scholarly journals Self-standing and flexible covalent organic framework (COF) membranes for molecular separation

2020 ◽  
Vol 6 (41) ◽  
pp. eabb1110
Author(s):  
Jiangtao Liu ◽  
Gang Han ◽  
Dieling Zhao ◽  
Kangjia Lu ◽  
Jie Gao ◽  
...  
Keyword(s):  
Building Blocks ◽  
Shape Selectivity ◽  
Honeycomb Lattice ◽  
Free Standing ◽  
Covalent Bonds ◽  
Separation Science ◽  
Covalent Organic Framework ◽  
Molecular Building Blocks ◽  
Almost All ◽  
Organic Framework

Almost all covalent organic framework (COF) materials conventionally fabricated by solvothermal method at high temperatures and pressures are insoluble and unprocessable powders, which severely hinder their widespread applications. This work develops an effective and facile strategy to construct flexible and free-standing pure COF membranes via the liquid-liquid interface-confined reaction at room temperature and atmospheric pressure. The aperture size and channel chemistry of COF membranes can be rationally designed by bridging various molecular building blocks via strong covalent bonds. Benefiting from the highly-ordered honeycomb lattice, high solvent permeances are successfully obtained and follow the trend of acetonitrile > acetone > methanol > ethanol > isopropanol. Interestingly, the imine-linked COF membrane shows higher nonpolar solvent permeances than b-ketoenamine-linked COF due to their difference in pore polarity. Both kinds of COF membranes exhibit high solvent permeances, precise molecular sieving, excellent shape selectivity, and sufficient flexibility for membrane-based separation science and technology.

Recent aspects of self-oscillating polymeric materials: designing self-oscillating polymers coupled with supramolecular chemistry and ionic liquid science

2014 ◽  
Vol 16 (22) ◽  
pp. 10388-10397 ◽  
Author(s):  
Takeshi Ueki ◽  
Ryo Yoshida
Keyword(s):  
Ionic Liquid ◽  
Supramolecular Chemistry ◽  
Polymeric Materials ◽  
Building Blocks ◽  
Covalent Bonds ◽  
Spatiotemporal Structure ◽  
Molecular Building Blocks ◽  
Recent Developments

Herein, we summarise the recent developments in self-oscillating polymeric materials based on the concepts of supramolecular chemistry, where aggregates of molecular building blocks with non-covalent bonds evolve the temporal or spatiotemporal structure.

A bracket approach to improve the stability and gas sorption performance of a metal–organic framework via in situ incorporating the size-matching molecular building blocks

2016 ◽  
Vol 52 (54) ◽  
pp. 8413-8416 ◽  
Author(s):  
Di-Ming Chen ◽  
Jia-Yue Tian ◽  
Chun-Sen Liu ◽  
Miao Du
Keyword(s):  
Metal Organic Framework ◽  
Building Blocks ◽  
Gas Sorption ◽  
Molecular Building Blocks ◽  
Metal Organic ◽  
Coordination Framework ◽  
The Stability ◽  
Organic Framework

The robustness and gas sorption performance of a coordination framework can be greatly improved by incorporating size-matching molecular building blocks.

Fabrication of bilayer tetrathiafulvalene integrated surface covalent organic frameworks

2016 ◽  
Vol 18 (26) ◽  
pp. 17356-17359 ◽  
Author(s):  
Wei-Long Dong ◽  
Shu-Ying Li ◽  
Jie-Yu Yue ◽  
Cheng Wang ◽  
Dong Wang ◽  
...  
Keyword(s):  
Building Blocks ◽  
Covalent Organic Frameworks ◽  
Covalent Organic Framework ◽  
Organic Framework

A bilayer covalent organic framework (COF) of TTF-based building blocks was obtained by imine reaction between tetrathiafulvalene tetraaldehyde (4ATTF) andp-phenylenediamine (PPDA).

Modifiable diyne-based covalent organic framework: a versatile platform for in situ multipurpose functionalization

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39150-39158 ◽  
Author(s):  
Chiyao Bai ◽  
Meicheng Zhang ◽  
Bo Li ◽  
Xiaosheng Zhao ◽  
Shuang Zhang ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Active Sites ◽  
Functional Materials ◽  
Building Blocks ◽  
Covalent Organic Framework ◽  
Organic Framework

A COF material (TCD) containing diynes as both building blocks and active sites was prepared by microwave irradiation and employed as a versatile platform for the preparation of diverse functional materials.

3D covalent organic framework membrane for efficient proton conduction

2021 ◽  
Author(s):  
Chunyang Fan ◽  
Haobo Geng ◽  
Hong Wu ◽  
Quan Peng ◽  
Xiaoyao Wang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Proton Conduction ◽  
Free Standing ◽  
Covalent Organic Framework ◽  
Organic Framework

Fabricating three-dimensional (3D) covalent organic framework (COF) membranes is in infancy stage. Here, we report the fabrication of free-standing uniform 3D COF membrane, COF-300 membrane, with interconnected nanochannels using interfacial...

A Crystalline Three-Dimensional Covalent Organic Framework with Flexible Building Blocks

2021 ◽  
Vol 143 (4) ◽  
pp. 2123-2129
Author(s):  
Xiaoling Liu ◽  
Jian Li ◽  
Bo Gui ◽  
Guiqing Lin ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Building Blocks ◽  
Covalent Organic Framework ◽  
Organic Framework
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