Inhibitor-self-gated stimuli-responsive anticorrosion system based on π-π stacking

Published on Nov 15, 2020in Chemical Engineering Journal10.652
· DOI :10.1016/J.CEJ.2020.125917
Meng Cheng4
Estimated H-index: 4
(China University of Petroleum),
Qiang Lyu3
Estimated H-index: 3
(OSU: Ohio State University)
+ 5 AuthorsSongqing Hu15
Estimated H-index: 15
(China University of Petroleum)
Abstract Most of existing nanocontainers suffer from tedious, complicated and unsustainable assembly process which restricts their application in corrosion protection as smart inhibitor carriers. In this study, we adopted the framework-hybridization approach to prepare a smart anticorrosion system (MBT@Ph-HPMO), with MBT inhibitor as cargo and phenylene-bridged hollow periodic mesoporous organosilica (Ph-HPMO) as nanocontainer. Results reveal that the π-π stacking between MBT and framework of Ph-HPMO serves as nature valve, which is supplemented by the molecular dynamic simulation. The encapsulated inhibitor was loaded into Ph-HPMO at neutral pH, demonstrating fast release in acidic environment. On-demand release of inhibitors from MBT@Ph-HPMO contributed to achieving in situ active corrosion protection. Anticorrosion performance of MBT@Ph-HPMO for copper alloy was evaluated in 3.5 wt% NaCl solution for a period of 30 days. The alloy exhibited the slightest corrosion damage in the corrosion medium with the addition of 0.24 wt% MBT@Ph-HPMO. This facile and versatile strategy will have broad applications in new class of nanocontainers fabrication and open up a new prospect for active corrosion protection.
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