,刺激响应型液体注入式超润滑多孔表面(SLIPS)在微流体操控领域受到广泛关注。然而,大多数报道的刺激响应型SLIPS都是在室温或相对高温下实现液滴操控,难以满足更广泛的应用场景。本文利用飞秒激光正交扫描方法制备了一种双重响应超润滑表面(DRSS)。通过温度场和力场的共同作用,实现了微液滴在DRSS上滑动/钉扎行为的动态控制。系统研究了润滑油注入量、沟槽深度和间距等实验参数对液滴临界滑动体积的影响规律,揭示了液滴钉扎/滑动动力学机制。这种双物理场调控下的超润滑表面液滴操控方法有望用于芯片实验室、微流体反应器等相关领域。

     

    Abstract: In recent years, stimuli-responsive slippery liquid-infused porous surfaces (SLIPSs) have attracted widespread attention in the field of microfluidic manipulation. However, most reported responsive SLIPSs function under a single stimulus, which are challenging to satisfy the generalized application scenarios. Here, a kind of dual-responsive slippery surface (DRSS) is fabricated through femtosecond laser cross-scanning method. Relying on the synergic action of temperature and force field, the sliding/pinning behaviors of water droplets on DRSS can be dynamically controlled. The impact of diverse parameters on the critical sliding volume of droplets is systematically investigated, including lubricant infusion amount, groove depth and spacing. The dynamic mechanism of droplet sliding/pinning behaviors is revealed. This kind of DRSS could be used in the related fields such as lab-on-a-chip and microfluidic reactors.

     

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