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- W2138467652 abstract "Advanced materials with surfaces that have controllable oil wettability when submerged in aqueous media have great potential for various underwater applications. Here we have developed smart surfaces on commonly used materials, including non-woven textiles and polyurethane sponges, which are able to switch between superoleophilicity and superoleophobicity in aqueous media. The smart surfaces are obtained by grafting a block copolymer, comprising blocks of pH-responsive poly(2-vinylpyridine) and oleophilic/hydrophobic polydimethylsiloxane (i.e., P2VP-b-PDMS) on these materials. The P2VP block can alter its wettability and its conformation via protonation and deprotonation in response to the pH of the aqueous media, which provides controllable and switchable access of oil by the PDMS block, resulting in the switchable surface oil wettability in the aqueous media. On the other hand, the high flexibility of the PDMS block facilitates the reversible switching of the surface oil wettability. As a proof of concept, we also demonstrate that materials functionalized with our smart surfaces can be used for highly controllable oil/water separation processes. Peng Wang and co-workers have devised smart surfaces that have switchable wettability – affinity to oil and water phases. Such materials are useful for applications that require oil/water separation, and might help clean up oil spills in future. The researchers have endowed materials with smart surfaces by decorating them with a polymer made of two flexible blocks with different properties. One block exhibits a high affinity to oil phases and low affinity to aqueous ones, while the other changes its wettability but also its shape through protonation, depending on the acidity of the aqueous phase. At different pHs, therefore, either one block or the other is predominantly exposed to the solution, endowing the surface with different wettability characteristics. These smart surfaces can be coated on commonly used materials such as textiles and sponges, and showed good properties for oil capture and release applications. Schematics showing the switchable oil wettability of the P2VP-b-PDMS-grafted surface in aqueous media with different pH." @default.
- W2138467652 created "2016-06-24" @default.
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- W2138467652 date "2012-02-01" @default.
- W2138467652 modified "2023-10-10" @default.
- W2138467652 title "Smart surfaces with switchable superoleophilicity and superoleophobicity in aqueous media: toward controllable oil/water separation" @default.
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- W2138467652 doi "https://doi.org/10.1038/am.2012.14" @default.
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