Reactive silica nanoparticles turn epoxy coating from hydrophilic to super-robust superhydrophobic

Zhi, Danfeng; Wang, Huanhuan; Jiang, Dong; Parkin, Ivan P.; Zhang, Xia

doi:10.1039/c8ra10046b

Cited by 37 publications

(22 citation statements)

References 38 publications

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“…According to previous studies, the inclusion of fillers such as graphene nanosheets and silica nanoparticles into composite matrices increased the surface roughness [31,32]. In the present study, when the modified graphene nanosheets (GN-chem) were embedded into GT and GTS sols, the presence of oxide functionalities and fewer number of stacked layers, resulted from chemical modification/exfoliation and confirmed by FTIR and Raman analyses, increased the surface area and the surface roughness of the corresponding coatings.…”

Section: Characterization Of the Coatingssupporting

confidence: 75%

Hybrid Sol–Gel Silica Coatings Containing Graphene Nanosheets for Improving the Corrosion Protection of AA2024-T3

et al. 2020

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In the present work, nanostructured graphene nanosheets were added to hybrid silica sols and deposited on aluminium alloy A2024-T3 to study the effect on the corrosion behaviour. Sols were prepared using tetraethyl-orthosilicate (TEOS), 3-glycidoxypropyl-trimethoxysilane (GPTMS) and a colloidal silica suspension (LUDOX) as silica precursors with adding chemically modified graphene nanosheets (GN-chem). The graphene nanosheets were modified through a straightforward and simple hydrothermal approach and then, dispersed into a silica sol (SiO2/GN-chem). ATR-FTIR was used to optimize the silica sol–gel synthesis and to confirm the cross-linking of the silica network. The corrosion behaviour of the SiO2/GN-chem coatings was also analysed by electrochemical measurement (potentiodynamic polarization) in 0.05 M NaCl solution. The results showed that the incorporation of modified graphene nanosheets into hybrid silica sol–gel coatings affected the corrosion properties of the substrates. An improvement in the corrosion resistance was observed likely due to the enhanced barrier property and hydrophobic behaviour obtained by incorporation of GN-chem and colloidal silica nanoparticles.

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Section: Characterization Of the Coatingssupporting

confidence: 75%

Hybrid Sol–Gel Silica Coatings Containing Graphene Nanosheets for Improving the Corrosion Protection of AA2024-T3

et al. 2020

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“…[25][26][27][28] These studies demonstrated that the presented laboratory scale coatings had enhanced abrasion resistance in comparison to these commercial coatings. 29,30 The commercial coating technologies available are often limited by the strength of the bonding between the substrate and the coating. 30 A further objective of this study is to investigate the use of atmospheric pressure plasma treatments as a mechanism of enhancing coating adhesion.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the protective performance of hydrophobic coatings applied on carbon-fibre epoxy composites

O'Connor

Dowling

2019

Journal of Composite Materials

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Carbon–fibre epoxy composites are widely used for high-performance structural applications, where they are often exposed to harsh environments. The result of moisture ingress has been extensively studied, causing significant deterioration in the mechanical properties of these composites. This study evaluates the performance of five commercial hydrophobic coatings as protective layers, to inhibit moisture ingress into the composite. The coatings evaluated were NeverWet, HydroBead, SHC, Aculon and LiquidGlass. These coatings were characterised and compared in terms of hydrophobicity, surface energy, roughness and chemical composition. This study also evaluated two atmospheric plasma pre-treatments as a means of enhancing the adhesion performance of these coatings. The pre-treatments involved the use of an air plasma for the activation of the epoxy, as well as the plasma deposition of a nanometre thick SiOx interlayer coating. The durability and protective performance of the coatings, with and without the pre-treatments were then compared using an abrasion test as well as a water immersion study. The use of both plasma pre-treatments was found to enhance the adhesion and the abrasion performance of four out of the five coatings. Of the coatings and pre-treatments investigated, the LiquidGlass in conjunction with a SiOx-coating interlayer was found to exhibit the highest abrasion resistance. This was followed by the composite, which was plasma activated prior to the application of the Aculon coating. Only minor differences were observed when comparing the total moisture ingress (M%) of the epoxy, coated with the different hydrophobic layers. The composite coated with the Aculon and SiOx interlayer exhibited the least amount of moisture ingress, at 0.90%, compared to 1.08% of the uncoated specimen. The shear strength of epoxy composite, coated with the LiquidGlass, NeverWet and the activated Aculon combination, were within the range of the uncoated specimens, therefore the moisture ingress was reversible upon heating and no permanent damage to the epoxy–fibre interface was observed. It is concluded that, of the five coatings investigated, both the Aculon coating and LiquidGlass in combination with a SiOx interlayer coating, exhibit the greatest potential as protective layers for carbon fibre epoxy composites.

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“…For example, 3-aminopropyl triethoxysilane (APTES) is widely used to bind to epoxy resins [ 74 , 75 , 76 ] and polyurethane [ 77 ], increasing their performance, or even as grafting sites for RAFT agents [ 78 ] and ATRP initiators [ 79 ]. On the other hand, functionalizing SNPs with γ-(2,3-epoxypropoxy)propyl-trimethoxysilane (GPTMS) can increase the compatibility of the inorganic component within epoxy resins [ 80 , 81 , 82 , 83 , 84 ]. GPTMS can be further modified into carbonate functionalized silanes (4-((3-(trimethoxysilyl)propoxy)methyl)-1,3-dioxolan-2-one, CPS) increasing polyurethane-based coatings performance [ 85 ].…”

Section: Preparation and Functionalization Of Silica Nanostructurementioning

confidence: 99%

“…The effect of the coupling agent on the surface of SNPs is critical for specific properties of the polymer-silica nanostructure, such as its hydrophilicity, hydrophobicity, or chemical binding ability [ 5 , 73 ]. Zhi et al [ 84 ] have functionalized the surface of the SNPs with GPTMS for better compatibility with epoxy resin. They were able to achieve strong bonds between the silica and polymer matrix, obtaining a nanometer-scale surface roughness that resulted in a superhydrophobic material.…”

Section: Preparation and Functionalization Of Silica Nanostructurementioning

confidence: 99%

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

2021

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Combining organic and inorganic components at a nanoscale is an effective way to obtain high performance coating materials with excellent chemical and physical properties. This review focuses on recent approaches to prepare hybrid nanostructured waterborne coating materials combining the mechanical properties and versatility of silica as the inorganic filler, with the flexural properties and ease of processing of the polymer matrix. We cover silica-polymer coupling agents used to link the organic and inorganic components, the formation of hybrid films from these silica-polymer nanostructures, and their different applications. These hybrid nanostructures can be used to prepare high performance functional coatings with different properties from optical transparency, to resistance to temperature, hydrophobicity, anti-corrosion, resistance to scratch, and antimicrobial activity.

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Reactive silica nanoparticles turn epoxy coating from hydrophilic to super-robust superhydrophobic

Abstract: Superhydrophobic organic–inorganic hybrid nanocomposite coatings have received much attention because they possess the advantages of both inorganic and organic materials.

Cited by 37 publications

References 38 publications

Hybrid Sol–Gel Silica Coatings Containing Graphene Nanosheets for Improving the Corrosion Protection of AA2024-T3

Hybrid Sol–Gel Silica Coatings Containing Graphene Nanosheets for Improving the Corrosion Protection of AA2024-T3

Evaluation of the protective performance of hydrophobic coatings applied on carbon-fibre epoxy composites

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

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