Researchers found that a self-healing protective coating with dual reversible bonds can be triggered by photothermal responsive Co9S8@Bi2S3 nanofillers.
Source: DK_2020 – adobe.stock.com
Herein, researchers developed a novel composite coating with excellent self-healing and anticorrosion properties activated by photothermal responsive hollow core-shell nanofillers. A photothermal heterojunction Co9S8@Bi2S3 was prepared and integrated into polyurethane containing disulfide bonds. It is found that the heterojunction has enhanced the light absorption capacity and has increased the number and lifetime of photogenerated electron-hole pairs, making more photogenerated charges pass through the heterojunction interface by reducing interface transfer resistance and releasing heat as well. Under 808 nm near-infrared light irradiation, the photothermal effect of Co9S8@Bi2S3 can trigger the reconstruction of dynamic disulfide bonds and reversible hydrogen bonds simultaneously to heal coating scratches.
Event Tip: Fundamentals of Functional Coatings
Dive into the world of functional coatings designed to offer specialised properties such as anti-fouling, anti-ice, easy-to-clean, and drag reduction. This tutorial will cover fundamental principles, materials selection, surface modification techniques, and case studies across different applications. Join us online on 03 Oct 2024 for the EC Short Course “Fundamentals of Functional Coatings” and explore how these coatings are transforming industries worldwide.
The surface characterisation and electrochemical test results manifest that the coating containing 2 wt% 10 %-Co9S8@Bi2S3 nanofillers displayed excellent self-healing and anti-corrosive capabilities. The self-healing efficiency of nearly 90 % was achieved after five-time cutting-healing cycles on the coating. The protection performance of the initial immersion stage could be restored by nearly 100 % after five-time self-healing, and the low-frequency impedance modulus was above 108 Ω cm2 even after 60 days of immersion. This work would provide a new tactic for developing multi-cycle self-healing coatings triggered by photothermal effects.
Source: Progress in Organic Coatings, Volume 185, December 2023, 107891
Hersteller zu diesem Thema