Hybrid Polyester Coating Incorporating Functionalized Mesoporous Carriers for the Holistic Protection of Steel Surfaces

Hollamby, Martin J.; Fix, Dmitri; Dönch, Ingo; Borisova, Dimitriya; Möhwald, Helmuth; Shchukin, Dmitry G.

doi:10.1002/adma.201003035

Cited by 83 publications

(47 citation statements)

References 23 publications

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“…catalysis, drug delivery, chromatography, corrosion inhibition), almost all of the preparation methods suffer the requirement of templating species, hightemperature syntheses or high shear pre-emulsification. [4][5][6][7] A spontaneous emulsification-based route to form porous materials would be cheap, simple, non-hazardous and therefore warrants further consideration. One way to functionalise the resultant particles (e.g.…”

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“…Corrosion inhibitor-containing capsules dispersed throughout a passive coating matrix have been reported that provide protection to both aluminium AA2024-T3 19 and galvanized steel. 6 Inhibitor release is thought to be directed by the change in local electrochemical potential (e.g. local pH) around the corrosion site.…”

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“…local pH) around the corrosion site. 6,20 To complement CeO 2 corrosion inhibition, 8-hydroxyquinoline (8HQ) was used, which is an effective anodic inhibitor that has exhibited synergistic effects with Ce-containing compounds. 5,11 8HQ adsorption to the CeO 2 @SiO 2 particles was visualized via a colour change in the particles to red-brown ( Fig.…”

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Porous ‘Ouzo-effect’ silica–ceria composite colloids and their application to aluminium corrosion protection

et al. 2012

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By exploiting spontaneous emulsification to prepare porous SiO 2 particles, we report the formation of porous CeO 2 @SiO 2 hybrid colloids and their incorporation into a silica-zirconia coating to improve the corrosion protection of aluminium.The ''Ouzo effect'' is probably better known as a drinkers' conundrum than as a technique for the formation of colloidal particles. The careful addition of water to e.g. Pastis, Absinthe, etc. causes the spontaneous emulsification of a metastable droplet phase, driven by the aqueous insolubility of the flavour compound (trans-anethole). Several studies have sought to characterise the underlying process 1 and to use it for the production of polymer particles and capsules.2 As a synthesis method, spontaneous emulsification has the advantage of requiring neither externally applied energy, nor stabilizing or templating species. Using a simple system consisting of water, ethanol, ammonia, hydrochloric acid and silicon alkoxides, porous silica particles were formed.3 However, few other reports use this method to form hard, porous colloidal particles and there have been no reports of their application. This is remarkable given that while porous particles have been developed for many applications (e.g. catalysis, drug delivery, chromatography, corrosion inhibition), almost all of the preparation methods suffer the requirement of templating species, hightemperature syntheses or high shear pre-emulsification. [4][5][6][7] A spontaneous emulsification-based route to form porous materials would be cheap, simple, non-hazardous and therefore warrants further consideration. One way to functionalise the resultant particles (e.g. zeolite or silica) is to adsorb active nanoparticles.8 Such hybrid colloids would have the benefit of easy solution uptake and facile incorporation into e.g. coatings.Here, a spontaneous emulsification process was used to prepare porous silica particles, 3 which are capable of nanoparticle and/or small molecule uptake. Ceria was chosen as the active content, given its known use both in oxidation catalysis 4,9 and in corrosion protection. [10][11][12] Several routes exist to form ceria nanocrystals. 9,13 Here, an adapted precipitation method was employed, 14 due to its simplicity and high yield. Fig. 1a shows the characterization of the ceria particles by XRD. Peaks corresponding to the fluorite ceria structure are clearly noted and marked, with substantial broadening indicating the presence of nano-crystalline grains. The minimum grain size was calculated to be 5.5 nm by the Scherrer equation 15 using shape factor = 0.9, in line with an approximate particle size estimated by TEM (d E 5 nm, Fig. S1, ESIw). TEM images of the silica spheres formed by spontaneous emulsification are shown in Fig. 1b. The sample mainly consisted of polydisperse porous particles with d mean E 200 nm (see ESIw). The dependence on the zeta potential with pH ( Fig. 1c) for the silica and ceria particles showed typical isoelectric points (IEP) at pH 3.2 and pH 8.5, respectively. 16 The BET su...

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Porous ‘Ouzo-effect’ silica–ceria composite colloids and their application to aluminium corrosion protection

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“…131 Containers with polymeric shells of significant polarity such as PU, polyurea (PUa), and polyamides, are well-dispersible in media with high to moderate polarity because of their essential surface charge stabilizing containers from coagulation. Most frequently, substances having the surface activity are used for this purpose including ionic, nonionic and polymeric surfactants.…”

Section: Distribution Of Containers In the Matrices Of Novel Protectimentioning

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Anticorrosion Coatings with Self-Recovering Ability Based on Damage-Triggered Micro- and Nanocontainers

Grigoriev

2015

Intelligent Coatings for Corrosion Control

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“…A challenge to this approach is that, for many corrosion applications, healing must be possible in high humidity or underwater environments. Nevertheless, many chemistries have demonstrated preliminary success in healing of coatings including poly(dimethylsiloxane),2 epoxy,3 benzotriazole,4 alkoxysilanes,5 tung oil,6 linseed oil,7 and silyl ester 8. A somewhat different approach to healing coatings takes advantage of coaxial electrospinning to form self‐healing coatings 9.…”

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Diffusion and Reaction Phenomena in Solution‐Based Healing of Polymer Coatings Using the Diels–Alder Reaction

Pratama¹,

Peterson²,

Palmese³

2011

Macro Chemistry & Physics

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The healing of a furan-functional epoxy coating using bismaleimide (BMI) solutions is demo nstrated. Corrosion studies of scratched coated carbon steel show that solution healing of damaged coatings inhibits corrosion. The healing relies on (i) the diffusion of solution components into the polymer, causing the system to swell, thus bringing crack surfaces into contact, and (ii) Diels-Alder adduct formation between furan moieties of the polymer network and the maleimide, resulting in covalent bonding across the crack interface. For the system investigated, crack healing is reaction-limited for small crack widths. The results provide a guideline for the design and implementation of self-healing systems based on BMI solution encapsulation.

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Hybrid Polyester Coating Incorporating Functionalized Mesoporous Carriers for the Holistic Protection of Steel Surfaces

Cited by 83 publications

References 23 publications

Porous ‘Ouzo-effect’ silica–ceria composite colloids and their application to aluminium corrosion protection

Porous ‘Ouzo-effect’ silica–ceria composite colloids and their application to aluminium corrosion protection

Anticorrosion Coatings with Self-Recovering Ability Based on Damage-Triggered Micro- and Nanocontainers

Diffusion and Reaction Phenomena in Solution‐Based Healing of Polymer Coatings Using the Diels–Alder Reaction

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