Drops Sliding on Non-SLIPS Structures
Drops Sliding on Non-SLIPS Structures
复制标题
跌落在非 SLIPS 结构上滑动
DOI：
10.1021/acs.langmuir.1c01063
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Jing Guangyin
中科院分区：
文献类型：
--
作者：
Zhang Peixin;Liu Yanan;Liao Chunyan;Luo Hao;Jing Guangyin
受植物叶子的启发，充满液体的光滑多孔表面显示出诱人的非湿润和自清洁能力。然而，对注入液层的严格要求及其不可避免的损失限制了其实际应用。在这里，我们提出了一种模型结构，通过引入覆盖有不连续润滑膜的固体纳米结构来定义为无滑移。这种通过固体润湿性调整的防滑套实现了出色的自清洁功能，滑动角小，可与典型防滑套相媲美。通过略微增强固体纳米结构的疏水性，这个滑动角α*可以进一步减小到饱和平台。有趣的是，在给定的倾角下，所有这些非滑移样品的滑动速度几乎保持恒定，与固体润湿性无关。我们通过定义一个能量势垒来描述滑移机制，该势垒负责非滑移上的滑动起始。这种非滑移的能垒与分子在固体纳米结构上的吸附有定性的一致性。对该防滑材料的抗生物污染进行了确认，表明其具有良好的自洁能力。研究结果表明，即使在注入的油层逐渐耗尽的情况下，新表面也表现出自清洁性能的非退化。
Inspired by a plant leaf, a slippery liquid-infused porous surface (SLIPS) exhibits attractive nonwetting and self-cleaning abilities. However, rigorous requirements for the infused liquid layer and its inevitable loss limit its practical use. Here, we propose a model structure defined as a non-SLIPS by introducing solid nanostructures covered with a discontinuous lubricant film. This non-SLIPS tuned by solid wettability achieves the excellent self-cleaning feature with a small sliding angle comparable to the counterpart of a typical SLIPS. This sliding angle α* can be further reduced to a saturated plateau by a slight enhancement of hydrophobicity of the solid nanostructures. Interestingly, the sliding velocity remains almost constant for all of these non-SLIPS samples at a given tilt angle, independent of solid wettability. We formulate the slippery mechanism by defining an energy barrier responsible for the sliding initiation on the non-SLIPS. This energy barrier of the non-SLIPS is correlated, with a qualitative agreement, to the molecular adsorption on the solid nanostructures. The antibiological contamination is confirmed for this non-SLIPS, indicating its excellent self-cleaning ability. The findings suggest that the new surfaces, even with the gradual depletion of the infused oil layer, exhibit the nondegradation of the self-cleaning performance.