Dhar Manideepa, Sarkar Debasmita, Das Avijit, Rahaman S K Asif, Ghosh Dibyendu, Manna Uttam
Department of Chemistry, Indian Institute of Technology-Guwahati, Guwahati, Assam, 781039, India.
Centre for Nanotechnology, Indian Institute of Technology-Guwahati, Guwahati, Assam, 781039, India.
Nat Commun. 2024 Jul 11;15(1):5838. doi: 10.1038/s41467-024-49807-8.
Bio-inspired surfaces with wettability patterns display a unique ability for liquid manipulations. Sacrificing anti-wetting property for confining liquids irrespective of their surface tension (γ), remains a widely accepted basis for developing wettability patterns. In contrast, we introduce a 'liquid-specific' wettability pattern through selectively sacrificing the slippery property against only low γ (<30 mN m) liquids. This design includes a chemically reactive crystalline network of phase-transitioning polymer, which displays an effortless sliding of both low and high γ liquids. Upon its strategic chemical modification, droplets of low γ liquids fail to slide, rather spill arbitrarily on the tilted interface. In contrast, droplets of high γ liquids continue to slide on the same modified interface. Interestingly, the phase-transition driven rearrangement of crystalline network allows to revert the slippery property against low γ liquids. Here, we report a 'rewritable' and 'liquid-specific' wettability pattern for high throughput screening, separating, and remoulding non-aqueous liquids.
具有润湿性图案的仿生表面展现出独特的液体操控能力。不顾液体表面张力（γ），通过牺牲抗润湿性来限制液体，仍然是开发润湿性图案的广泛接受的基础。相比之下，我们通过选择性地仅牺牲对低γ（<30 mN/m）液体的滑爽性，引入了一种“液体特异性”润湿性图案。这种设计包括一个相变聚合物的化学反应性结晶网络，它对低γ和高γ液体都能轻松滑动。经过其策略性化学修饰后，低γ液体的液滴无法滑动，而是在倾斜界面上任意溢出。相比之下，高γ液体的液滴在相同的修饰界面上继续滑动。有趣的是，结晶网络的相变驱动重排允许恢复对低γ液体的滑爽性。在此，我们报道了一种用于高通量筛选、分离和重塑非水液体的“可重写”且“液体特异性”的润湿性图案。
