Sol–gel route for the building up of superhydrophobic nanostructured hybrid-coatings on copper surfaces

Caldarelli, Aurora; Raimondo, M.; Veronesi, Federico; Boveri, Giulio; Guarini, Guia

doi:10.1016/j.surfcoat.2015.06.037

Cited by 31 publications

(14 citation statements)

References 39 publications

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“…Moreover, in the last decade, considerable attention has been given to the development of advanced and multifunctional OIH sol-gel coating materials. Impressive advances have been reported concerning the use of carriers [49,51,149,[221][222][223][224] loaded with functional abilities (e.g., self-healing [61,73,152,213], anti-fouling [132] and hydrophobicity [30,225]).…”

Section: [138]mentioning

confidence: 99%

“…According to a review published by Montemor [231] in 2014, several reported encapsulation-based strategies seem to be promising; however, only a few studies were reported which validated the proposed strategies regarding the corrosion protection behavior [310][311][312]. However, important advances and developments on superhydrophobic surfaces have been achieved in the last five years [60,132,136,217,225,240,292,294,297,300,313].…”

Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

“…OIH sol-gel coatings with superhydrophobic properties for corrosion mitigation have been reported for different substrates, such as aluminum [295,311,[314][315][316][317][318], copper [225,319], magnesium [320], mild steel [321,322] and stainless steel [323]. Generally, OIH sol-gel coatings show improved UV and thermal stability when compared to organic coatings due to the high strength of the Si-O bond.…”

Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

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Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: [138]mentioning

confidence: 99%

Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

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Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…A clear example was presented by Yu and Xu [59] where fluorinated organic-inorganic hybrid films were prepared by sol-gel process, and the results indicated that the outermost layer of the water-repellent film was associated with the presence of perfluoroalkyl groups. Caldarelli et al [60] reported an optimized process for obtaining superhydrophobic copper surfaces by means of sol-gel technique. In this work, the resultant superhydrophobicity is associated with the combination of two factors, a peculiar alumina flower-like structure with submicrometric air pockets and the low surface energy of the fluorinated organic compound.…”

Section: Superhydrophobic Surfacesmentioning

confidence: 99%

“…Commercial polyester, wool and cotton fabrics; the presence of epoxide groups improves the washing durability [44] Fluoropolymer/silica organic/inorganic nanocomposite Flexible polyester fabrics; excellent superhydrophobicity [45] Fluoropolymer/silica nanocomposite Polyester fabrics; excellent superhydrophobicity [46] Sol-gel precursor and use of copper nanoparticles Cotton fabrics; multifunctionality (superhydrophobic and antibacterial surface) [47] Hybrid sol-gel coating Aluminum substrates; multifunctionality (superhydrophobic and high corrosion resistance) [56] Combination of micro-arc oxidation and sol-gel process Magnesium alloy; multifunctionality (superhydrophobic and enhanced corrosion resistance) [57] Combination of hydrothermal and sol-gel process Zinc substrate; multifunctionality (superhydrophobic and good corrosion resistance) [58] Flower like alumina obtained by sol-gel process and fluoroalkylsilane Copper surfaces; a high repellent behavior as a function of thermal treatment [60] layer-by-layer method by using both TiO 2 and SiO 2 nanoparticles; further modification with a fluoro compound Steel surfaces; strong repulsive force to water droplets; multifunctionality (superhydrophobic, UV resistance and anti-corrosion properties) [62] Multilayered sol-gel nanocoatings based on graphene oxide and fluorinated polymeric chains Aluminum alloy (6061T6); multifunctionality (high hydrophobic behavior; anticorrosion properties and good scratch-resistance) [63] Smart nanocontainers with a special acid/alkali dual-stimuli release property Aluminum alloy; multifunctionality (self-healing and superhydrophobic surfaces) [67] layer-by-layer assembly Non-flat substrates of aluminum heat sink; multifunctionality (self-healing and superhydrophobic surfaces) [71] Electrospun PVDF-ZnO Aluminum substrate; multifunctionality (superhydrophobic behavior and corrosion protection) [73] Electrospun PS Carbon steel; multifunctionality (superhydrophobic behavior and excellent anticorrosion protection) [74] Electrospun PANI-PMMA Carbon steel sheet; excellent protection performance with a highly hydrophobic behavior [75] …”

Section: Precursor Applications and Functional Characteristicsmentioning

confidence: 99%

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

et al. 2018

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This review reports the implementation of novel nanostructured functional coatings by using different surface engineering techniques based on wet chemistry. In the first section, the theoretical fundaments of three techniques such as sol-gel process, layer-by-layer (LbL) assembly and electrospinning will be briefly described. In the second section, selected applications in different potential fields will be presented gathering relevant properties such as superhydrophobicity, biocide behavior or applications in the field of optical fiber sensors.

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Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

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This chapter gives an overview over preparation, properties, and applications of alumina thin films. The preparation of polymeric and colloidal alumina sols and their deposition on diverse substrate materials with different geometries are described first. Consideration of properties (surface tension, particle size, viscosity, aging of the sols, and their optimization by using certain additives) is included, too. A description of posttreatments of the coatings, which initiate phase transformations and also determine their microstructure, completes the part on coating preparation. Data on adhesion, thickness, surface roughness, and mechanical, textural as well as optical properties of alumina thin films are provided in a further paragraph. In a third main part, experience concerning possible applications, such as (i) membranes for catalysis, separation, and filtration, (ii) barrier layers against electrochemical and high-temperature corrosion or interdiffusion of ions between different phases, (iii) mechanical protection, (iv) sensor construction, (v) improvement of optical properties, as well as (vi) achieving water repellency, is summarized.

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Sol–gel route for the building up of superhydrophobic nanostructured hybrid-coatings on copper surfaces

Cited by 31 publications

References 39 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Alumina Thin Films

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