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1.
Dr. Kun Zhou Yihao Zhou Dr. Hongchao Yang Prof. Dr. Huile Jin Prof. Dr. Yonggang Ke Prof. Dr. Qiangbin Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(41):18406-18412
We present a strategy of interfacially bridging covalent network within tobacco mosaic virus (TMV) virus-like particles (VLPs). We arranged T103C cysteine to laterally conjugate adjacent subunits. In the axis direction, we set A74C mutation and systematically investigated candidate from E50C to P54C as the other thiol function site, for forming longitudinal disulfide bond chains. Significantly, the T103C-TMV-E50C-A74C shows the highest robustness in assembly capability and structural stability with the largest length, for TMV VLP to date. The fibers with lengths from several to a dozen of micrometers even survive under pH 13. The robust nature of this TMV VLP allows for reducer-free synthesis of excellent electrocatalysts for application in harshly alkaline hydrogen evolution. 相似文献
2.
Ultrastable Imine‐Based Covalent Organic Frameworks for Sulfuric Acid Recovery: An Effect of Interlayer Hydrogen Bonding 下载免费PDF全文
Arjun Halder Suvendu Karak Dr. Matthew Addicoat Saibal Bera Dr. Amit Chakraborty Shebeeb H. Kunjattu Dr. Pradip Pachfule Prof. Dr. Thomas Heine Prof. Dr. Rahul Banerjee 《Angewandte Chemie (International ed. in English)》2018,57(20):5797-5802
A rapid and scalable synthesis of six new imine‐linked highly porous and crystalline COFs is presented that feature exceptionally high chemical stability in harsh environments including conc. H2SO4 (18 m ), conc. HCl (12 m ), and NaOH (9 m ). This is because of the presence of strong interlayer C?H???N hydrogen bonding among the individual layers, which provides significant steric hindrance and a hydrophobic environment around the imine (?C=N?) bonds, thus preventing their hydrolysis in such an abrasive environment. These COFs were further converted into porous, crystalline, self‐standing, and crack‐free COF membranes (COFMs) with extremely high chemical stability for their potential applications for sulfuric acid recovery. The as‐synthesized COFMs exhibit unprecedented permeance for acetonitrile (280 Lm?2 h?1 bar?1) and acetone (260 Lm?2 h?1 bar?1). 相似文献
3.
In situ Generation of Reticulate Micropores through Covalent Network/Polymer Nanocomposite Membranes for Reverse‐Selective Separation of Carbon Dioxide 下载免费PDF全文
Eunkyung Jeon Dr. Su‐Young Moon Jae‐Sung Bae Prof. Ji‐Woong Park 《Angewandte Chemie (International ed. in English)》2016,55(4):1318-1323
We demonstrate the synthesis of a microporous covalent‐network membrane derived from co‐continuous blends of a porogenic urea network and a polyimide (PI). We show that the urea networks in the PI matrix may be thermally rearranged while selectively expelling small molecular fragments, thereby forming a new network bearing reticular microporous molecular pathways. The porous structures enable reverse‐selective gas separation, efficiently blocking carbon dioxide to which most polymeric membranes exhibit selective permeability. The proposed method for fabricating microporous organic membranes with highly tunable porosities using a variety of chemical structures and processing parameters is facile and shows promise for the creation of new membrane‐based molecular‐separation techniques. 相似文献
4.
Vitor M. Correlo Ana R. Costa‐Pinto Paula Sol José A. Covas Mrinal Bhattacharya Nuno M. Neves Rui L. Reis 《Macromolecular bioscience》2010,10(12):1495-1504
We report the production of chitosan‐based fibers and chitosan fiber‐mesh structures by melt processing (solvent‐free) to be used as tissue‐engineering scaffolds. The melt‐based approach used to produce the scaffolds does not change their main characteristics, including the surface roughness and microporosity. The porosity, pore size, interconnectivity and mechanical performance of the scaffolds are all within the range required for various tissue‐engineering applications. Biological assessments are performed in direct‐contact assays. Cells are able to colonize the scaffold, including the inner porous structure. The cells show high indices of viability in all of the scaffold types.