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    Durable and Superhydrophobic Aluminium Alloy with Microscale Hierarchical Structures and Anti-Drag Function Inspired by Diving Bell Spider

    Year: 2021

    Journal: Coatings, Volume 11, OCT

    Authors: Chen, You; Quan, Zijing; Sun, Yuhan; Chi, Deqiang; Liu, Delei; Zhou, Liang; Zhang, Junqiu; Mu, Zhengzhi; Wang, Ze; Li, Bo; Niu, Shichao; Han, Zhiwu; Ren, Luquan

    Organizations: National Key Research and Development Program of China [2018YFA0703300]; Foundation for Innovative Research Groups of the National Natural Science Foundation of China [52021003]; National Natural Science Foundation of China [51835006, 51875244, U19A20103, 52105301, 52105298]; Jilin University Science and Technology Innovative Research Team [2020TD-03]; Natural Science Foundation of Jilin Province [20200201232JC]; China Postdoctoral Science Foundation [2021TQ0121, 2021M691205, 2020M670844]; National Postdoctoral Program for Innovative Talents [BX20190139]; Graduate Student Innovation Fund of Jilin University [2016020]; Interdisciplinary Research Funding Scheme of Jilin University [101832020DJX050]; Open Innovation Project of the 55th Research Institute of NORINCO GROUP; Joint Fund for Independent Innovation of Future Laboratory of the 2nd Research Institute of CASIC

    Keywords: bio-inspired; diving bell spider; superhydrophobic aluminium alloy; physicochemical durability; anti-drag function

    Coating materials with special surface wettability are widely applied in marine paint systems used in the naval industry to reduce the corrosion and viscous drag of seawater. However, traditional coatings are inefficient and limited, either by poor durability or insufficient anti-drag capacity. Here, inspired by the diving bell spider, a bionic superhydrophobic coating with multiscale hierarchical architecture was successfully prepared on the surface of aluminium alloy. It possesses excellent mechanical abrasion durability, chemical durability, and low adhesion. Remarkably, the water contact angles could remain over 150.9 degrees after more than 15 abrasion cycles or strong acid/alkali conditions. In addition, the impacting water droplet lifted off the surface of bionic superhydrophobic aluminium alloy (BSAA) within 13 ms, illustrating an excellent low adhesion property. In fact, when the BSAA is immersed in water, it could absorb bubbles and form a gas membrane. The existence of the gas membrane could prevent water and anaerobic organisms from contacting and even corroding the BSAA. Meanwhile, the gas membrane acts as a lubricant and significantly deceases friction at the solid-liquid interface, reducing the drag for BSAA. The BSAA proposed in this work has broad application prospects, such as medical devices, microfluidic chips, gas separation and collection in water.
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