Influence of Functionalization of Nanocontainers on Self-Healing Anticorrosive Coatings



Zheng, Zhaoliang ORCID: 0000-0001-6741-6148, Schenderlein, Matthias, Huang, Xing, Brownbill, Nick, Blanc, Frederic ORCID: 0000-0001-9171-1454 and Shchukin, Dmitry ORCID: 0000-0002-2936-804X
(2015) Influence of Functionalization of Nanocontainers on Self-Healing Anticorrosive Coatings. ACS Applied Materials & Interfaces, 7 (41). 22756 - 22766.

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Abstract

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 nanoparticles 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 13C nuclear magnetic resonance, scanning and transmission electron microscopy, N2 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). en-(COO-)3- type functionalization with content of only 0.23 mmol/g was found to perform the best as a candidate for establishing pH-induced release system. It is because the resulting capped and loaded (C-L) functionalized silica nanocontainers (FSNs) exhibit a high loading (26 wt%) and release capacity (80%) for inhibitor, prevention of premature leakage (less than 2%), good dispersibility in coating matrix and cost effectiveness.

Item Type: Article
Uncontrolled Keywords: functionalization, coating materials, self healing materials, electrochemistry inhibitors
Subjects: Q Science > QD Chemistry
Depositing User: Symplectic Admin
Date Deposited: 06 Oct 2015 14:23
Last Modified: 27 May 2020 10:14
DOI: 10.1021/acsami.5b08028
Related URLs:
URI: http://livrepository.liverpool.ac.uk/id/eprint/2029721