journal article·2024-03-26

Synthesis and Properties of a Zwitterionic Covalent Organic Framework (COF): The Meltability Strategy and Processability

Xiao Ling Gu, Luyang Zhao, Jie Sun, Xiang Kun Cui, Guo Qiang Li, Si Yuan Hu, Yu Heng Deng, Zhongfeng Li, Kai Li, Hai Wang, Chong-Qing Wan

Chemistry of Materials· Volume 36· Issue 6
Publisher page

Abstract

Covalent organic frameworks (COFs) are porous materials with well-defined structures and promising properties related to low-energy consumption technologies in industry. However, the lack of processability of powder COFs remains a great challenge and severely restricts their practical applications, such as thin membranes for industrial superpure species separation. The hot-melt process is widely applied in industrial manufacturing. Here, we synthesized the zwitterionic COF and demonstrated its easy melting at moderate temperatures with the assistance of buffer of Bro̷nsted acid (HA). The melting liquid COFdHA (<148 °C) enabled their process into a large-area thin film via a simple hot-casting knife method and crystalline membrane through a subsequent structure-recovery procedure. The crystalline membranes preserved the COF’s pristine structure, and exhibited the highest nanofiltration performance compared to analogous COF/MOF obtained via traditional tedious processes, while the melt-quenched products can also be used as glassy solid electrolytes with fast ionic conduction. Therefore, such a zwitterionic COF can act as a porous and dense material for specific applications, showing two sides of a coin. Structure, structure–property relationship, and the melting mechanism for the new type of zwitterionic COF are evidenced via experiment and theoretical calculation.
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Research context

OpenAlex topics: Covalent Organic Framework Applications · Metal-Organic Frameworks: Synthesis and Applications · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, Capital Normal University, Beijing 100048, China

State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, China

Department of Physics, Capital Normal University, Beijing 100048, China

Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China

Funding

Beijing Municipal Natural Science Foundation · National Natural Science Foundation of China · Key Laboratory of Life Organic Phosphorus Chemistry and Chemical Biology, Ministry of Education, Tsinghua University · State Key Laboratory of Structural Chemistry at Fujian Institute of Research on the Structure of Matter

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