Journal ArticleDOI
Mixed Matrix Membranes (MMMs) Comprising Exfoliated 2D Covalent Organic Frameworks (COFs) for Efficient CO2 Separation
Zixi Kang,Yongwu Peng,Yuhong Qian,Daqiang Yuan,Matthew Addicoat,Thomas Heine,Zhigang Hu,Lincoln Tee,Zhengang Guo,Dan Zhao +9 more
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TLDR
In this article, two water-stable covalent organic frameworks (COFs) were exfoliated into nanosheets and even monolayers with high aspect ratio and blended with commercial polymers poly(ether imide) (Ultem) or polybenzimidazole (PBI) into mixed matrix membranes (MMMs) exhibiting highly homogeneous textures due to the excellent compatibility between COF fillers and polymer matrixes.Abstract:
Two water-stable covalent organic frameworks (COFs) named NUS-2 and NUS-3 having two-dimensional (2D) layered structures with different pore sizes were synthesized. These COFs were exfoliated into nanosheets and even monolayers with high aspect ratio. They were subsequently blended with commercial polymers poly(ether imide) (Ultem) or polybenzimidazole (PBI) into mixed matrix membranes (MMMs) exhibiting highly homogeneous textures due to the excellent compatibility between COF fillers and polymer matrixes. Thanks to the selective gas sorption properties of the porous COF fillers, the prepared MMMs exhibited increased gas permeabilities with NUS-2@PBI demonstrating an excellent H2/CO2 permselectivity that exceeded the 2008 Robeson upper bound. Our approach of using exfoliated 2D COFs as porous fillers in MMMs paves a novel way toward the tailored synthesis of advanced composite membrane materials for clean energy and environmental sustainability.read more
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Journal ArticleDOI
Covalent Organic Frameworks: Design, Synthesis, and Functions.
Keyu Geng,Ting He,Ruoyang Liu,Sasanka Dalapati,Ke Tian Tan,Zhongping Li,Shanshan Tao,Yifan Gong,Qiuhong Jiang,Donglin Jiang +9 more
TL;DR: A comprehensive review of the COF field is targeted, providing a historic overview of the chemistry, the advances in the topology design and synthetic reactions, illustrate the structural features and diversities, and scrutinize the development and potential of various functions through elucidating structure-function correlations.
Journal ArticleDOI
Covalent organic frameworks: a materials platform for structural and functional designs
TL;DR: Covalent organic frameworks (COFs) are a class of crystalline porous polymer that allows the atomically precise integration of organic units into extended structures with periodic skeletons and ordered nanopores as mentioned in this paper.
Journal ArticleDOI
Covalent Organic Frameworks: Structures, Synthesis, and Applications
Maria S. Lohse,Thomas Bein +1 more
TL;DR: Covalent organic frameworks (COFs) as mentioned in this paper are crystalline porous polymers formed by a bottom-up approach from molecular building units having a predesigned geometry that are connected through covalent bonds.
Journal ArticleDOI
Covalent Organic Frameworks: Chemistry beyond the Structure.
TL;DR: A closer look is taken at the growth of COFs from mere supramolecular structures to potential industrializable materials.
Journal ArticleDOI
Covalent organic frameworks for separation applications.
TL;DR: This review attempts to highlight the key advancements made in the synthesis of COFs for diverse separation applications such as water treatment or the separation of gas mixtures and organic molecules, including chiral and isomeric compounds.
References
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Journal ArticleDOI
Carbon Dioxide Capture in Metal–Organic Frameworks
Kenji Sumida,David L. Rogow,Jarad A. Mason,Thomas M. McDonald,Eric D. Bloch,Zoey R. Herm,Tae-Hyun Bae,Jeffrey R. Long +7 more
TL;DR: Kenji Sumida, David L. Rogow, Jarad A. Mason, Thomas M. McDonald, Eric D. Bloch, Zoey R. Herm, Tae-Hyun Bae, Jeffrey R. Long
Journal ArticleDOI
Porous, Crystalline, Covalent Organic Frameworks
Adrien P. Côté,Annabelle I. Benin,Nathan W. Ockwig,Michael O'Keeffe,Adam J. Matzger,Omar M. Yaghi +5 more
TL;DR: Covalent organic frameworks (COFs) have been designed and successfully synthesized by condensation reactions of phenyl diboronic acid and hexahydroxytriphenylene to form rigid porous architectures with pore sizes ranging from 7 to 27 angstroms.
Journal ArticleDOI
The upper bound revisited
TL;DR: The empirical upper bound relationship for membrane separation of gases initially published in 1991 has been reviewed with the myriad of data now presently available as mentioned in this paper, which indicates a different solubility selectivity relationship for perfluorinated polymers compared to hydrocarbon/aromatic polymers.
Journal ArticleDOI
Self-consistent-charge density-functional tight-binding method for simulations of complex materials properties
Marcus Elstner,Marcus Elstner,D. Porezag,G. Jungnickel,J. Elsner,M. Haugk,Th. Frauenheim,Sándor Suhai,Gotthard Seifert +8 more
TL;DR: In this paper, an extension of the tight-binding (TB) approach to improve total energies, forces, and transferability is presented. The method is based on a second-order expansion of the Kohn-Sham total energy in density-functional theory (DFT) with respect to charge density fluctuations.
Journal ArticleDOI
Liquid Exfoliation of Layered Materials
Valeria Nicolosi,Manish Chhowalla,Mercouri G. Kanatzidis,Michael S. Strano,Jonathan N. Coleman +4 more
TL;DR: A number of methods have been developed to exfoliate layered materials in order to produce monolayer nanosheets, which are ideal for applications that require surface activity.