State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, People's Republic of China.
Nano Lett. 2021 Apr 14;21(7):3302-3309. doi: 10.1021/acs.nanolett.1c00826. Epub 2021 Apr 1.
Nanomeshes having ultrathin thicknesses and penetrating nanopores promise fast diffusion and precise selectivity and are highly desired in diffusion-involved processes such as separation. Herein, we report a liquid-phase two-dimensional (2D) assembly strategy to synthesize phenolic and carbonaceous nanomeshes with sub-10 nm pores and thicknesses. The synthesis is enabled simply by introducing glycerol in the thermopolymerization of resol/polyether micelles dispersed in ethanol. Experimental and simulation results reveal that glycerol's strong ability to form hydrogen bonds constrain the motion of the micelles, directing them to pack and merge exclusively in the lateral direction. Upon removal of polyether, we obtain phenolic nanomeshes with lateral sizes up to hundreds of micrometers, which can be further converted to carbonaceous nanomeshes. As a proof of concept, we use stacked phenolic and carbonaceous nanomeshes as separation membranes. They show superior permselectivity to nanosized solutes with permeance ∼2-110 times higher than that of other membranes.
具有超薄厚度和贯穿纳米孔的纳米网 promises 快速扩散和精确选择性，在涉及扩散的过程中如分离 highly 受到青睐。在此，我们报道了一种液相二维（2D）组装策略来合成具有 sub-10nm 孔径和厚度的酚醛和碳质纳米网。这种合成方法很简单，只需在 resol/polyether 胶束分散在乙醇中的热聚合过程中引入甘油。实验和模拟结果表明，甘油形成氢键的强能力限制了胶束的运动，使它们只能沿侧向进行 pack 和 merge。除去 polyether 后，我们得到了 lateral 尺寸可达数百微米的酚醛纳米网，它可以进一步转化为碳质纳米网。作为概念验证，我们使用堆叠的酚醛和碳质纳米网作为分离膜。它们对纳米级溶质表现出优异的选择性，渗透性约为其他膜的 2-110 倍。
