development of covalent organic framework (cof) assembled carbon nanotube for anti-corrosion applications

Covalent organic frameworks (cofs) are a new type of porous materials with a unique combination of chemical modularity and structural diversity, crystallinity, high surface area, tunable pore size, thermal stability, and low density. the strength of covalent bonds in cofs contribute to the significantly improved stability, the general irreversibility of kinetically controlled reactions which prevent the molecular rearrangement and form a crystalline structure. in this study, for the first time, we synthesized, characterized, and evaluated the cof-based materials for anti-corrosion applications. herein, the cof structure was obtained by reaction of melamine and terephthaldehyde at 180 ºc via a solvothermal method. afterward, it was successfully grafted on the multi-walled carbon nanotube (cnt) through an in situ strategy followed by loading with zinc cations as corrosion inhibitors. the characterization was carried out using ft-ir and fe-sem and eis studies were performed to investigate the anti-corrosion properties. ft-ir results illustrated the reactions of organic ligands and formation triazine rings. moreover, the similarity of peaks appeared in cnt-cof-zn approved the grafting of cof on carbon nanotubes and loading of zinc cations. fe-sem images revealed a spherical structure for the cof which was covered the surface of cnt completely. finally, the eis studies showed a significant rise in total resistance of steel substrate reaching to 4000 ohm.cm2 in 3.5 wt. % nacl solution.

Development of Covalent Organic Framework (COF) assembled carbon nanotube for anti-corrosion applications

Covalent Organic Frameworks (COFs) are a new type of porous materials with a unique combination of chemical modularity and structural diversity, crystallinity, high surface area, tunable pore size, thermal stability, and low density. The strength of covalent bonds in COFs contribute to the significantly improved stability, the general irreversibility of kinetically controlled reactions which prevent the molecular rearrangement and form a crystalline structure. In this study, for the first time, we synthesized, characterized, and evaluated the COF-based materials for anti-corrosion applications. Herein, the COF structure was obtained by reaction of Melamine and Terephthaldehyde at 180 ºC via a solvothermal method. Afterward, it was successfully grafted on the Multi-walled carbon nanotube (CNT) through an in situ strategy followed by loading with zinc cations as corrosion inhibitors. The characterization was carried out using FT-IR and FE-SEM and EIS studies were performed to investigate the anti-corrosion properties. FT-IR results illustrated the reactions of organic ligands and formation triazine rings. Moreover, the similarity of peaks appeared in CNT-COF-Zn approved the grafting of COF on carbon nanotubes and loading of zinc cations. FE-SEM images revealed a spherical structure for the COF which was covered the surface of CNT completely. Finally, the EIS studies showed a significant rise in total resistance of steel substrate reaching to 4000 ohm.cm2 in 3.5 wt. % NaCl solution.