ORCID Profile
0000-0001-5908-266X
Current Organisation
Jilin University
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Publisher: Springer Science and Business Media LLC
Date: 19-11-2022
DOI: 10.1038/S41467-022-34849-7
Abstract: Covalent organic frameworks (COF), with rigid, highly ordered and tunable structures, can actively manipulate the synergy of entropic selectivity and enthalpic selectivity, holding great potential as next-generation membrane materials for ion separations. Here, we demonstrated the efficient separation of monovalent cations by COF membrane. The channels of COF membrane are decorated with three different kinds of acid groups. A concept of confined cascade separation was proposed to elucidate the separation process. The channels of COF membrane comprised two kinds of domains, acid-domains and acid-free-domains. The acid-domains serve as confined stages, rendering high selectivity, while the acid-free-domains preserve the pristine channel size, rendering high permeation flux. A set of descriptors of stage properties were designed to elucidate their effect on selective ion transport behavior. The resulting COF membrane acquired high ion separation performances, with an actual selectivity of 4.2–4.7 for K + /Li + binary mixtures and an ideal selectivity of ~13.7 for K + /Li + .
Publisher: American Chemical Society (ACS)
Date: 10-12-2013
DOI: 10.1021/JA407431W
Abstract: The spectral properties of emissive photoproducts, formed upon 633 nm irradiation of a terrylene diimide dye, were investigated. Ensemble and single-molecule level experiments were conducted by immobilizing the TDI dye molecules in a polystyrene film. In the bulk experiments, green emission could be observed from the photobleached areas (photobleached with 633 nm light) when excited with 480 or 514 nm light. Similar phenomena were also observed at the single-molecule level. On the basis of the single-molecule experiments, a conversion efficiency of about 5% was estimated for the formation of emissive spectrally blue-shifted photoproducts. These green emissive photoproducts have spectral properties that resemble those of lower rylene homologues, e.g. perylene diimide or perylene monoimide. Our results indicate that the formation of blue-shifted emissive photoproducts can have implications for analyzing single-molecule FRET experiments or multiple color-labeled fluorescent systems.
Publisher: Wiley
Date: 29-11-2019
Abstract: 2D conductive metal–organic frameworks (2D c ‐MOFs) feature promising applications as chemiresistive sensors, electrode materials, electrocatalysts, and electronic devices. However, exploration of the spin‐polarized transport in this emerging materials and development of the relevant spintronics have not yet been implemented. In this work, layer‐by‐layer assembly was applied to fabricate highly crystalline and oriented thin films of a 2D c ‐MOF, Cu 3 (HHTP) 2 , (HHTP: 2,3,6,7,10,11‐hexahydroxytriphenylene), with tunable thicknesses on the La 0.67 Sr 0.33 MnO 3 (LSMO) ferromagnetic electrode. The magnetoresistance (MR) of the LSMO/Cu 3 (HHTP) 2 /Co organic spin valves (OSVs) reaches up to 25 % at 10 K. The MR can be retained with good film thickness adaptability varied from 30 to 100 nm and also at high temperatures (up to 200 K). This work demonstrates the first potential applications of 2D c ‐MOFs in spintronics.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA06927B
Abstract: This work highlights the importance of both the surface chemistry and the persistence length of crystalline pores in COFs. Protons are found to transfer predominantly through grain boundary regions instead of the crystalline pores.
No related grants have been discovered for Long Chen.