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

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 627 ◽  
Author(s):  
Karmele Vidal ◽  
Estíbaliz Gómez ◽  
Amaia Martínez Goitandia ◽  
Adrián Angulo-Ibáñez ◽  
Estíbaliz Aranzabe
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sol Gel ◽  
Hydrophobic Surface ◽  
Silica Coating ◽  
Water Contact ◽  
Silica Coatings ◽  
Sol Gel Process ◽  
Average Water ◽  
Infrared Spectrometer

A super-hydrophobic surface at a high temperature (400 °C) using the sol-gel method with tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) as precursors has been obtained. The effects of the coatings’ ages, deposited times and thicknesses on the hydrophobicity of the silica coatings have been analysed. The morphology, chemical composition, thermal degradation and hydrophobicity of the resulting surfaces have been studied by scanning electron microscopy (SEM), Fourier transfer infrared spectrometer (FT-IR), Thermogravimetry (TGA) and water contact angle (WCA) measurement. The results show that an average water contact angle of 149° after been cured at 400 °C for a coating aged for 5 days, and four deposition cycles using a dipping rate of 1000 mm/min was achieved.

Osteoconductivity of Superhydrophilic Ti- and Zr-Alloy for Biomedical Application

2016 ◽  
Vol 879 ◽  
pp. 2524-2527
Author(s):  
Masazumi Okido ◽  
Kensuke Kuroda
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Strong Influence ◽  
Biomedical Application ◽  
Hydrophobic Surface ◽  
Hydrophilic Surface ◽  
Water Contact ◽  
Zr Alloy ◽  
Zr Alloys

Surface hydrophilicity is considered to have a strong influence on the biological reactions of bone-substituting materials. However, the influence of a hydrophilic or hydrophobic surface on the osteoconductivity is not completely clear. In this study, we produced super-hydrophilic and hydrophobic surface on Ti-and Zr-alloys. Hydrothermal treatment at 180 oC for 180 min. in the distilled water and immersion in x5 PBS(-) brought the super-hydrophilic surface (water contact angle < 10 (deg.)) and heat treatment of as-hydrothermaled the hydrophobic surface. The osteoconductivity of the surface treated samples with several water contact angle was evaluated by in vivo testing. The surface properties, especially water contact angle, strongly affected the osteoconductivity and protein adsorbability, and not the surface substance.

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...

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.

An Effective Route to the Fabrication of Super-Hydrophobic Surfaces Combined by Micromolding and Photograft Polymerization Methods

2012 ◽  
Vol 152-154 ◽  
pp. 9-13
Author(s):  
Jing Tao Yang ◽  
Lei Wang ◽  
Zheng Yuan Huo ◽  
Jie Feng ◽  
Feng Chen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Energy Dispersive Spectrometer ◽  
Hydrophobic Surface ◽  
Body Structure ◽  
Critical Difference ◽  
Water Contact ◽  
Methacrylate Monomers ◽  
Polypropylene Matrix ◽  
Morphology Characterization

A super-hydrophobic surface on the polypropylene matrix was fabricated via micromolding and photograft polymerization. A micro-convex body structure was molded by etching templates. The water contact angle could be increased to 138°. The fluoro methacrylate monomers were further grafted to the surface through UV-induced photograft polymerization. The morphology characterization and the spectroanalysis indicated that the rough hierarchical structure (confirmed by scanning electron microscope) and the grafted fluoropolymers (measured by fourier transform infrared spectrum and X-ray energy dispersive spectrometer) made a critical difference. A water contact angle of 160° was arrived.

Hydrophobic Performance of Core/Shell Nanoarrays Modified by Stearic Acid

2020 ◽  
Vol 15 (2) ◽  
pp. 264-268
Author(s):  
Hongxing Han ◽  
Lin Pan ◽  
Manying Zhang ◽  
Lei Zhao ◽  
Zhifeng Liu
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Water Contact Angle ◽  
Zno Nanorods ◽  
Hydrophobic Surface ◽  
Optical Transmittance ◽  
Surface Hydrophobicity ◽  
Core Shell ◽  
Water Contact ◽  
Angle Measurements

In this paper, we successfully prepare hydrophobic surface of ZnO/ZnS nanorods arrays modified by stearic acid. The morphology, microstructure, optical transmittance and self-cleaning property are examined by SEM, XRD, UV-vis and water contact angle measurements, respectively. The ZnO/ZnS core/shell nanoarrays shows a higher value of water contact angle in compare with that of pure ZnO nanorods arrays. After treatment by stearic acid, the resulting ZnO/ZnS nanostructure exhibits the best hydrophobicity with water droplets about 146.5 . The results show that the surface hydrophobicity of ZnO/ZnS nanoarrays can be improved by using stearic acid with low-surface-energy.

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.

Effects of Titanium Surface Wettability on Osteoblast Behavior In Vitro

2020 ◽  
Vol 985 ◽  
pp. 64-68
Author(s):  
Kenta Nisogi ◽  
Satoshi Okano ◽  
Sengo Kobayashi ◽  
Kensuke Kuroda ◽  
Takeaki Okamoto
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Titanium Surface ◽  
Pure Titanium ◽  
Hydrophobic Surface ◽  
Surface Wettability ◽  
In Vitro Assays ◽  
Water Contact ◽  
Heat Treated

Surface wettability is thought to influence the osteoconductivity of bone-substituting materials; however, the effects of surface wettability on osteoblast behavior are not well understood. In this study, we prepared both an as-polished pure titanium with a water contact angle (WCA) of 57° and heat-treated pure titanium with more hydrophobic surface and WCAs of 68°-98°. The effects of the surface wettability of pure titanium on osteoblast behaviors were evaluated by in vitro assays. Compared with the as-polished titanium, the proliferation rate of osteoblast increased on heat-treated titanium. This suggested that surface wettability affects osteoblast behaviors, meaning osteoconductivity is influenced by surface wettability.

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.

Contact Angle Analysis on Glass Based Surface

2014 ◽  
Vol 680 ◽  
pp. 93-96
Author(s):  
Muhammad Hafiz Ab Aziz ◽  
Zaliman Sauli ◽  
Vithyacharan Retnasamy ◽  
Wan Mokhdzani Wan Norhaimi ◽  
Steven Taniselass ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Hydrophobic Surface ◽  
Soda Lime ◽  
Sample Surface ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Anodic Bonding ◽  
Soda Lime Glass ◽  
Water Contact

This paper reports on the contact angle measurement analysis on a glass based surface for anodic bonding process cleaned by three distinct cleaning processes. The three types of glass based surface used were silica, pyrex, and soda lime glass. The three cleaning solutions tested in this experiment were RCA, piranha and acetone. Water Droplet Test (WDT) was done to analyze the contact angle of micro droplet on sample surface. It can be done by dropping a droplet of water in constant volume at the fixed height and angle. Only RCA process constantly decreases the contact angle value after cleaning. The compilations of data strongly proved that all samples become hydrophilic after RCA cleaning process. The solid surface is considered hydrophilic when water contact angle is smaller than 90°, and hydrophobic profile if the water contact angle is larger than 90°. Samples which undergo piranha and acetone cleaning did not prove any characteristic of hydrophilic or hydrophobic surface after cleaning.

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°.

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