title: An intelligent anticorrosion coating based on pH-responsive supramolecular nanocontainers.
abstract: The hollow mesoporous silica nanoparticles (HMSNs), which have been used as the nanocontainers for the corrosion inhibitor, benzotriazole, were fabricated using the hard-template method. Alkaline-responsive HMSNs based on cucurbit[6]uril (CB[6])/bisammonium supramolecular complex and acid-responsive HMSNs based on α-cyclodextrin (α-CD)/aniline supramolecular complex, which operate in water, have been achieved and characterized by solid-state NMR, thermogravimetry analysis, scanning electron microscopy, transmission electron microscopy and N(2) adsorption-desorption analysis. The two elaborately designed nanocontainers show the pH-controlled encapsulation/release behaviors for benzotriazole molecules. Equal amounts of the alkaline- and acid-responsive nanocontainers were uniformly distributed in the hybrid zirconia-silica sol-gel coating and thus formed the intelligent anticorrosion coating. The self-healing property of AA2024 alloy coated with the intelligent anticorrosion coating is evaluated by electrochemical impedance spectroscopy (EIS). The sol-gel coating doped with the pH-responsive nanocontainers clearly demonstrates long-term corrosion protection performances when compared to the undoped sol-gel coating, which is attributed to the release of corrosion inhibitor from the nanocontainers after feeling the changes of environmental pH values near the corroded areas.
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, JiangSu, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: JiaJun
authors.initials: J
authors.lastname: Fu
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D040761:Biomimetic Materials / Q000737:chemistry; D001952:Bridged-Ring Compounds / Q000737:chemistry; D003343:Corrosion; D003692:Delayed-Action Preparations / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D043862:Rotaxanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014230:Triazoles / Q000008:administration & dosage*; D047391:alpha-Cyclodextrins / Q000737:chemistry; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils
chemical_list: D000814:Aniline Compounds; D001952:Bridged-Ring Compounds; D003692:Delayed-Action Preparations; D007093:Imidazoles; D000644:Quaternary Ammonium Compounds; D043862:Rotaxanes; D012822:Silicon Dioxide; D014230:Triazoles; D047391:alpha-Cyclodextrins; C454805:cucurbit(6)uril; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils; C012771:benzotriazole; C032613:alpha-cyclodextrin