00619nas a2200181   4500008004100000022001400041245009000055210006900145260000800214300000900222490000700231653000900238653001600247653001600263100001900279700002000298856011900318       2014                        eng d  a2053-273300aConstruction of highly crystalline ultraporous covalent organic frameworks in seconds0 aConstruction of highly crystalline ultraporous covalent organic   cAPR  aC4560 v7010aCOFs10aCrystalline10aUltraporous1 aKarak, Suvendu1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/construction-highly-crystalline-ultraporous-covalent-organic-frameworks-seconds02283nas a2200229   4500008004100000245009200041210006900133260000800202300001600210490000700226520149400233100002201727700002701749700001901776700002401795700002101819700002101840700002401861700002401885700002001909856012401929       2018                        eng d00aConvergent covalent organic framework thin sheets as flexible supercapacitor electrodes0 aConvergent covalent organic framework thin sheets as flexible su  cAUG  a28139-281460 v103 aFlexible supercapacitors in modern electronic equipment require light-weight electrodes, which have a high surface area, precisely integrated redox moieties, and mechanically strong flexible free-standing nature. However, the incorporation of the aforementioned properties into a single electrode remains a great task. Herein, we could overcome these challenges by a facile and scalable synthesis of the convergent covalent organic framework (COF) free-standing flexible thin sheets through solid-state molecular baking strategy. Here, redox-active anthraquinone (Dq) and pi-electron-rich anthracene (Da) are judiciously selected as two different linkers in a beta-ketoenamine-linked two-dimensional (2D) COF. As a result of precisely integrated anthraquinone moieties, COF thin sheet exhibits redox activity. Meanwhile, pi-electron-rich anthracene linker assists to improve the mechanical property of the free-standing thin sheet through the enhancement of noncovalent interaction between crystallites. This binder-free strategy offers the togetherness of crystallinity and flexibility in 2D COF thin sheets. Also, the synthesized porous crystalline convergent COF thin sheets are benefited with crack-free uniform surface and light-weight nature. Further, to demonstrate the practical utility of the material as an electrode in energy-storage systems, we fabricated a solid-state symmetrical flexible COF supercapacitor device using a GRAFOIL peeled carbon tape as the current collector.1 aKhayum, Abdul, M.1 aVijayakumar, Vidyanand1 aKarak, Suvendu1 aKandambeth, Sharath1 aBhadra, Mohitosh1 aSuresh, Karthika1 aAcharambath, Nikhil1 aKurungot, Sreekumar1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/convergent-covalent-organic-framework-thin-sheets-flexible-supercapacitor-electrodes02436nas a2200241   4500008004100000022001400041245015800055210006900213260000900282300001400291490000800305520154300313100002801856700002301884700002701907700001901934700001801953700002201971700002201993700003202015700002002047856012702067       2020                        eng d  a0002-786300aConnecting microscopic structures, mesoscale assemblies, and macroscopic architectures in 3D-printed hierarchical porous covalent organic framework foams0 aConnecting microscopic structures mesoscale assemblies and macro  cMAY   a8252-82610 v1423 a<p>The induction of macro and mesopores into two-dimensional porous covalent organic frameworks (COFs) could enhance the exposure of the intrinsic micropores toward the pollutant environment, thereby, improving the performance. However, the challenge is to build a continuous hierarchically porous macro-architecture of crystalline organic materials in the bulk scale. In this regard, we have strategized a novel synthetic method to create hierarchically porous COF foams consisting of ordered micropores (2-2.2 nm) and disordered meso and macropores (50 nm to 200 mu m) as well as ordered macropores (1.5 mm to 2 cm). Herein, graphene oxide was used for creating disordered macro and mesopores in COF-GO foams. Considering the rheological features of the precursor hydrogel, we could integrate crystalline and porous COF-GO foams into self-supported three-dimensional (3D)-printed objects with the desired shapes and sizes. Therefore, we have engineered the 3D macro-architecture of COF-GO foams into complex geometries keeping their structural order and continuous porosity intact over a range of more than a million (10(-9) m to 10(-3) m). The interconnected 3D openings in these COF-GO foams further enhance the rapid and efficient uptake of organic and inorganic pollutants from water (&gt;95% removal within 30 s). The abundant distribution of interconnected macroporous volume (55%) throughout the COF-GO foam matrix enhances the flow of water (1.13 x 10(-3) m.s(-1)) which results in efficient mass transport and adsorption.</p>
1 aMohammed, Abdul, Khayum1 aUsgaonkar, Saurabh1 aKanheerampockil, Fayis1 aKarak, Suvendu1 aHalder, Arjun1 aTharkar, Minakshi1 aAddicoat, Matthew1 aAjithkumar, Thalasseril, G.1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/connecting-microscopic-structures-mesoscale-assemblies-and-macroscopic-architectures-3d