Effect of heterogeneity on hydro/ice-phobic properties of alkylsilane/fluoro-alkylsilane-based coatings on Al substrates

Arianpour, Faranak; Farhadi, Shahram; Farzaneh, M.

doi:10.1007/s11998-016-9819-z

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…Various silicone and fluoroalkyl-modified materials have been used as agents for the modification of surfaces in the different fields of coatings, films, adhesives, and fibers, due to their hydrophobic/super-hydrophobic properties [13][14][15]. Oldani et al [13] indicated that the sol-gel method was successfully used for the synthesis of silica combined with tetraethyl orthosilicate and a perfluoropolyether.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hybrid Films Based on Fluorinated Silica Materials Prepared by Sol–Gel Processing

et al. 2022

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In this research, fluorinated silica materials were prepared through sol–gel processing with tetraethylorthosilicate (TEOS), triethoxymethylsilane (MTES), and trimethoxyhexadecylsilane (HDTMES), using a fluorinated solution (FS) under acidic medium. The fluorinated solution (FS) was obtained by diluting the perfluorooctanoic acid (PFOA) in 2-propanol. These fluorinated sol–gel silica materials were placed on the glass surfaces in order to achieve the antireflective and hydrophobic fluorinated hybrid films. The structure and surface properties of the final samples were investigated by Fourier transform infrared spectroscopy (FTIR), ultraviolet/visible spectroscopy, thermogravimetric analysis (TGA), atomic force microscopy (AFM), and contact angle (CA) determinations. FTIR spectra demonstrated the presence of a silica network modified with alkyl and fluoroalkyl groups. Thermal analysis showed that the fluorinated sol–gel silica materials prepared with HDTMES have a good thermostability in comparison with other samples. Ultraviolet/visible spectra indicated that the fluorinated hybrid films present a reflectance of ~9.5%, measured at 550 nm. The water contact angle analysis found that the wettability of fluorinated hybrid films was changed from hydrophilic (64°) to hydrophobic (~104°). These hybrid films based on fluorinated sol–gel silica materials can be useful in various electronics and optics fields.

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Section: Introductionmentioning

confidence: 99%

Investigation of Hybrid Films Based on Fluorinated Silica Materials Prepared by Sol–Gel Processing

et al. 2022

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“…Fluorinated silicon compounds are known to be used for functionalized coat-ing fabrication but they are mainly applied at steel substrates for corrosion protection [23]. Other types of fluoroalkyl-modified resins are used on anti-fouling [24] and anti-icing surfaces [25], where the superhydrophobic properties of the coatings are crucial [26]. Fluorinated structures work well for these applications, especially when nanocomposite materials are prepared [27] or the surface of the coating is additionally textured with a laser [28].…”

Section: Introductionmentioning

confidence: 99%

Structural and Functional Properties of Fluorinated Silica Hybrid Barrier Layers on Flexible Polymeric Foil

et al. 2021

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The reported work was focused on sol–gel-derived organically modified and fluorinated silica coatings deposited on elastic polymeric foil. The structure and topography of the coatings were tested by infrared spectroscopy and microscopic studies. The functional properties were determined using thermal analysis, surface analysis, and oxygen permeability tests. The barrier feature of the investigated materials against oxygen was correlated with the properties of the coatings. The hybrid (organic–inorganic) structure of the coatings was proven, demonstrating the presence of a silica network modified with alkyl and fluoroalkyl groups since precursors with the isooctyl group or different lengths of the fluoroalkyl chains were used for the syntheses. The coatings were free of defects and had a smooth surface except for the sample containing the longest fluoroalkyl chain (perfluorododecyl group), which showed a wrinkle-like surface. The hydrophobic character of the coatings increased, whereas the oxygen permeation coefficient values decreased (reaching a fourfold lower coefficient in comparison to the bare substrate) with a higher content of the fluorinated carbon atoms in the structure. The results were enriched by the information from the thermomechanical analysis as well as nanoindentation and scratch tests giving values of the glass transition temperature, thermal expansion coefficient, coatings adhesion, and hardness of the investigated systems.

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“…In the last years, research groups published several papers on the fabrication of superhydrophobic surfaces on not anodized Al and Al alloys to enhance corrosion resistance. [27][28][29][30][31] However, the proposed treatments are often based on the deposition of fluorinated chemicals (e.g., fluoroacrylic copolymers, fluoroalkyl silanes) that can be dangerous for human health 32 and, not least, their application on the metallic substrate is not easily implementable in the current Al treatment industrial processes. An alternative route can be the electrodeposition of F-free coatings, which can be simply designed to be integrated into the anodizing plants.…”

mentioning

confidence: 99%

Double Step Electrochemical Process for the Deposition of Superhydrophobic Coatings for Enhanced Corrosion Resistance

Franco

Zaffora

Vassallo

et al. 2021

J. Electrochem. Soc.

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Superhydrophobic surface on anodized AA5083 sample was obtained by an electrochemical process. Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy analyses revealed the hierarchical structure of the coating and the presence of manganese stearate. These features were crucial for the coating superhydrophobicity, demonstrated by a measured contact angle of ∼163° and its self-cleaning ability. Electrochemical characterization in an aqueous solution mimicking seawater proved an enhanced corrosion resistance due to the superhydrophobic coating with respect to anodized AA5083 sample that also lasted after 20 immersion days in Cl− containing electrolyte.

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Effect of heterogeneity on hydro/ice-phobic properties of alkylsilane/fluoro-alkylsilane-based coatings on Al substrates

Cited by 7 publications

References 35 publications

Investigation of Hybrid Films Based on Fluorinated Silica Materials Prepared by Sol–Gel Processing

Investigation of Hybrid Films Based on Fluorinated Silica Materials Prepared by Sol–Gel Processing

Structural and Functional Properties of Fluorinated Silica Hybrid Barrier Layers on Flexible Polymeric Foil

Double Step Electrochemical Process for the Deposition of Superhydrophobic Coatings for Enhanced Corrosion Resistance

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