Ultrathin and high-performance covalent organic frameworks composite membranes generated by oligomer triggered interfacial polymerization

Green and Fast Strategies for Energy‐Efficient Preparation of the Covalent Organic Framework TpPa‐1

“…During this step, a change in the color of the solution can be seen with the naked eye, indicating that a quick reaction is taking place at room temperature. A rapid formation of stable oligomers within the first seconds of the mixture between Pa‐1 and Tp has been detected in the literature, promoting the formation of a more densely packed and crystalline material [51] . Furthermore, under room temperature conditions, π‐π stacking interactions between monomers and oligomers seem to be a key driving force in achieving high crystalline COFs [46] .…”

“…A rapid formation of stable oligomers within the first seconds of the mixture between Pa-1 and Tp has been detected in the literature, promoting the formation of a more densely packed and crystalline material. [51] Furthermore, under room temperature conditions, π-π stacking interactions between monomers and oligomers seem to be a key driving force in achieving high crystalline COFs. [46] Similarly, in the case of TpPa-MC synthesis, the 10-minute grinding step that ensures an intimate mixture of monomers and catalyst was confirmed as an essential step of COF molecular self-organization before the heating process, giving rise to high crystallinity and SSA.…”

Ionic-Liquid-Based Aqueous Two-Phase Interfacial Polymerization of Covalent Organic Framework Membranes for Molecular Separation

“…To highlight the performance of the as-synthesized TFB-BD and Tp-BD COF membranes, water permeability and dye rejection performance for AB were compared with those of other membranes with similar interfacial synthesis in the previous works (Figure c and Table S5). It can be seen that most of the separation membranes failed to combine high permeability and excellent dye rejection simultaneously. − For the selected TFB-BD-Fum­(I), Tp-BD-DMBS­(I), and Tp-BD-Ma­(I), the water permeance can be achieved at approximately 500 L·m –2 ·h –1 ·bar –1 with a comparable dye rejection. Such superior separation performance together with high permeability of our membranes generated from the unique well-ordered pore structure, strongly confirming that amide-linked COF membranes hold significant promise for high-performance membrane applications.…”

Porous crystalline materials for memories and neuromorphic computing systems

“…252–254,259–264 Compared to the first mode, the second mode exhibits the features of homogeneous reaction system, and spatial segregation of catalyst and monomers, facilitating the site-selective pre-polymerization, the generation of oligomers, and the formation of ultrathin and regular films. 265,266 However, compared to their thicker counterparts, the thin films obtained through the L–L interface method exhibit relatively lower crystallinity, 265,266 which may be attributed to the mismatch between polymerization and crystallization. In 2021, Zhan et al .…”

“…[252][253][254][259][260][261][262][263][264] Compared to the first mode, the second mode exhibits the features of homogeneous reaction system, and spatial segregation of catalyst and monomers, facilitating the site-selective pre-polymerization, the generation of oligomers, and the formation of ultrathin and regular films. 265,266 However, compared to their thicker counterparts, the thin films obtained through the L-L interface method exhibit relatively lower crystallinity, 265,266 which may be attributed to the mismatch between polymerization and crystallization. In 2021, Zhan et al introduced the solvent extraction and osmotic pressure to control the polymerization and crystallization process on the basis of homogeneous synthesis to improve the film crystallinity, named ''homogeneous-floating-concentrating'' strategy.…”