Metal-Organic Frameworks (Mofs) Decorated Mw-Cnt; An Advanced Nanocarrier For Smart Delivery of Moo4-2 in Hybrid Silane Coating

The high surface area with exceptional characteristics i.e. electrical and thermal/mechanical as well as barrier properties have made multi-walled carbon nanotube (mw-cnt) as an advanced nanomaterial for new applications i.e., the development of high-performance anti-corrosion coatings. however, due to the lake of inhibitive properties, mw-cnt has limited applications in the development of smart anti-corrosion systems. for the first time, the mw-cnt surface was functionalized by advance nano-porous carriers based on metal-organic frameworks (mofs) for achieving a high capacity of inhibitor loading and ph-sensitive release properties. owing to the high surface area, moderate stability in saline solution (near-neutral ph), and partial decomposition characteristics in low and high phs, the zeolitic imidazolate framework-67 (zif-67) was selected for this purpose. through mw-cnt oxidation at high temperature in the acidic condition, it was converted to an oxidized-mw-cnt with many surface hydroxyl/carboxylic functional groups. through adsorption of cobalt ions on the o-mw-cnt surface through electrostatic interaction and then addition of 2-methylimidazole as organic linker the zif-67 particles were grown over the cnt surface. after characterization of o-mw-cnt@zif-67 structure via ft-ir, raman, and xrd methods and studying the particles morphology by microscopy analyses, i.e., tem and fe-sem, the successful synthesis of the mentioned nano-material was proved. in the next step, molybdate ions (moo4-2) were loaded into the o-mw-cnt@zif-67 nano-carrier and the release properties and anti-corrosion effects were studied in the solution phase via icp, and polarization/eis techniques, respectively. finally, the developed nanocarrier loaded with moo4-2 ions was loaded into a hybrid silane coating, applied on the steel surface, and characterized via salt-spray and eis tests. results proved the effective self-healing corrosion protection ability of the resultant coating with nanocarrier with enhanced barrier properties.

Metal-organic frameworks (MOFs) decorated MW-CNT; an advanced nanocarrier for smart delivery of MoO4-2 in hybrid silane coating

The high surface area with exceptional characteristics i.e. electrical and thermal/mechanical as well as barrier properties have made multi-walled carbon nanotube (MW-CNT) as an advanced nanomaterial for new applications i.e., the development of high-performance anti-corrosion coatings. However, due to the lake of inhibitive properties, MW-CNT has limited applications in the development of smart anti-corrosion systems. For the first time, the MW-CNT surface was functionalized by advance nano-porous carriers based on metal-organic frameworks (MOFs) for achieving a high capacity of inhibitor loading and pH-sensitive release properties. Owing to the high surface area, moderate stability in saline solution (near-neutral pH), and partial decomposition characteristics in low and high pHs, the zeolitic imidazolate framework-67 (ZIF-67) was selected for this purpose. Through MW-CNT oxidation at high temperature in the acidic condition, it was converted to an oxidized-MW-CNT with many surface hydroxyl/carboxylic functional groups. Through adsorption of cobalt ions on the O-MW-CNT surface through electrostatic interaction and then addition of 2-methylimidazole as organic linker the ZIF-67 particles were grown over the CNT surface. After characterization of O-MW-CNT@ZIF-67 structure via FT-IR, Raman, and XRD methods and studying the particles morphology by microscopy analyses, i.e., TEM and FE-SEM, the successful synthesis of the mentioned nano-material was proved. In the next step, molybdate ions (MoO4-2) were loaded into the O-MW-CNT@ZIF-67 nano-carrier and the release properties and anti-corrosion effects were studied in the solution phase via ICP, and polarization/EIS techniques, respectively. Finally, the developed nanocarrier loaded with MoO4-2 ions was loaded into a hybrid silane coating, applied on the steel surface, and characterized via salt-spray and EIS tests. Results proved the effective self-healing corrosion protection ability of the resultant coating with nanocarrier with enhanced barrier properties.