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This study defines the preparation and characterization of organic–inorganic hybrid films that contain fluorine. Diurethane dimethacrylate (DUDMA) was used as the organic portion, and 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (FTS) and 3-(trimethoxysilyl) propyl methacrylate (MEMO) were used as the inorganically rich portion. MEMO, found in the...
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Context 1
... FT-IR spectra that have been obtained initially and after polymerization for the film solutions prepared in Fig. 2 have been ...
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... Fig. 2 is examined, peaks for the alkyl groups are seen at the 2900-3000 cm −1 . The asymmetric C-H stretching peak for the methyl group is seen at 2960 cm −1 , and the C-H stretching peak for the methylene -C-group is observed at 2874 cm −1 . The wavenumber, which is the other clearest peak, is the stretching vibration peak for the carbonyl ...
Citations
... With the development of combined coating technology, hybrid coatings can be obtained through a dual curing process, in which the sol-gel reaction of inorganic precursors is combined with the photopolymerization of reactive monomers/oligomers (Kesmez 2019). This photopolymerization or UV-curing process involves low energy consumption, rapid curing speed, non-requirement of organic solvents, and is more environmentally friendly, durable, and does not require secondary processing compared with traditional surface spraying of resin paints. ...
This study demonstrated an effective method to enhance the dimensional stability of straw-based biocomposites with modified lignosulfonate as a binder. The ultraviolet (UV) light-curable nanosol was prepared by adding 3-(trimethoxysilyl)propyl methacrylate (MEMO) as sol–gel precursor into polyvinyl alcohol (PVA) solution. The MEMO/PVA coatings were generated using 2-hydroxy-2-methyl-1-phenylpropan-1-one (Darocur 1173) as radical photo-initiator and chitosan (CS) as additive, on straw-based biocomposites via UV-curing process. The effects of the crucial steps, such as the UV-curing process, hydrolysis time, Darocur 1173 dosage, and CS dosage on the dimensional stability of straw-based biocomposites, were evaluated. The optimum preparation parameters, obtained using the Box–Behnken design, were 31.9 min hydrolysis time, 4.5% Darocur 1173 dosage, and 2.7% CS dosage. Moisture resistance of minimum TS of CS-MEMO/PVA-coated straw-based biocomposites resulted in ~23.1% reduction in dimensional stability without significant decline in the mechanical properties when compared with those without UV curing. Moreover, the glossy spherical particles underwent arrangement in a fish-scale shape with scales closely linked with each other and no agglomeration occurred in CS-MEMO/PVA hybrid film. The CS promoted the cross-linking of MEMO/PVA coating on the biocomposite surface. The resulting biocomposites can be directly applied to public humid-environment applications such as bath furniture and bathroom partitions.
... On the other hand, we studied the addition of a fluoro-compound with a low surface energy in the appropriate step of the formulation to convert the previously designed coating onto a hydrophobic surface, thereby easily achieving a new functionality for different materials just by adding an extra additive. There are few examples in the literature for this kind of UV-curable coating [23,24], but all of them are focused exclusively on the coating of plastics such as polymethyl methacrylate or polycarbonate, and not applicable to metallic surfaces, requiring an extra step of heating before UV curing and applied by different methods in small samples. ...
Current methods for the hardening step of functional coatings over different materials imply the use of high temperatures, high energy consumption or long periods of time, which have repercussions on the speed and cost of the product. We report here a simple and low-cost methodology for the functionalization of low-cost stainless steel, which is modular, depending on the functionality pursued: a levelling layer for smoothing the surface of the material, an “easy to clean” property, or both of them. This research is based on sol-gel coatings cured under UV light without requiring high thermal hardening processes, making it applicable to plastics and other sensible materials and possessing high chemical and thermal stability. The film ensures lower processing costs and higher rates of hardening if adequate medium-pressure lamps are employed. This formulation is also well-defined for scaling up the process, so it is possible to perform a continuous coating in large areas by employing mild processing conditions (low temperature, atmospheric pressure). In addition, the sol-gel solution was fully characterized and studied in order to guarantee a long service life before deposition, with a focus on industrial applications in the domestic sector.
... In the past few decades, thin sol gel hybrid coating films have become a focus in functional coating materials research owing to their unique and significant properties. These materials combine the flexibility of organic precursor with the hard and thermally stable of ceramic fillers (Kesmez, 2019). The sol gel process is relevant method to synthesize organic-inorganic hybrid films and overcome the difficulty of thermodynamic low affinity of its phase. ...
The sol gel films that were coated on glass microslide surface was prepared by facile sol-gel method and enhanced with UV curing. The UV curing is an alternative step instead of solely rely on heat treatment which is industrially unfriendly due to time consuming that is encountered during annealing process. The hydrophobicity phenomenon is governed by synergistic effect of roughness filler created by random distribution of nanosilica as well as low surface energy attributed by long chain fluoroalkylsilane. The contact angle obtained is above 150 o and the degree of transparency is in the range of 85-90% which was measured by UV-Vis spectroscopy. The chemical composition was evaluated by FTIR spectroscopy and it shows the presence of Si-O-C peak that indicates the fluoroalkylsilane peak is successfully attached to nanosilica thus created hydrophobic surface. The surface topography was analyzed with AFM that gives confirmation that uniform distribution of nanosilica on microslide surface.
... Humidity and UV irradiation tests were carried out for durability of hydrophobic coated samples according to the procedure reported previously (Kesmez 2019). The films were exposed to a relative humidity of > 90%, at 60 °C for a duration of 720 h. ...
In this study, fluoro-functionalized hydrophobic/oleophobic hybrid nanocomposite coatings, which are highly resistant and transparent, long-lasting and mechanically stable, have been deposited on metal substrate surfaces by the sol–gel method. Organic–inorganic hybrid matrix was prepared using tetraethoxysilane and organically modified silicon alkoxide, namely 3-(glycidyloxypropyl) trimethoxysilane. Additionally, to increase hydrophobic behavior, a fluorinated silica-alkoxide precursor and AlO(OH) NPs were added to the hybrid matrix. Water and n-hexadecane contact angle, surface morphologies, thicknesses and surface roughness of the films were determined. Additionally, optical characterizations and mechanical properties of the films such as light transmittance, haze, clarity, gloss were investigated. A salt spray corrosion test and electrochemical corrosion measurements were also performed. Optimum properties were acquired in the hydrophobic hybrid nanocomposite coating containing 15 wt% of 3 nm AlO(OH) NPs.
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Hybrid organic-inorganic, photocatalytic nanocomposite coatings that containing novel 1,2,4-triazole based Cu(II) and Zn(II) phthalocyanines modified TiO2 nanoparticles were developed with the sol-gel process. Tetraethyl orthosilicate, 3-(glycidyloxypropyl)triethoxysilane and triethoxymethylsilane were used for hybrid polymer network. The phthalocyanines modified TiO2 nanoparticles prepared by the sol-gel method were added to the obtained hybrid polymer network at of 10%, 25%, and 50%, and the glass substrates were coated the obtained coating solutions by spray method. The photocatalytic activity, optical characterization, morphological and mechanical properties of the coated glass surfaces were examined. The adhesions of the obtained films were classified as 5B, and the pencil and newton hardness were > 9H and 2.6 N, respectively. This study acquired photocatalytic hybrid nanocomposite films that are highly transparent and do not have color changes and that also exhibit hight photocatalytic activitiy.
Hybrid organic-inorganic, hydrophobic and photocatalytic nanocomposite coatings that include Ce doped TiO2 nanoparticles (c-TiO2 NPs) were developed with the sol-gel process. The inclusion of c-TiO2 NPs in hydrophobic coatings was also proven to be able to exhibit self-cleaning performance. Tetraethyl orthosilicate and 3-glycidyloxypropyl)trimethoxysilane were used for hybrid polymer network. The 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane precursor was used to develop hydrophobic behaviors. The c-TiO2 NPs prepared with the sol-gel method were added to the obtained hybrid polymer network at rates of 10%, 20%, 40%, and 60%, and the coating solutions were deposited to the glass substrates by spray method. The obtained nanocomposite coatings were cured at 160 °C. The self-cleaning properties, wetting behaviors, optical characterization, morphological and mechanical properties of the acquired coating surfaces were examined. The adhesions of the obtained films were classified as 5 B, and the pencil and newton hardness were 9H and 2.4 N, respectively. This study acquired photocatalytic hybrid nanocomposite films that are highly transparent and do not have color changes noticeable with the naked eye and that also exhibit oleophobic properties. Thanks to low-curing temperatures, there was no need for any barrier coating between the applied film and the glass for ion diffusion to obtained films.
