High-speed electrical reconfigurability of liquid-crystal semiconductor metasurfaces at visible wavelengths
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Risley, Mason James↗
Engineering topics
Huber, Dale Lehman
Publications and source records attributed to Huber, Dale Lehman.
Compositional Analysis of Pt1-XCox Thin Film with Single Deposition, Combinatorial Co-Sputter Technique
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Martinez, William Michael↗
Linkage Transformations in a Three-Dimensional Covalent Organic Framework for High-Capacity Adsorption of Perfluoroalkyl Substances
Despite their many advantages, covalent organic frameworks (COFs) built from three-dimensional monomers are synthetically difficult to functionalize. Herein, we provide a new synthetic approach to the functionalization of a three-dimensional covalent organic framework (COF-300) by using a series of solid-state linkage transformations. By reducing the imine linkages of the framework to amine linkages, we produced a more hydrolytically stable material and liberated a nucleophilic amino group, poised for further functionalization. We then treated the amine-linked COF with diverse electrophiles to generate a library of functionalized materials, which we tested for their ability to adsorb perfluoroalkyl substances (PFAS) from water. The framework functionalized with dimethylammonium groups, COF-300-dimethyl, adsorbed more than 250 mg of perfluorooctanoic acid (PFOA) per 1 g of COF, which represents an approximately 14,500-fold improvement over that of COF-300 and underscores the importance of electrostatic interactions to PFAS adsorption performance. In conclusion, this work provides a conceptually new approach to the design and synthesis of functional three-dimensional COFs.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗