High resistance to impalement of highly hydrophobic polycarbonate surfaces with nanosilica-coated rectangular pyramid arrays
High resistance to impalement of highly hydrophobic polycarbonate surfaces with nanosilica-coated rectangular pyramid arrays
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DOI：
10.1007/s10853-021-06843-9
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发表时间：
2022-01
影响因子：
4.5
通讯作者：
Guofeng Qin;Anfu Chen;Dejie Huang;Jindi Lai;Chuangkai Fang;Zhengrong Zhang;Jingjing Zhang;C. L
中科院分区：
文献类型：
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作者：
Guofeng Qin;Anfu Chen;Dejie Huang;Jindi Lai;Chuangkai Fang;Zhengrong Zhang;Jingjing Zhang;C. L
自自然界生物表面结构被发现以来，具有极高或极低水滴粘附性的动植物细胞表面由于其在基础研究中的重要意义而引起了人们的极大关注。目前的工作提出了灵活的模板复制方法的生物启发的聚碳酸酯（PC）表面具有高度结构化的方形微柱和矩形金字塔阵列。此外，二氧化硅纳米粒子（SNP）或1H，1H，2 H，2 H-全氟癸基三氯硅烷（FDTS）涂覆在模板上转移到PC熔体在热压缩成型的过程中，并牢固地粘附到PC复制品的皮肤，形成分层的微观结构。低表面能物质SNPs或FDTS可以增加开口模板中的微结构高度，并使锥形模板中的微结构尺寸变小。结果表明，SNPs可以增强PC复型表面的物理拓扑结构，FDTS可以使PC复型表面的化学成分多样化。随之而来的表面框架包含气穴，其容纳由SNP积累形成的高度防水和机械刚性的亚微米结构。显然，由于能够在高达1100 Pa的水压下工作，微结构化PC表面通过液滴弹跳和滚动行为的组合表现出高效的自清洁性能，弹跳液滴的最大高度高达3.98 mm（即，1.6乘以液滴直径）。图形摘要
Since the surface structure of natural biology was discovered, highly hydrophobic surfaces, deriving from cuticles of animals and plants with extremely high or low water droplet adhesion, have attracted a great attention due to their significance in basic research. The present work proposes flexible template replication methods for bio-inspired polycarbonate (PC) surfaces with highly structured square micropillars and rectangular pyramids arrays. Further, silica nanoparticles (SNPs) or the 1H,1H,2H,2H-perfluorodecyltrichlorosilane (FDTS) coated on templates were transferred to the PC melt during the process of hot compression molding and firmly adhered to the skin of the PC replicas, forming hierarchical microstructure. The low-surface-energy matter SNPs or FDTS can increase the heights of microstructure in the open-ended templates and miniaturize the dimensions of microstructure in the conically ended templates. The results indicate that the SNPs can enhance the physical topology of PC replica surfaces, and the FDTS can diversify the chemical ingredients of PC replica surfaces. The consequent surface frame containing air-pockets that house highly water-resistant and mechanically rigid submicron structure formed by accumulation of SNPs. Apparently, with the ability to work under a water pressure of up to 1100 Pa, the microstructured PC surface exhibits a high-efficiency self-cleaning performance by a combination of droplet bouncing and rolling behaviors with a maximum height of bounced droplets up to ∼3.98 mm (i.e., 1.6 times the diameter of the droplet) after impacting.Graphical abstract