Chen Xiaofeng, Yang Guiyan, Cao Xinhe, Zhu Xinyue, Wang Xinyu, Chen Si, Cui Yushuang, Ge Haixiong, Li Yang
Department of Materials Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, P. R. China.
National Laboratory of Solid State Microstructures, Nanjing 210093, P. R. China.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54807-54817. doi: 10.1021/acsami.4c10416. Epub 2024 Aug 21.
Developing surfaces that effectively repel low-surface-tension liquids with tunable adhesive properties remains a pivotal challenge. Micronano hierarchical re-entrant structures emerge as a promising solution, offering a robust structural defense against liquid penetration, minimizing area fraction, and creating narrow gaps that generate substantial upward Laplace pressure. However, the absence of an efficient, scalable, and tunable construction method has impeded their widespread applications. Here, drawing inspiration from springtail epidermal structures, octopus suckers, and rose petals, we present a scalable manufacturing strategy for artificial micronano hierarchical T-shaped structures. This strategy employs double-transfer UV-curing nanoimprint lithography to form nanostructures on microstructured surfaces, offering high structural tunability. This approach enables precise control over topography, feature size, and arrangement of nano- and microscale sections, resulting in superamphiphobic surfaces that exhibit high contact angles (>150°) and tunable adhesive forces for low-surface-energy liquids. These surfaces can be applied to droplet-based microreactors, programmable droplet-transfer systems, and self-cleaning surfaces suitable for various liquids, particularly those with low surface tension. Remarkably, we have also succeeded in fabricating the hierarchical structures on flexible and transparent substrates. We demonstrate the advantages of this strategy in the fabrication of hierarchical micronanostructures, opening up a wide range of potential applications.
开发能够有效排斥低表面张力液体并具有可调粘附特性的表面仍然是一个关键挑战。微米纳米级分层凹腔结构作为一种有前景的解决方案出现，它提供了强大的结构防御以防止液体渗透，将面积分数最小化，并创造出能产生大量向上拉普拉斯压力的狭窄间隙。然而，缺乏一种高效、可扩展且可调的构建方法阻碍了它们的广泛应用。在此，我们从弹尾虫表皮结构、章鱼吸盘和玫瑰花瓣中汲取灵感，提出了一种用于人工微米纳米级分层T形结构的可扩展制造策略。该策略采用双转移紫外光固化纳米压印光刻技术在微结构化表面上形成纳米结构，具有高度的结构可调性。这种方法能够精确控制纳米和微米级部分的形貌、特征尺寸和排列，从而得到具有高接触角（>150°）且对低表面能液体具有可调粘附力的超疏水表面。这些表面可应用于基于液滴的微反应器、可编程液滴转移系统以及适用于各种液体（特别是那些具有低表面张力的液体）的自清洁表面。值得注意的是，我们还成功地在柔性和透明基板上制造了分层结构。我们展示了这种策略在制造分层微米纳米结构方面的优势，开辟了广泛的潜在应用。
