Ultrasonication‐Assisted Waterborne Synthesis of Self‐Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection,Advanced Materials Interfaces

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Ultrasonication‐Assisted Waterborne Synthesis of Self‐Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-12-03 , DOI: 10.1002/admi.202001886
Songyu Liu ₁ , Yunshan Gao ₁ , Yanling Ma ₁ , Tingting Meng ₁ , Changfeng Yi ₂ , Zushun Xu ₂ , Bo Peng ₃ , Ziwei Deng _{1,

2}

Affiliation

Self‐restorable superhydrophobic surfaces have attracted increasing attention due to their important applications. However, great challenges in an easy and rapid way to accomplish superhydrophobic surfaces with tunable self‐restorability are retained. Here, a facile yet fast strategy is presented to endow commercial substrates with self‐restorable superhydrophobic surfaces irrespective of their surface chemistry and geometry. By ultrasonicating an aqueous solution comprising poly(dimethylsiloxane), bis(3‐aminopropyl)‐terminated (H₂N‐PDMS‐NH₂) and dopamine hydrochloride (DA) with substrates for 30 min, superhydrophobic surfaces are yielded. Under ultrasonication, H₂N‐PDMS‐NH₂ is dispersed as the microdroplets and produces a weakly alkaline environment to enhance self‐polymerization of DA to polydopamine (PDA). In turn, PDA reacts with microdroplets and simultaneously anchors them to substrates, creating hierarchical morphology. The diffusion of hydrophobic H₂N‐PDMS‐NH₂ from the interior to the surface of the coating leads to superhydrophobic surface. This superhydrophobicity is self‐restorable after it is destroyed by air‐plasma or amphiphilic molecules, presumably because the H₂N‐PDMS‐NH₂ diffusion from the interior to the particles’ surface minimizes the overall interfacial‐energy. The self‐restoration is significantly accelerated by heating or rubbing the substrates. This self‐restoration offers superhydrophobic materials with a considerably prolonged life‐span, promising a wide range of applications, e.g., sustainable oil/water separation.

中文翻译：

超声波辅助水性合成油藏中可延长寿命的自修复超疏水表面

自恢复的超疏水表面由于其重要的应用而引起了越来越多的关注。但是，仍然存在以简单快速的方式完成具有可调自恢复性的超疏水表面的巨大挑战。在此，提出了一种简便而快速的策略，使商用基材具有可自修复的超疏水表面，而无论其表面化学性质和几何形状如何。通过用底物超声处理包含聚二甲基硅氧烷，双（3-氨基丙基）端基（H ₂ N-PDMS-NH ₂）和多巴胺盐酸盐（DA）的水溶液30分钟，可产生超疏水表面。在超声作用下，H ₂ N‐PDMS‐NH ₂分散成微滴并产生弱碱性环境，以增强DA向聚多巴胺（PDA）的自聚合。依次，PDA与微滴反应并将其同时锚定在基质上，从而形成分层形态。疏水性H ₂ N-PDMS-NH ₂从内部扩散到涂层表面会形成超疏水性表面。这种超疏水性在被空气等离子或两亲分子破坏后可以自我修复，大概是因为H ₂ N‐PDMS‐NH ₂从内部到颗粒表面的扩散使整体界面能最小化。通过加热或摩擦基材，可以大大加快自我恢复。这种自我修复为超疏水材料提供了相当长的使用寿命，有望实现广泛的应用，例如可持续的油/水分离。

更新日期：2021-01-12

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