Zhecun Wang,Jianlin Yang,Xiadong Dai,Jing Guo,Shenghai Li,Tauqir A. Sherazi,Suobo Zhang
Directional liquid transport driven by the interface or surface property of Janus porous membrane owes great significance to many applications such as separation technology, fog collection, and energy devices. The Janus porous membranes have successfully demonstrated an efficient oil self-transport in water and also enable directional water transport in air or oil-water interface. However, the directional water transport in oil environment is a challenge because of the relatively low surface tension of oil. In this work, a novel integrated Janus porous membrane is developed for the first time to construct self-propelled energy free directional water transport in oil system that successfully demonstrated to be a facile “water diode” for under-oil water one-way regulation. Additionally, this Janus porous membrane exhibits an interesting tunable fluid-gating behavior for either water or oil, using optimized conditions. The current findings may promote the innovation towards directional liquid transport science and will open up new avenues for diverse on-demand liquids manipulation scenarios such as water-in-heavy oil emulsion separation.
Zehao Chen,Jihao Zuo,Ting Zhao,Qing Tan,Yunjun Nong,Shouping Xu,Jiang Cheng,Xiufang Wen,Pihui Pi
Developing separation materials with high separation efficiency and permeation flux for water-in-oil emulsions is an urgent demand and still a huge challenge. In this study, through anodization, electrostatic assembly of carbon nanotubes (CNTs), and grafting of nonafluorohexyltriethoxysilane (NFH-silane), a superhydrophobic copper foam containing re-entrant nanostructures was fabricated. The permeation channels were controllably extended by stacking multiple copper foams to form a columnar bed separator, and the residence time of emulsified water droplets was prolonged. When 30 pieces of copper foams were accumulated and the thickness of the stack was extended to 45 mm, the separation efficiency reached 99.14 %, and the permeation flux reached 31,500 Lm −2 h −1 for separating surfactant-stabilized water-in-toluene emulsion. Due to the re-entrant nanostructures, the superhydrophobicity of the fabricated copper foam could keep stable in alkali, salt, oil environments, and only slightly decreased in surfactant environment, and the separation efficiency and flux can be recovered to the original level after multiple separation by simple cleaning, showing excellent superwettability stability and separation reusability. All these fascinating performance makes the superhydrophobic copper foam a promising candidate for continuous separating water-in-oil emulsions.
危险品化学品经营许可证（带存储）