Synthesis and Characterization of ZnO-SiO2/Epoxy Nanocomposite Coating by Sol-Gel Process

2012 ◽  
Vol 16 ◽  
pp. 1-7
Author(s):  
Nazanin Farhadyar ◽  
Mirabdullah Seyed Sadjadi
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Nanocomposite Coating ◽  
Contact Angles ◽  
Hybrid Coatings ◽  
Coating Film ◽  
Water Contact ◽  
Unit Form ◽  
Hybrid Solution ◽  
Sol Gel Process

In this paper, we report preparation of hydrophilic hybrid nanocomposite coatings on glass substrates using Zinc acetate solutions based on 3-glycidoxypropyltrimethoxysilane (GPTMS), epoxy resin, aromatic amine (HY850), polyethylene glycol (PEG) and surfactant (polyoxyethylene(4)laurylether) by the sol-gel process. Furthermore, the effects of PEG addition to the precursor solutions on the hydrophilic property and microstructure of the resultant coating film were studied. The hydrophilic behavior study of the synthesized hybrid was performed by adding different amounts of polyethylene glycol precursor to the hybrid solution. Experimental results show that, among different amounts of PEGs, the best results are obtained by addition of PEGs (400) to the hybrid solution which can decrease the water contact angles down to 16 and using surfactant down to 0, and increase the free surface energy. Coated glass exhibits a higher strength than uncoated glass. Attenuated total reflectance infrared spectroscopic (ATR-IR) technique was used to characterize the structure of the hybrid films. The chemical structure of obtained network affects morphology of the coating. The morphology of the hybrid coatings was examined by transmission electron microscopy (TEM). The hybrid systems have a unit form structure and the inorganic phases were in the nanosize scale,

scholarly journals Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

2021 ◽  
Vol 11 (22) ◽  
pp. 11044
Author(s):  
Violeta Purcar ◽  
Valentin Rădițoiu ◽  
Alina Rădițoiu ◽  
Florentina Monica Raduly ◽  
Georgiana Cornelia Ispas ◽  
...  
Keyword(s):  
Polyvinyl Chloride ◽  
Sol Gel ◽  
Contact Angles ◽  
Hybrid Coatings ◽  
Water Contact ◽  
Silica Coatings ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Silica Materials ◽  
Window Blinds

In this research, we report a simple and inexpensive way to prepare transparent and hydrophobic hybrid coatings through deposition of different silica materials on polyvinyl chloride (PVC) substrates. The silica materials were prepared using an acid-catalyzed sol–gel method at room temperature (25 ± 2 °C), using alkoxysilanes: tetraethoxysilane (TEOS), as the silica source, and ethoxydimethylvinylsilane (DMVES), triethoxyoctylsilane (OTES), and trimethoxyhexadecylsilane (HDTMES), as modifier agents. The obtained materials were characterized (either as powders or as thin films) by Fourier-transform infrared spectroscopy (FTIR), UV/Vis spectroscopy, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), atomic force microscopy (AFM), spectroscopic ellipsometry (SE), and water contact-angle measurements. UV/Vis spectra showed that the PVC substrate coated with the silica material containing TEOS/DMVES/OTES had a transmittance of about 90% in the wavelength range of 650–780 nm. The water contact angles increased from 83° for uncoated PVC substrate to ~94° for PVC substrates coated with the sol–gel silica materials. These PVC films with hybrid silica coatings can be used as the materials for outdoor applications, such as energy-generating solar panel window blinds or PVC clear Windmaster outdoor blinds.

Fabrication of Superhydrophobic Surface of TiO2 through Sol-Gel Process on Stainless Steel Substrate

2012 ◽  
Vol 512-515 ◽  
pp. 1032-1035 ◽  
Author(s):  
Ya Wei Hu ◽  
Hui Rong He ◽  
Yang Min Ma
Keyword(s):  
Stainless Steel ◽  
Steel Substrate ◽  
Sol Gel ◽  
Dip Coating ◽  
Contact Angles ◽  
Tio2 Coating ◽  
Crystallographic Structure ◽  
Stainless Steel Surface ◽  
Water Contact ◽  
Sol Gel Process

Nano-structured TiO2 coating was constructed through sol-gel process and dip-coating method on the stainless steel surface using tetra-n-butyl titanate as precursor. The phase and the crystallographic structure of the TiO2 coating were characterized by an X-ray diffractometer (XRD), and the surface topography and structures of the TiO2 coating were characterized by a scanning electron microscope (SEM). The superhydrophobic property of the TiO2 coating modified with the fluoroalkylsilane (FAS, CF3(CF2)7CH2CH2Si(OCH3)3) was characterized by the water contact angles. It was observed that the TiO2 coating showed superhydrophobicity with water contact angle 155.3° after modifying with FAS, and the superhydrophobicity was corrosion-resistance.

scholarly journals Influence of Fluorine-Containing Monomer Content on the Hydrophobic and Transparent Properties of Nanohybrid Silica Polyacrylate Coating Materials

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4261
Author(s):  
Chih-Ming Huang ◽  
Her-Yung Wang ◽  
Sing-Yuan Fang ◽  
Wein-Duo Yang
Keyword(s):  
Sol Gel ◽  
Weight Ratio ◽  
Hybrid Coating ◽  
Coating Film ◽  
Hydrophobic Properties ◽  
Coating Materials ◽  
Water Contact ◽  
Light Region ◽  
Sol Gel Process ◽  
Monomer Content

Nanosilica-modified, fluorine-containing polyacrylate hybrid coating materials, consisting of dodecafluoroheptyl methacrylate (DFMA), methyl methacrylate (MMA), 2-ethyl hexyl acrylate (2-EHA), 3-(trimethoxysilyl) propyl methacrylate (KH-570), and tetraethylorthosilicate (TEOS), are synthesized successfully by free radical polymerization and the sol–gel process. It is revealed that the content of the fluorine-containing polyacrylate hybrid coating materials from DFMA monomers significantly improves the properties of the films. The polyacrylate coating film prepared with a weight ratio of DFMA/MMA at 1:5 exhibits the largest water contact angle of 105.4°, which demonstrates that DFMA can effectively improve the hydrophobicity of the coating film. Moreover, the silicon coupling agent (KH-570) is used to graft silica with acrylate. Spherical in shape, the surface morphology of the nanohybrid film exhibits a core–shell structure, which increases the surface roughness and enhances the hydrophobic properties. The as-prepared fluorine-containing nanohybrid silica polyacrylate film possesses a high transmittance of 89–97% in the visible light region, indicating its potential as a very attractive solution in many practical areas.

Infrared Characterization of PMMA-SiO2 Hybrid Glasses Obtained by Sol-Gel Process

2010 ◽  
Vol 1278 ◽  
Author(s):  
L.L. Díaz-Flores ◽  
A. S. López Rodríguez ◽  
P. SifuentesGallardo ◽  
M.A. Hernàndez Rivera ◽  
M.a Garnica Romo ◽  
...  
Keyword(s):  
Sol Gel ◽  
Chemical Properties ◽  
Hybrid Coatings ◽  
Force Microscopy ◽  
Air Atmosphere ◽  
Atomic Force ◽  
Sol Gel Process ◽  
Traditional Process ◽  
And Chemical Properties

AbstractThis work is about the production of hybrid coatings of the system SiO2-PMMA (PMMA, polymethylmethacrylate). These materials have interesting mechanical and chemical properties useful for anticorrosive and wear resistance applications. SiO2-PMMA hybrids were obtained by the sol-gel traditional process, using tetraethylorthosilicate (TEOS) and methylmethacrylate (MMA) by Aldrich Co, as starting reagents. The SiO2:PMMA ratio was varied from 0:1 to about 1:1 at air atmosphere deposition. The coatings were obtained on acrylic sheets and silicon wafers. A diversity of coatings with chemical composition ranging from SiO2 and PMMA to obtain the SiO2-PMMA hybrids were obtained. Infrared (IR) and atomic force microscopy (AFM), were performed to determinate structural and morphological behavior.

Preparation of ZrC/SiC porous self-supporting monoliths via sol-gel process using polyethylene glycol as phase separation inducer

2018 ◽  
Vol 38 (14) ◽  
pp. 4806-4813 ◽  
Author(s):  
Fei Li ◽  
Xin-Gang Wang ◽  
Xiao Huang ◽  
Ji-Xuan Liu ◽  
Weichao Bao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polyethylene Glycol ◽  
Sol Gel ◽  
Sol Gel Process

Preparation of TiO2 Thin Films and its Superhydrophilic Properties

2009 ◽  
Vol 620-622 ◽  
pp. 695-698
Author(s):  
Jing Ma ◽  
Wen Xiu Liu ◽  
Xiao Guang Qu ◽  
Dan Ni Yu ◽  
Wen Bin Cao
Keyword(s):  
Thin Film ◽  
Tio2 Thin Film ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Soda Lime ◽  
Contact Angles ◽  
Soda Lime Glass ◽  
Water Contact ◽  
Different Temperatures ◽  
Hydrolysis Of

TiO2 thin film was prepared on soda lime glass by hydrolysis of Ti(OC4H9)4 in alcoholic solutions by sol-gel method combined with spin-coating and calcination different temperatures. Prepared samples were characterized by XRD, FESEM, and measurement of contact angles and transmittance. XRD identification reveals that the films are composed of anatase TiO2 when the annealing temperature was set at 450~550 oC. SiO2 layer was coated on the surface of the glass firstly to barrier the diffusing of sodium ions from the substrate. Light-induced superhydrophilicity of the TiO2 thin film has been investigated. To increase the illumination light intensity will decrease the water contact angle. The superhydrophilicity of the TiO2 thin film will disappear more slowly in the dark than that in the field of ultrasound.

scholarly journals Immobilization of Lipase CALB in Organically Modified Silica

2020 ◽  
Vol 11 (1) ◽  
pp. 7814-7825 ◽  
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Reaction Medium ◽  
Sol Gel Process ◽  
Yield Values ◽  
Activity Of Enzymes ◽  
Esterification Activity ◽  
Candida Antarctica B ◽  
The Mathematical Model ◽  
Commercial Lipase

In order to improve the activity of enzymes immobilized in silica, additives such as polyethylene glycol (PEG) can be introduced in the sol-gel process. This addition aims to protect the enzymes from denaturing effects by forming protection between the protein and the reaction medium. Thus, the aim of the work was to evaluate the effect of the use of the PEG additive in the process of immobilization of the commercial lipase of Candida antarctica B (CALB) in xerogel and aerogel obtained by the sol-gel technique. The mathematical model for the process was validated, and the optimum points determined were 0.09 g/ml of enzyme and 0.15 g/ml of polyethylene glycol additive for the xerogel and 0.12 g/ml of enzyme and 0.20 g/mL of polyethylene glycol additive for the aerogel. The maximum esterification activity and yield values were 544 U/g, 585%, and 266 U/g, 140% for xerogel and aerogel, respectively. Polyethylene glycol showed better performance in the esterification activity and stability as an additive when used in the xerogel, that is, when the process of obtaining the support uses the removal of the solvent only by evaporation. Regarding aerogel, a reduction in enzyme activity was observed, which may be due to the interaction of PEG with CO2 in the drying process.

scholarly journals Facile Approach to Develop Hierarchical Roughness fiber@SiO2 Blocks for Superhydrophobic Paper

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1393 ◽  
Author(s):  
Qing Wang ◽  
Jieyi Xiong ◽  
Guangxue Chen ◽  
Ouyang Xinping ◽  
Zhaohui Yu ◽  
...  
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Contact Angles ◽  
Preparation Process ◽  
Water Contact ◽  
Mechanical Durability ◽  
Complex Preparation ◽  
Superhydrophobic Paper

Papers with nanoscaled surface roughness and hydrophobically modification have been widely used in daily life. However, the relatively complex preparation process, high costs and harmful compounds have largely limited their applications. This research aims to fabricate superhydrophobic papers with low cost and nontoxic materials. The surface of cellulose fibers was initially coated with a film of SiO2 nanoparticles via sol-gel process. After papermaking and subsequent modification with hexadecyltrimethoxysilane through a simple solution-immersion process, the paper showed excellent superhydrophobic properties, with water contact angles (WCA) larger than 150°. Moreover, the prepared paper also showed superior mechanical durability against 10 times of deformation. The whole preparation process was carried out in a mild environment, with no intricate instruments or toxic chemicals, which has the potential of large-scale industrial production and application.

THE STABILITY OF SUPERHYDROPHOBIC COTTON FABRICS PREPARED BY SOL–GEL COATING OF SiO2 AND TiO2

2013 ◽  
Vol 20 (06) ◽  
pp. 1350064 ◽  
Author(s):  
XUE-WEI WANG ◽  
CUI GUO ◽  
ZHI-HAO YUAN
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Volume Ratio ◽  
Sodium Silicate Solution ◽  
Cotton Fabrics ◽  
Contact Angles ◽  
Light Irradiation ◽  
Water Contact ◽  
Uv Light Irradiation ◽  
Silica And Titania

Superhydrophobic cotton fabrics are prepared using silica and titania hybrid sol and hexadecyltrimethoxysilane. The surface morphology of cotton fabrics is characterized by scanning electron microscopy. The water contact angles on the as-prepared superhydrophobic cotton fabrics is 159° when the volume ratio between sodium silicate solution and titania sol is 1:3, and the corresponding cotton fabrics can keep the contact angle of 152° after 10 cycles of home machine washing. Meanwhile the treated cotton fabrics can also keep superhydrophobicity after 60 min of UV light irradiation. These results indicate that the cotton fabrics treated with silica and titania hybrid sol and modified with hexadecyltrimethoxysilane show excellent superhydrophobic stability under washing and UV light irradiation. This paper provides the new notion and beneficial reference for the application of the superhydrophobic cotton fabrics in the future.

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