Bioinspired Pressure-Tolerant Asymmetric Slippery Surface for Continuous Self-Transport of Gas Bubbles in Aqueous Environment.
Bioinspired Pressure-Tolerant Asymmetric Slippery Surface for Continuous Self-Transport of Gas Bubbles in Aqueous Environment.
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DOI：
10.1021/acsnano.8b00192
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发表时间：
2018-01
期刊：
影响因子：
17.1
通讯作者：
Chunhui Zhang;Bo Zhang;Hongyu Ma;Zhe Li;Xiao Xiao-Xiao;Yuheng Zhang;Xinyu Cui;Cunming Yu;
中科院分区：
文献类型：
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作者：
Chunhui Zhang;Bo Zhang;Hongyu Ma;Zhe Li;Xiao Xiao-Xiao;Yuheng Zhang;Xinyu Cui;Cunming Yu;
具有几何梯度结构或特殊润湿性的生物表面在操纵多功能流体的行为方面表现出有趣的性能。通过模仿自然物种，即，仙人掌脊柱的形状梯度形态和Picher植物的润滑内表面，我们已经成功地制备了一个不对称的光滑表面，通过以下过程的CO2激光切割，超疏水改性，和fluorinert输液。气泡的非对称形态会导致气泡变形，从而对气泡产生非对称的驱动力。由于注入了具有低表面能（1016 mN/m，25 °C）和易流动性（100.75 cP，25 °C）的氟惰性物，光滑表面表现出高粘附力（10300 μN），但对气泡的摩擦力低。在非对称形貌和注入氟惰性气体的表面的配合下，所制备的非对称光滑表面适用于水环境中的定向和连续气泡输送。更重要的是，由于氟惰性气体的硬压缩特性，即使在加压环境（0.65 MPa）下，也有助于非对称光滑表面具有出色的气泡输送能力，显示了其在实际工业生产中的可行性。此外，还成功地制备了具有雪花状结构和星形结构的非对称光滑表面用于实际应用，这两种结构在CO2和H2微泡的连续产生、定向输送和有效收集方面都表现出可靠的性能。
Biosurfaces with geometry-gradient structures or special wettabilities demonstrate intriguing performance in manipulating the behaviors of versatile fluids. By mimicking natural species, that is, the cactus spine with a shape-gradient morphology and the Picher plant with a lubricated inner surface, we have successfully prepared an asymmetric slippery surface by following the processes of CO2-laser cutting, superhydrophobic modification, and the fluorinert infusion. The asymmetric morphology will cause the deformation of gas bubbles and subsequently engender an asymmetric driven force on them. Due to the infusion of fluorinert, which has a low surface energy (∼16 mN/m, 25 °C) and an easy fluidic property (∼0.75 cP, 25 °C), the slippery surface demonstrates high adhesive force (∼300 μN) but low friction force on the gas bubbles. Under the cooperation of the asymmetric morphology and fluorinert infused surface, the fabricated asymmetric slippery surface is applicable to the directional and continuous bubble delivery in an aqueous environment. More importantly, due to the hard-compressed property of fluorinert, the asymmetric slippery surface is facilitated with distinguished bubble transport capability even in a pressurized environment (∼0.65 MPa), showing its feasibility in practical industrial production. In addition, asymmetric slippery surfaces with a snowflake-like structure and a star-shaped structure were successfully fabricated for the real-world applications, both of which illustrated reliable performances in the continuous generation, directional transportation, and efficient collection of CO2 and H2 microbubbles.