Pinning/sliding behaviors and underlying mechanism of water droplets on ultra-slippery surfaces under temperature and force fields stimuli
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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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Key words:
- femtosecond laser /
- stimuli-response /
- ultra-lubricated surface /
- droplet manipulation /
- microfluidics
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图 1 双重响应超润滑表面 (DRSS)制备原理(a)及液滴操控行为(b)
PDMS—Polydimethylsiloxane
Figure 1. Schematic fabrication of dual-responsive slippery surface (DRSS) (a) and its droplet control behaviors (b)
图 2 不同放大倍数下DRSS表面的微沟槽结构扫描电镜图像
Figure 2. SEM images of the microgroove structures on the DRSS at different magnification
图 3 (a)室温和低温之间DRSS表面的液滴临界滑动体积；润滑油注入量(b)、沟槽深度(c)和间距(d)等不同实验参数下DRSS表面液滴滑动/钉住行为的临界滑动体积
Figure 3. (a) Comparison of critical sliding volume between room temperature (25℃) and low temperature (−20.5℃); Critical sliding volume for sliding/pinning behavior of droplet on stretchable DRSS in diverse experimental parameters including lubricant infusion amount (b), microgroove depth (c) and spacing (d)
ε—Stretching multiple
图 4 室温(a)和低温(b)下DRSS表面液滴滑动和固定行为示意图及受力分析
Figure 4. Schematics and force analysis of droplet sliding and pinning behaviors on the DRSS at room temperature (25℃) (a) and low temperature (−20.5℃) (b)
α—Tilt angle of DRSS; θb—Receding angle; θa—Advancing angle; R—Droplet base radius; m—Droplet mass; g—Gravity acceleration; G—Gravity of droplet; Ff—Friction force; Fs—Support force; Fdriven—Driving force; H—Meniscus height; h—Oil film thickness; Ff*—Friction force
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