Sol-Gel Preparation of Optically Transparent Hydrophobic Hybrid Coating

2011 ◽  
Vol 391-392 ◽  
pp. 505-510
Author(s):  
Yan Pang ◽  
Yao Chen ◽  
Qi Qiu ◽  
Fang Wang ◽  
Zhang Tao
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sol Gel ◽  
Weight Ratio ◽  
Hybrid Coating ◽  
Molar Ratio ◽  
Water Contact ◽  
Glass Slides ◽  
Optically Transparent ◽  
Gel Preparation

Optically transparent hydrophobic inorganic-organic hybrid sols was obtained employing Tetraethylorthosilicate (TEOS), Methyltriethoxysilane (MTES), and Heptadecafluoro-1, 1, 2, 2-tetradecyl)trimethoxysilane (FAS), with nitric acid as catalyst. Hybrid coating was dip coated on glass slides. The results showed that the water contact angle of MTES modified SiO2 coating was only 105° . As the weight ratio FAS varied from 0 to 8 wt.%, the water contact angle reached as high as 116.5°. The coated glass presented transmittance of 92%, 2% higher than the non-coated ones. The increase in transmittance suggested an antireflective effect of the hybrid coating. With further SEM characterization of the surface morphology, we finally obtained the optimized optically transparent hydrophobic hybrid coating with the MTES/TEOS_as 1/1(molar ratio) and FAS as 2 wt.%.

Synthesis and Self-Cleaning Property of TiO2 Thin Film Doping with Fe3+, Al3+, Ce3+ Ions

2020 ◽  
Vol 20 (7) ◽  
pp. 4084-4091
Author(s):  
Chun Han ◽  
Lei Zhao ◽  
Manying Zhang ◽  
Lin Pan ◽  
Zhifeng Liu
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Tio2 Thin Film ◽  
Sol Gel ◽  
Molar Ratio ◽  
Water Contact ◽  
Cleaning Performance ◽  
Photogenerated Electrons ◽  
Self Cleaning

Enhancing the response to visible light and inhibiting recombination of photogenerated electrons and holes is a key point for strongly improved self-cleaning performances of TiO2 self-cleaning films. In this work, TiO2 thin film doping with three different ions (Fe3+, Al3+, Ce3+) on glass substrate respectively by sol–gel method to explore the effect of ions on self-cleaning performance of TiO2 thin films. All the prepared samples are characterized by XRD, SEM, UV-Vis and water contact angle tester. Moreover, the self-cleaning mechanism of doping TiO2 thin film is discussed. The water contact angle of TiO2 thin film doping with 9% Fe (molar ratio), 5% Ce and 5% Al are reach at 0°, respectively. In comparison with the water contact angle of pure TiO2 thin film (2.5°), TiO2 thin film doping with metal ions exhibit better self-cleaning property.

Design and fabrication of polydopamine based superhydrophobic fabrics for efficient oil-water separation

Soft Matter ◽  
2021 ◽  
Author(s):  
Jixi Zhang ◽  
Ligui Zhang ◽  
Xiao Gong
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sol Gel ◽  
High Water ◽  
Water Contact ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Fabric Surface

In this work, we prepare a PDMS-SiO2-PDA@fabric with high water contact angle (WCA=155o). Combining dopamine self-polymerization and sol-gel method, SiO2 is in situ grown on a PDA-modified fabric surface to...

Fabrication of Superhydrophobic Films on Aluminum Foils with Controllable Morphologies

2013 ◽  
Vol 641-642 ◽  
pp. 414-417 ◽  
Author(s):  
Yu Zhen Lv ◽  
Le Feng Wang ◽  
Kai Bo Ma ◽  
You Zhou ◽  
Cheng Rong Li
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Solution Method ◽  
Total Concentration ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Simple Solution ◽  
Molar Ratio ◽  
Nitrate Hexahydrate ◽  
Water Contact

In this study, porous architectures with controllable morphologies on Aluminum foils were fabricated by a simple solution method using zinc nitrate hexahydrate and hexamethylenetetramine as reactants. Unlike works reported previously, we show that the porous architectures on the surface of Aluminum foils can be adjusted by controlling the molar ratio and total concentration of reactants, which is proved to be of importance in tailoring the wettability of the surface. It is found that by adjusting the space of pores and the thickness of nanoslices, the water contact angle of the obtained surface can change from hydrophobic to superhydrophobic.

scholarly journals Superhydrophobic organosilicon-based coating system by a novel ultravoilet-curable method

2017 ◽  
Vol 7 ◽  
pp. 184798041770279 ◽  
Author(s):  
Baojiang Liu ◽  
Taizhou Tian ◽  
Jinlong Yao ◽  
Changgen Huang ◽  
Wenjun Tang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Silica Nanoparticles ◽  
Water Contact Angle ◽  
Cotton Fabric ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Water Repellent ◽  
Step Method ◽  
Water Contact

A robust superhydrophobic organosilica sol-gel-based coating on a cotton fabric substrate was successfully fabricated via a cost-effective one-step method. The coating was prepared by modification of silica nanoparticles with siloxane having long alkyl chain that allow to reduce surface energy. The coating on cotton fabric exhibited water contact angle of 151.6°. The surface morphology was evaluated by scanning electron microscopy, and surface chemical composition was measured with X-ray photoelectron spectroscopy. Results showed the enhanced superhydrophobicity that was attributed to the synergistic effect of roughness created by the random distribution of silica nanoparticles and the low surface energy imparted of long-chain alkane siloxane. In addition, the coating also showed excellent durability against washing treatments. Even after washed for 30 times, the specimen still had a water contact angle of 130°, indicating an obvious water-repellent property. With this outstanding property, the robust superhydrophobic coating exhibited a prospective application in textiles and plastics.

Research on the Strengthen of Silicone Rubber

2013 ◽  
Vol 663 ◽  
pp. 377-380 ◽  
Author(s):  
Wen Juan Gu ◽  
Ying Li ◽  
Bang Gui He
Keyword(s):  
Mechanical Property ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Silicone Rubber ◽  
Sol Gel ◽  
Water Contact ◽  
Gel Method ◽  
Sol Gel Method ◽  
Strain Stress ◽  
Strengthen Mechanism

A new kind of microsphere filler was synthesized with octyltrimethoxysilane (WD13) and tetraethoxysilane (TEOS) by sol-gel method. The morphology of the filler was measured by TEM. The so synthesized spheres were added into the silicone rubber. Both the strain-stress and the water contact angle of the silicone rubber were researched. The results showed that both the mechanical property and the hydrophobic performance of the composite were improved compared with the blank specimen. The possible strengthen mechanism of the filler was discussed. The neotype silica sphere researched in this paper could react with the silicone rubber chains which perfects the vulcanization of the silicone rubber. This kind of sphere filler exhibits many merits for usage as filler.

Research on the Formula of Polyaspartic Ester Polyurea Concrete Coating and its Application

2013 ◽  
Vol 423-426 ◽  
pp. 1159-1163 ◽  
Author(s):  
Jing Feng ◽  
Ling Min Liao ◽  
Liang Chen ◽  
Cheng Jing Xiao ◽  
Shan Feng Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Crack Resistance ◽  
Water Contact Angle ◽  
Bonding Strength ◽  
Testing Machine ◽  
Weight Ratio ◽  
Hydrophobic Surface ◽  
Water Contact ◽  
North Water ◽  
Concrete Coating

Its of great importance to develop various outstanding protective concrete coating with favorable impermeability and crack-resistance properties. In this study, the polyaspartic ester polyurea was prepared, and its adhesion to concrete was evaluated by universal testing machine and SEM technology. The optimal formula of polyurea was obtained by investigating the effects of each component's content on the bonding strength to concrete and the water contact angle. Subsequently, the mechanical and surface properties of these polyurea coating were tested. The results showed that the polyurea was obtained by the following formula: the weight ratio of A1/A2/B was 0.612/ 0.408/ 1, and the fluoride filler content was 3%. The coating exhibited excellent mechanical properties, such as high bonding strength (4.5 MPa), sufficient tensile strength (16.4 MPa) and elongation at break (456%). Meanwhile, the coating showed a hydrophobic surface with its water contact angle of 105°. Hence, the polyurea coating is likely to improve the crack-resistance and impermeability properties of hydraulic concrete. Till now, the polyurea coating has been applied to the concrete repair and protection engineering in the South-to-North Water Transfers Project.

The Study of nano-SiO2/Polyacrylate Core-Shell Hybrid Emulsions

2014 ◽  
Vol 881-883 ◽  
pp. 986-989
Author(s):  
Fa Qiu Hou ◽  
Ning Qing ◽  
Yong Jun Chen
Keyword(s):  
Contact Angle ◽  
Fourier Transform ◽  
Glass Transition ◽  
Water Contact Angle ◽  
Sol Gel ◽  
Core Shell ◽  
Water Contact ◽  
Glass Transition Temperatures ◽  
Ft Ir ◽  
Gel Technique

nano-SiO2 modified core-shell polyacrylate composite emulsion was synthesized by seeded semi-continuous starved pre-emulsion polymerization and sol-gel technique. The influence of 3-methacryloxypropyltrimethoxysilane(KH-570), tetraethoxysilane(TEOS) on the properties of emulsion and film were studied. The SiO2/silicone polyacrylate composite latex and the resultant films were characterized by fourier transform infrared spectroscopy(FT-IR), differential scanning calorimeter(DSC), thermogravimetric analysis(TGA), water contact angle goniometer (WCAG). The results showed that organic silicon and nano-SiO2 were effectively grafted to the polyacrylate molecular chain. We can observed there are two glass transition temperatures (Tg) in the DSC curve. The water contact angle (WCA) on the PAE film and SSPAE film separately attained 62.5°and 85.5°.

On Antireflective Coatings with Stable Hydrophobicity for Solar Tube

2013 ◽  
Vol 423-426 ◽  
pp. 443-447 ◽  
Author(s):  
Wen Wen Dou ◽  
Yu Chao Niu ◽  
Xiang Ju Liu ◽  
Xiao Li Wang ◽  
Yong Xu
Keyword(s):  
Contact Angle ◽  
Low Temperature ◽  
Water Contact Angle ◽  
Prolonged Exposure ◽  
Sol Gel ◽  
High Porosity ◽  
Antireflective Coatings ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Static Water

Antireflective coatings with stable hydrophobicity for solar tube were prepared via sol-gel method and hexamethyldisilazane (HMDS) treatment. The coatings have a high porosity, groove-like surface morphology and a big static water contact angle. As a result, the coatings exhibit high transmittance even in high humidity environments. The transmittance peak can reach up to 99.02% which increased by 7% compared with the substrate and the wavelength band increased by more than 5% is from 438nm to 1000nm. After prolonged exposure to strong ultraviolet (UV) irradiation, the static water contact angle of the HMDS treated antireflective coatings decreased very small from 102o to 98o. In addition, the low-temperature tests showed the contact angle did not decline even at-50°C. The results suggest that the coatings prepared in present paper have stable hydrophobic and antireflective performance in the environment of strong UV radiation and low temperature.

scholarly journals Highly thermally resistant hydrophobic poly(vinyl alcohol)-silica hybrid nanofibers

2018 ◽  
Vol 83 (7-8) ◽  
pp. 885-897
Author(s):  
Ugur Hulusi ◽  
Burcu Oktay ◽  
Atilla Gungor ◽  
Nilhan Kayaman-Apohan
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Vinyl Alcohol ◽  
Sol Gel ◽  
Poly Vinyl Alcohol ◽  
Water Mixture ◽  
Sem Images ◽  
Water Contact ◽  
Hybrid Nanofibers ◽  
Silica Precursor

In this paper, the preparation of hydrophobic and crosslinked poly- (vinyl alcohol)/silica organic?inorganic hybrid nanofibers via the sol?gel electrospinning method is reported. Silica was produced through the acetic acid catalyzed reaction of a silica precursor consisting of dimethyldimethoxysilane (DMDMOS), methyltrimethoxysilane (MTMS), tridecafluoro-1,1,2,2-tetrahydrooctyltriethoxysilane (FAS1313; Dynasylan? F 8261) and phenyltrimethoxysilane (PTMS; Dynasylan? 9165) in a 2-propanol?water mixture. Hybrid nanofibers were obtained by electrospinning the silica precursor and an aqueous PVA solution. Chemical, structural, thermal and surface analyses were conducted by Fourier-transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) and water contact angle (WCA) methods, respectively. The obtained hybrid nanofibers were insoluble in aqueous solution. SEM images displayed that highly crosslinked and porous structures were obtained and the average fiber diameters of poly(vinyl alcohol) (PVA)/silica nanocomposites were around 70 nm. A nanofiber surface with a water contact angle of 130? was achieved.

Preparation of Hydrophilic-Oleophobic Antireflective Coatings with High Transmittance

2014 ◽  
Vol 1051 ◽  
pp. 81-84
Author(s):  
Shuang Cai ◽  
Yu Lu Zhang ◽  
Hong Wei Yan ◽  
Hai Bing Lv ◽  
Bo Jiang
Keyword(s):  
Contact Angle ◽  
Refractive Index ◽  
Water Contact Angle ◽  
Organic Molecules ◽  
Weight Ratio ◽  
Antireflective Coatings ◽  
Water Contact ◽  
Acid Catalyzed

In this study, hydrophilic-oleophobic antireflective coatings with high transmittance were prepared via simplely mixing the base-catalyzed TEOS and acid-catalyzed MTES with different weight ratio. The refractive index of the AR coatings increase continuously from 1.23 to 1.44. When the weight ratio of acid-catalyzed MTES reached 60%, a hydrophilic-oleophobic antireflective coatings with a high transmittance of 99.09% can be obtained. The water contact angle and the oil contact angle of the coating are 113.8o and 74.4o, which can effectively prevent the absorption of water and polar organic molecules from the environment.

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