Tan Zhimin, Mao Xiaohui, Yang Shenglin, Zhao Yiping, Yang Lili, Ge Dengteng
State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Institute for Engineering and Technology (Shanghai), Xinxing Cathay International Group, Shanghai 201403, China.
Langmuir. 2025 May 20;41(19):12257-12263. doi: 10.1021/acs.langmuir.5c01068. Epub 2025 May 6.
Superhydrophobic (SH) surfaces have served as a key strategy to decrease flow resistance via gas-liquid interfaces in numerous fields such as pipeline transportation, microfluidics, the shipping industry, and so forth. However, an underwater SH surface with both good drag reduction and plastron restoration from a fully wetted state remains challenging. Inspired by the hairy structure of water spiders, herein, an underwater respirable skin (URS) with a microcone-nanoparticle structure is demonstrated. URS with different geometric parameters is achieved through laser microfabrication and chemical vapor deposition. The plastron can be completely restored from the fully wetted state after 11.6 s of air jetting, and a drag reduction rate of 15.7% ± 0.2% can be achieved. The theoretical and numerical results reveal a contradictory effect between drag reduction and plastron restoration. Our study suggests promising comprehensive perspectives for marine vehicle coatings and methodologies for sustainable drag reduction surfaces, considering both plastron restoration and the drag reduction rate.
超疏水（SH）表面已成为众多领域（如管道运输、微流体、航运业等）中通过气液界面降低流动阻力的关键策略。然而，要获得一种兼具良好减阻性能且能从完全浸湿状态恢复气膜的水下超疏水表面仍然具有挑战性。受水蜘蛛毛发结构的启发，本文展示了一种具有微锥 - 纳米颗粒结构的水下可呼吸皮肤（URS）。通过激光微加工和化学气相沉积实现了具有不同几何参数的URS。在喷气11.6秒后，气膜可从完全浸湿状态完全恢复，并且可实现15.7%±0.2%的减阻率。理论和数值结果揭示了减阻和气膜恢复之间的矛盾效应。考虑到气膜恢复和减阻率，我们的研究为船舶涂料以及可持续减阻表面的方法提供了有前景的综合视角。
