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Understanding the separations of oil/water mixtures from immiscible to emulsions on super-wettable surfaces

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Abstract

As the frequent oil spill accidents happens and large quantities of oily wastewater from all kinds of industries are being discharged, the environment has been seriously polluted and our living areas have been horribly threatened. To deal with these issues, attentions have been aroused on the treatments of the oily wastewater. Recently, numerous superwettable materials have been fabricated. In this review, we summarize the new development of the materials for the separation of oil/water mixtures, mainly including the immiscible and emulsified mixtures. For the separation of immiscible ones, special materials with fixed wettability are firstly detailed, where three types of materials can be classified based on their wettability, i.e. superhydrophobic and superoleophilic materials, superhydrophilic and underwater superoleophobic materials, and superhydrophilic and su-peroleophobic materials. Then, the smart materials with switchable wettabilities responsive to external stimulus, for instance, light, solvent, pH, temperature, and electrical potential, are presented. Meanwhile, the single, dual, and multiple stimulus-responsive materials are also described. As for the separation of emulsified oil/water mixtures, the materials for the separation of water-in-oil (W/O), oil-in-water (O/W), and both water-in-oil (W/O) and oil-in-water (O/W) emulsions are sequentially introduced. Finally, some challenges are discussed and the outlook in this filed is proposed.

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  1. Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, 430062, China

    Hai Zhu & Zhiguang Guo

  2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Hai Zhu & Zhiguang Guo

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Zhu, H., Guo, Z. Understanding the separations of oil/water mixtures from immiscible to emulsions on super-wettable surfaces. J Bionic Eng 13, 1–29 (2016). https://doi.org/10.1016/S1672-6529(14)60156-6

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