Wang Yang, Wang Qifei, Wang Baixian, Tian Ye, Di Jiancheng, Wang Zuankai, Jiang Lei, Yu Jihong
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University Changchun 130012 P. R. China
Department of Mechanical Engineering, City University of Hong Kong Hong Kong 999077 P. R. China.
Chem Sci. 2021 Mar 17;12(17):6136-6142. doi: 10.1039/d1sc00808k.
There has been great interest in the fabrication of solid surfaces with desirable under-liquid wettability, and especially under-liquid dual-lyophobicity, because of their potential for widespread use. However, there remains the lack of a general principle to modulate the under-liquid wettability in terms of surface energy (SE). Herein, we found that the relative proportion between the polar and dispersive components in SE that reflects the competition between hydrophilicity and lipophilicity governs the under-liquid wettability of the solid surface. For the first time, we introduced hydrophilic-lipophilic balance (HLB) calculated solely based on the amount and type of hydrophilic and lipophilic fragments in surface molecules to rapidly predict the under-liquid wettability of a solid surface, thereby guiding the fabrication of solid surfaces with desirable under-liquid wettability. Accordingly, the under-liquid dual superlyophobic surfaces in a nonpolar oil-water-solid system were fabricated by grafting molecules with appropriate HLB values (, 6.341-7.673 in a cyclohexane-water-solid system) onto porous nanofibrous membranes, which were able to achieve continuous separation of oil-water mixtures. This work provides reasonable guidance for the fabrication of solid surfaces with targeted under-liquid wettability, which may lead to advanced applications in oil-water-solid systems.
由于具有广泛应用的潜力，人们对制备具有理想的液下润湿性，尤其是液下双疏性的固体表面产生了浓厚兴趣。然而，在基于表面能（SE）调节液下润湿性方面，仍然缺乏一个通用原则。在此，我们发现，表面能中反映亲水性与亲脂性之间竞争的极性和分散性成分的相对比例，决定了固体表面的液下润湿性。我们首次引入了仅基于表面分子中亲水性和亲脂性片段的数量和类型计算得出的亲水亲油平衡（HLB），以快速预测固体表面的液下润湿性，从而指导制备具有理想液下润湿性的固体表面。相应地，通过将具有适当HLB值（在环己烷 - 水 - 固体系统中为6.341 - 7.673）的分子接枝到多孔纳米纤维膜上，制备了非极性油 - 水 - 固体系统中的液下双超疏表面，该表面能够实现油水混合物的连续分离。这项工作为制备具有目标液下润湿性的固体表面提供了合理指导，这可能会在油 - 水 - 固体系统中带来先进应用。
