结晶度
离子键合
离子液体
化学工程
水溶液
单体
阳离子聚合
相(物质)
材料科学
纳米技术
双水相体系
化学
共价键
有机化学
高分子化学
聚合物
离子
催化作用
工程类
作者
Zheyuan Guo,Haifei Jiang,Hong Wu,Leilang Zhang,Shuqing Song,Yu Chen,Chenyang Zheng,Yanxiong Ren,Rui Zhao,Yonghong Li,Yan Yin,Michael D. Guiver,Zhongyi Jiang
标识
DOI:10.1002/anie.202112271
摘要
Ionic covalent organic framework nanosheets (iCOFNs) with long-range ordered and mono-dispersed ionic groups hold great potential in many advanced applications. Considering the inherent drawbacks of oil-water biphase method, herein, we explore an oil-water-oil triphase method based on phase engineering strategy for the bottom-up synthesis of iCOFNs. The middle water phase serves as a confined reaction region, and the two oil phases are reservoirs for storing and supplying monomers to the water phase. A large aqueous space and low monomer concentration lead to the anisotropic gradual growth of iCOFNs into few-layer thickness, large lateral size, and high crystallinity. Notably, the resulting three cationic and anionic iCOFNs exhibit ultra-high aspect ratios of up to 20,000. We further demonstrate their application potential by processing into ultrathin defect-free COF membranes for efficient biogas separation. Our triphase method may offer an alternative platform technology for the synthesis and innovative applications of iCOFNs.
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