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Eco-Friendly fumed nanosilica@nanodiamond hybrid nanoparticles with dual sustainable self-healing and barrier anticorrosive Performances in epoxy coating

Dabaleh, A ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1021/acsami.3c15220
  3. Publisher: ACS , 2024
  4. Abstract:
  5. Fumed nanosilica@nanodiamond attached by APTES [(3-aminopropyl) triethoxysilane], named FSiO2@sND, was examined as an efficient anticorrosive nanohybrid for epoxy coating. Compared with fumed nanosilica (FSiO2), nanodiamond (ND) moderated the hydrophilic nature of FSiO2@sND and offered additional functional groups to the nanohybrid, i.e., carboxylic groups of ND and functional groups of APTES, while retaining the eco-friendly nature of FSiO2 in the hybrid nanoparticle. The hybrid nanoparticle showed pH-sensitive release behavior in which APTES is released considerably in an alkaline medium, acting as an efficient corrosion inhibitor. A thorough electrochemical impedance spectroscopy (EIS) study of scratched coatings in a 3.5% NaCl solution disclosed that FSiO2@sND nanoparticles (at 0.33 wt % loading) conferred significant active/self-healing anticorrosion properties for the epoxy coatings, thanks to the release of APTES and the presence of carboxylic groups of ND taking part in forming a stable protective film on the substrate. Accordingly, epoxy/FSiO2@sND coatings showed a corrosion improvement efficiency of 138% at an optimum immersion time of 5 h, which was higher than the 96% improvement for epoxy/FSiO2 coating. Epoxy/FSiO2@sND intact coating showed much higher low-frequency impedance, i.e., 7.23 Ω·cm2, compared with epoxy/FSiO2 coating, i.e., 5.44 Ω·cm2, and neat epoxy coating, i.e., 5.71 Ω·cm2, after 22 weeks of immersion in salty solution. This result along with a detailed analysis of EIS data for intact coatings suggested that FSiO2@sND brought about strong barrier anticorrosive performance for epoxy coating. Such behavior was attributed to improved dispersion of nanohybrid in the epoxy matrix, enhanced cross-link density of the epoxy matrix, and improved coating/substrate adhesion caused by APTES and the carboxylic groups of ND. © 2024 American Chemical Society
  6. Keywords:
  7. Fumed nanosilica ; Nanodiamond ; PH-sensitive nanohybrids ; Smart epoxy coatings ; Alkalinity ; Corrosion inhibitors ; Corrosion resistant coatings ; Nanoparticle ; Silica nanoparticle ; 3-(aminopropyl)triethoxysilane ; Eco-friendly ; Eco-friendly corrosion inhibitor ; Epoxy coatings ; Fumed nanosilicum ; Nano Silica ; Nanohybrids ; PH sensitive ; PH-sensitive nanohybrid ; Smart epoxy coating
  8. Source: ACS Applied Materials and Interfaces ; Volume 16, Issue 4 , 2024 , Pages 5075-5092 ; 19448244 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acsami.3c15220