The Synthesis of a Superhydrophobic and Thermal Stable Silica Coating via Sol-Gel Process

Vidal, Karmele; Gómez, Estíbaliz; Goitandia, Amaia M.; Angulo-Ibáñez, Adrián; Aranzabe, Estíbaliz

doi:10.3390/coatings9100627

Cited by 53 publications

(20 citation statements)

References 44 publications

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“…The inorganic silica coating conferred no hydrophobicity to the dyed (C‐D‐TEOS) or undyed (C‐TEOS) cotton. This was attributed to the presence of surface‐active hydroxyl (–OH) end groups 30 in the silica itself, making it inherently hydrophilic. Even without sol‐gel coating, iron(II) sulphate post‐mordanting improved the hydrophobicity of samples C‐D‐F, producing a contact angle of approximately 140° and a wetting time of 12 seconds.…”

Section: Resultsmentioning

confidence: 99%

“…OCT produced a slightly more hydrophobic finish on the cotton than PHY, attributed to its longer alkyl chains. Mahltig 27 reported an inverse relationship between chain length and water uptake, with chains of up to 12 carbon atoms producing larger contact angles. Their blended cotton/polyester samples showed higher hydrophobicity when treated with OCT than with PHY.…”

Section: Resultsmentioning

confidence: 99%

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The effect of iron mordanting and sol‐gel coating on the hydrophobicity and colour properties of cotton fabrics dyed with natural tannin

Pisitsak

2020

Coloration Technology

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Cotton fabrics were dyed with natural tannin and post‐treated with a metallic salt mordant and/or sol‐gel coating. The effects on colour properties and hydrophobicity were studied. Pad‐dyeing was carried out using a reddish‐brown, tannin‐rich dye. Some samples were then post‐mordanted with iron(II) sulphate. Samples were sol‐gel coated using tetraethyl orthosilicate (TEOS) with small amounts of organically modified alkoxysilane precursors phenyltriethoxysilane (PHY) and n‐octyltriethoxysilane (OCT) to impart hydrophobicity, and with 3‐(glycidoxypropyl)‐trimethoxysilane (GLY) to improve adhesion between the coating and the fabric. The colour parameters were analysed in the CIELab colour space. Dyed samples appeared reddish‐brown, with the exception of those post‐mordanted with iron(II) sulphate, which were dark brown. Sol‐gel coating with hydrophobic alkyltriethoxysilanes (PHY or OCT) increased the hydrophobicity of the undyed fabrics, increasing contact angle values and drop absorption times. However, this hydrophobic sol‐gel coating alone failed to impart hydrophobicity to the dyed fabrics. Post‐mordanting with iron(II) sulphate was more effective in improving the hydrophobicity of the dyed fabrics than sol‐gel coating. Only the dyed sample treated with both iron(II) sulphate and OCT completely prevented absorption of water droplets. Sol‐gel coating was found to improve colour fastness to washing, light, and crocking. Post‐mordanting with iron(II) sulphate improved colour fastness to washing and light, but not to crocking.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The effect of iron mordanting and sol‐gel coating on the hydrophobicity and colour properties of cotton fabrics dyed with natural tannin

Pisitsak

2020

Coloration Technology

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“…An intermediate state, where the liquid partially wets the surface is also commonly encountered [6]. The chemical modification of metallic surfaces to render them hydrophobic has been investigated using different methods like the sol-gel method [7,8], direct immersion in a reactive hydrophobic solution [9], electrodeposition [10], thermal plasma evaporation [11], and Plasma Enhanced-Chemical Vapor Deposition (PE-CVD) [12].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Hydrophobic Porous Metallic Membranes for High Temperature Applications

et al. 2021

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Hydrophobic porous metallic membranes can be integrated in a microreactor for in situ separation of steam at high temperatures. This study investigates the fabrication and characterization of hydrophobic coatings on metallic substrates. Two different coating methods were explored: (1) Plasma Enhanced—Chemical Vapor Deposition (PE-CVD) to form amorphous carbon silicon-doped a-C:H:Si:O thin films and (2) Direct Immersion in fluoroalkyl silane (FAS-13) solution using dip coating to form Self-Assembled Monolayers. The results on wettability as well as SEM images and EDS/WDS analyses indicate that the coated sintered stainless steel membranes are adequate as hydrophobic surfaces, maintaining the porosity of the substrate and withstanding high temperatures. Especially the FAS-13 coating shows very good resistance to temperatures higher than 250 °C. These findings are of special significance for the fabrication of porous metal membranes for separation of steam in high temperature applications.

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“…With a high water contact angle (WCA, >150 • ), and a low sliding angle (SA, <10 • ), superhydrophobic surfaces, inspired by natural creatures, have attracted extensive attention in academia [1,2]. Many methods, such as electrospinning [3,4], sol-gel [5][6][7], etching [8][9][10], hydrothermal [11,12], self-assembly [13,14] and template methods [15,16], have been used to prepare superhydrophobic surfaces. With the development of superhydrophobic technology, a single superhydrophobic surface cannot meet our requirements.…”

Section: Introductionmentioning

confidence: 99%

One-Step Methods to Fabricate Durable Superhydrophobic Coatings for Flexible Electronic Sensors

et al. 2021

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Inspired by lotus leaves in nature, superhydrophobic surfaces have attracted extensive attention in many fields. However, their complex preparation process, poor durability and high cost seriously restrict their large-scale application in industrial production. Based on the good flexibility and durability of carbon nanofibers, several simple modifier-free one-step approaches were adopted to fabricate a durable CNF/PVDF/PDMS conductive superhydrophobic coating. The fabricated coating not only possesses good superhydrophobicity to many kinds of liquids, but also has excellent self-cleaning and anti-fouling properties. In addition, the superhydrophobicity of the obtained multifunctional coating is stable even after harsh bending fatigue deformation, long immersion times and high-temperature treatment. Due to its strong adhesion and excellent conductivity, the CNF/PVDF/PDMS coating displays reliable mechanical stability and superior sensitivity. These distinct features make the obtained conductive superhydrophobic coating a good candidate for multifunctional smart sensors, with great application prospects in gesture detectors, waterproof wearable electronics and health monitors.

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The Synthesis of a Superhydrophobic and Thermal Stable Silica Coating via Sol-Gel Process

Cited by 53 publications

References 44 publications

The effect of iron mordanting and sol‐gel coating on the hydrophobicity and colour properties of cotton fabrics dyed with natural tannin

The effect of iron mordanting and sol‐gel coating on the hydrophobicity and colour properties of cotton fabrics dyed with natural tannin

Fabrication and Characterization of Hydrophobic Porous Metallic Membranes for High Temperature Applications

One-Step Methods to Fabricate Durable Superhydrophobic Coatings for Flexible Electronic Sensors

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