Ultrasonication-Assisted Waterborne Synthesis of Self-Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection

Songyu Liu, Yunshan Gao, Yanlin Ma, Tingting Meng, Changfeng Yi, Zushun Xu, Bo Peng, Ziwei Deng*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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.
Original languageEnglish
Article number2001886
Number of pages11
JournalAdvanced Materials Interfaces
Early online date2020
DOIs
Publication statusPublished - 3 Dec 2020
MoE publication typeA1 Journal article-refereed

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