NDLI: Redox-triggered controlled release systems-based bi-layered nanocomposite coating with synergistic self-healing property

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Ting Tan, LingHua Wang, MingDong Fu, JiaJun Ding, ChenDi Xu, JianHua
Copyright Year	2017
Abstract	Redox-triggered smart nanocontainers, RTSNs 1, assembled by installing supramolecular switches onto the exterior surface of mesoporous silica nanoparticles, were successfully synthesized. The reversible transition upon redox stimuli from self-complexation to self-dissociation of supramolecular switches, which are in the form of β-cyclodextrin monofunctionalized with a ferrocene moiety, realizes switch behavior and regulates the release of p-coumaric acid (CA) encapsulated in mesoporous silica nanoparticles. Based on these facts, a bi-layered nanocomposite coating was designed and coated on the surface of AA2024 by successive deposition of a Ce(IV)-doped ZrO2–SiO2 sol–gel coating and an RTSNs 1 incorporated ZrO2–SiO2 coating. The bi-layered nanocomposite coating shows high barrier performance, effectively delaying the corrosion process occurring on the metallic surface in 0.5 M NaCl solution for 20 days. Once the bi-layered nanocomposite coating suffers local damage, Ce(IV) salt meets with RTSNs 1 in the scratched area and thus open the supramolecular switches, resulting in the release of the organic corrosion inhibitors, CA molecules. In the meantime, Ce(IV) salt is reduced to the inorganic corrosion inhibitor, Ce(III) salt. The combination of CA and Ce(III) produces a synergistic inhibition effect, which rapidly repairs the damaged surface and provides durable self-healing functionality.
Starting Page	1756
Ending Page	1768
Page Count	13
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	4
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta08547d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Mesoporous silica Redox Ferrocene Acid Nanocomposite Zirconium dioxide Corrosion Corrosion inhibitor
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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