非常希望在液体系统下开发超疏液表面，该表面可以用作分离油/水和油/油混合物以及从水中去除染料的多功能平台，但仍然难以实现。在此，通过锚定在GO片材表面的多巴胺的自聚合制备了在液体体系下具有超疏液性的氧化石墨烯/聚多巴胺（GO/PDA）涂层。所得GO/PDA涂层同时具有水下超疏油性和油下超疏水性。利用其在油/水系统下的双重超疏液性，GO/PDA涂层织物应用于按需油/水分离。令人惊讶的是，GO/PDA 涂层织物在油/油不混溶体系下表现出双重超疏油性，使其能够有效分离油/油混合物。由于亲水性，GO/PDA 涂层的分层纹理和吸收效果，GO/PDA 涂层织物可以作为过滤模块，有效去除水中的染料。此外，GO/PDA 涂层还可以作为保护金属免受腐蚀的屏障。

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It is highly desirable to develop superlyophobic surfaces under liquid system that can act as a versatile platform for separation of both oil/water and oil/oil mixtures and removing dye from water, but it is still hard to achieve. Herein, a graphene oxide/polydopamine (GO/PDA) coating with superlyophobicity under liquid system was fabricated through the self-polymerization of dopamine anchored on the GO sheet surface. The obtained GO/PDA coating possessed both under-water superoleophobicity and under-oil superhydrophobicity. Utilizing its dual superlyophobicity under an oil/water system, the GO/PDA coated fabric was applied to on-demand oil/water separation. Amazingly, the GO/PDA coated fabric exhibited dual superoleophobicity under an immiscible oil/oil system, which allowed it to separate oil/oil mixtures effectively. Due to the water affinity, layered texture, and absorption effect of the GO/PDA coating, the GO/PDA coated fabric can be served as a filtration module for removing dye from water efficiently. Moreover, the GO/PDA coating could also serve as a barrier to protect metal against corrosion.