Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 41, Pages 22756-22766Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b08028
Keywords
self-healing anticorrosion; H+/OH- dual responsive; feedback coating nanocontainer; organosilyl-functionalization
Funding
- ERG ENERCAPSULE grant
- Brian Mercer Feasibility Award of Royal Society of Chemistry
- University of Liverpool [EP/M00869X/1]
- EPSRC
- Engineering and Physical Sciences Research Council [EP/M00869X/1, EP/K039687/1, 1510930] Funding Source: researchfish
- EPSRC [EP/M00869X/1, EP/K039687/1] Funding Source: UKRI
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Feedback coating based on pH-induced release of inhibitor from organosilyl-functionalized containers is considered as a compelling candidate to achieve smart self-healing corrosion protection. Four key factors that determine the overall coating performance include (1) the uptake and release capacity of containers, (2) prevention of the premature leakage, (3) compatibility of containers in coating matrix, and (4) cost and procedure simplicity consideration. The critical influence introduced by organosilyl-functionalization of containers is systematically demonstrated by investigating MCM-41 silica nanopartides modified with ethylenediamine (en), en-4-oxobutanoic acid salt (en-COO-), and en-triacetate (en-(COO-)(3)) with higher and lower organic contents. The properties of the modified silica nanoparticles as containers were mainly characterized by solid-state C-13 nuclear magnetic resonance, scanning and transmission electron microscopy, N-2 sorption, thermogravimetric analysis, small-angle X-ray scattering, dynamic light scattering, and UV-vis spectroscopy. Finally, the self-healing ability and anticorrosive performances of hybrid coatings were examined through scanning vibrating electrode technique (SVET) and electrochemical impedance spectroscopy (EIS). We found that en-(COO-)(3) type functionalization with content of only 0.23 mmol/g performed the best as a candidate for establishing pHinduced release system because the resulting capped and loaded (C-L) functionalized silica nanocontainers (FSNs) exhibit high loading (26 wt %) and release (80%) capacities for inhibitor, prevention of premature leakage (less than 2%), good dispersibility in coating matrix, and cost effectiveness.
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