Tannic complexes coated nanocontainers for controlled release of corrosion inhibitors in self-healing coatings
| Autor: | Bei Qian, Theo Hobson, Matthew Bilton, Marios Michailidis, Dmitry G. Shchukin, Zhaoliang Zheng |
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| Rok vydání: | 2019 |
| Předmět: |
Benzotriazole
General Chemical Engineering Alkyd 02 engineering and technology engineering.material Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Controlled release 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound Corrosion inhibitor chemistry Coating Chemical engineering visual_art Tannic acid Electrochemistry visual_art.visual_art_medium engineering 0210 nano-technology |
| Zdroj: | ELECTROCHIMICA ACTA |
| ISSN: | 0013-4686 |
| Popis: | Nanocontainers with controlled release properties have been used in self-healing coatings for many years. However, the spontaneous leakage of the small molecular weight inhibitors from the nanocontainers promoted the development of nanovalves or gatekeepers to control inhibitor release. Herein, we demonstrate a facile method to encapsulate corrosion inhibitor in mesoporous silica nanoparticles (MSNs) with the help of tannic acid complexes, which endow the inhibitor loaded MSNs with pH-controlled release function. Commercial water-borne alkyd coating impregnated with 2 wt% of benzotriazole-loaded nanocontainers presented significant self-healing effect after 20 days of immersion in 0.1 M NaCl solution from both released benzotriazole and tannic acid as confirmed by electrochemical impedance spectroscopy and microscopy. The impedance modulus of coating with nanocontainers increased from 4.7 × 104 Ω cm2 to 1.8 × 105 Ω cm2 after 15 days of immersion. |
| Databáze: | OpenAIRE |
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