2-Chloromethylbenzimidazole loaded and polyethyleneimine/poly(sodium-p-styrenesulfonate) decorated fumed silica as filler to prepare pH stimuli-responsive and self-healing epoxy composite coating

Zhou, Liben; Wang, Xiaodong; Zhao, Xuan-Xuan; Dai, Jian S.; Wang, Yue; Guo, Wenlong; Li, Zhaolei; Li, Weili

doi:10.1016/j.porgcoat.2022.107307

Cited by 3 publications

(1 citation statement)

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“…To overcome some shortcomings of silica particles such as insensitivity to pH, hydrophilicity, and high porosity causing the accumulation of electrolytes, researchers have examined the modification of silica particles with other nanostructures like PANI 14 and MoS 2 nanosheets 15 in the field of protective epoxy coatings. In more recent research, Zhou et al 16 introduced a self-healing and pH-sensitive (in neutral and acid media) epoxy composite coating for mild steel substrate by incorporating fumed silica (FS) particles loaded with inhibitor and decorated with polyethylenimine/poly(sodium-pstyrenesulfonate). In another recent work presented by Zhang et al, 17 it was shown that a complex nanostructure containing modified mesoporous silica nanoparticles (loaded with inhibitor and decorated with chitosan) and a two-dimensional covalent organic framework (COF) significantly improves the barrier protection of neat epoxy coating on a Q235 steel substrate and confers self-healing ability to the epoxy coating.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Fumed Nanosilica@Nanodiamond Hybrid Nanoparticles with Dual Sustainable Self-Healing and Barrier Anticorrosive Performances in Epoxy Coating

Dabaleh,

Mohammadi,

Shojaei

et al. 2024

ACS Appl. Mater. Interfaces

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Fumed nanosilica@nanodiamond attached by APTES [(3-aminopropyl) triethoxysilane], named FSiO 2 @sND, was examined as an efficient anticorrosive nanohybrid for epoxy coating. Compared with fumed nanosilica (FSiO 2 ), nanodiamond (ND) moderated the hydrophilic nature of FSiO 2 @sND and offered additional functional groups to the nanohybrid, i.e., carboxylic groups of ND and functional groups of APTES, while retaining the ecofriendly nature of FSiO 2 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 FSiO 2 @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/FSiO 2 @ 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/FSiO 2 coating. Epoxy/FSiO 2 @sND intact coating showed much higher low-frequency impedance, i.e., 7.23 Ω•cm 2 , compared with epoxy/FSiO2 coating, i.e., 5.44 Ω•cm 2 , and neat epoxy coating, i.e., 5.71 Ω•cm 2 , after 22 weeks of immersion in salty solution. This result along with a detailed analysis of EIS data for intact coatings suggested that FSiO 2 @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.

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