Ultrafast Self-Healing Superhydrophobic Surface for Underwater Drag Reduction.
Ultrafast Self-Healing Superhydrophobic Surface for Underwater Drag Reduction.
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DOI：
10.1021/acs.langmuir.2c01566
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Pengfei Sun;Xiaoming Feng;Guizhong Tian;Xiaowei Zhang;Jiahui Chu
中科院分区：
文献类型：
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作者：
Pengfei Sun;Xiaoming Feng;Guizhong Tian;Xiaowei Zhang;Jiahui Chu
自修复超疏水表面因其无需制备工艺即可恢复超疏水性而引起人们的极大兴趣。然而，自修复超疏水表面仍然面临修复时间长的困境。特别是在水性环境中，超疏水表面非常容易受到污染和损坏。本研究开发了一种具有超快速修复能力的超疏水表面，用于水介质中的减阻。所制备的超疏水表面在遭受严重的物理和化学损伤后，仅需30 s即可恢复超疏水性。此外，这项研究开创了超疏水性和多孔结构相结合的水下减阻。减阻研究证实，超疏水表面在水中可使摩擦阻力降低约43%。然而，由于空气层的稳定性增加，具有多孔结构的超疏水表面的减阻率可以提高到76%。更重要的是，通过对水下空气层的进一步实验，平均孔径为50 μm的多孔结构具有最优异的稳定性。这归因于孔的适当尺寸，以有效地平衡毛细力并抵抗边缘区域中的润湿。该研究将为超疏水表面的大规模应用和长期减阻带来启示。
The self-healing superhydrophobic surfaces have attracted great interest owing to restoring superhydrophobicity without preparation crafts. However, the self-healing superhydrophobic surface still faces the dilemma of long repairing time. Especially in aqueous environments, superhydrophobic surfaces are highly susceptible to contamination and damage. In the current study, a superhydrophobic surface with ultrafast repairability was developed, which apply for drag reduction in aqueous medium. The prepared superhydrophobic surface can recover superhydrophobicity in only 30 s after severe physical and chemical damage. In addition, this research pioneered the combination of superhydrophobicity and porous structures for underwater drag reduction. The study of drag reduction confirms that the superhydrophobic surface can reduce the frictional drag by about 43% in the water. However, the drag reduction rate of the superhydrophobic surface with the porous structure can be improved to 76% due to increased stability of the air layer. More importantly, the porous structure with the average pore size of 50 μm has the most excellent stability through further experiments on the underwater air layer. This is attributed to the proper size of the pore to effectively balance the capillary force and resist wetting in the marginal region. This study will bring inspiration for the large-scale application of superhydrophobic surfaces and long-term drag reduction.