Room Temperature Processed Hard Easy Clean Coating Using Ammonia Treatment

2010 ◽  
Vol 447-448 ◽  
pp. 740-744 ◽  
Author(s):  
Xiao Zhang ◽  
Min Qian ◽  
Yu Chan Liu ◽  
Hong Xie
Keyword(s):  
Room Temperature ◽  
Water Drop ◽  
Sol Gel ◽  
High Hardness ◽  
Hard Coatings ◽  
Sliding Angle ◽  
Water Contact ◽  
Pencil Hardness ◽  
Glass Substrates ◽  
Plastic Surface

In this paper we report the fabrication of hydrophobic hard coatings using sol-gel processing and cured at room temperature by an ammonia-assisted process. The coating thickness can be tuned from several hundreds of nanometer to several microns. These coatings show both high transparency (better than PMMA or glass substrates) and high hardness (pencil hardness 2H-4H on PMMA). The coatings are very smooth with surface roughness Ra less than 2 nm for coatings with different thicknesses from 200 nm to 2 m. The water contact angle (WCA) of the coating is about 115 to 120o and the sliding angle for a 20 l water drop is less than 10o. The advantage of this process is the ease for larger area application and especially suitable for plastic surface treatment due to the low temperature curing process.

scholarly journals Optical and Physical Properties of Methyltrimethoxysilane Transparent Film Incorporated with Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
W. Ahliah Ismail ◽  
Zainal Abidin Ali ◽  
R. Puteh
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Coating System ◽  
Transparent Film ◽  
Glass Substrates ◽  
Scratch Hardness ◽  
Coated Film ◽  
Light Diffusion ◽  
Nanoparticles Of Silver ◽  
Trimethoxy Silane

Methyltrimethoxysilane has been used as a base in the formation of transparent sol-gel coatings on glass substrates. Several types of alcohol were used as solvents in order to obtain the highest transparency and scratch hardness of the film. The coating cures at room temperature (26∘C). The clarity of the coated film on the glass substrate was measured using haze meter. The best formulation based on the lowest haze values and light diffusion is the ratio of 1 : 1 trimethoxy silane to N-propanol. The haze value obtained for this system is 0.86, and the light diffusion was measured at 0.77%. Tack-free time and hardness were within acceptable value. Nanoparticles of silver, zinc oxide, and titanium dioxide were incorporated into the coating system from 0.5% to 2.5% by weight, and the haze values of the dried film were measured. The highest transparency was obtained from the samples that were mixed with 0.5% silver. The haze value for this sample is of 0.5.

scholarly journals Fabrication of superhydrophobic composite coating based on fluorosilicone resin and silica nanoparticles

2018 ◽  
Vol 5 (7) ◽  
pp. 180598 ◽  
Author(s):  
Xiaoming Wang ◽  
Xingeng Li ◽  
Qingquan Lei ◽  
Yaping Wu ◽  
Wenjing Li
Keyword(s):  
Silica Nanoparticles ◽  
Composite Coating ◽  
Room Temperature ◽  
Silica Content ◽  
Superhydrophobic Coating ◽  
Polymer Model ◽  
Modified Silica ◽  
Sliding Angle ◽  
Water Contact ◽  
Modified Silica Nanoparticles

Composite superhydrophobic coating built with film former and filler is attracting much attention for its facile and convenient fabrication, but significant limitations and disadvantages still remain. In this paper, a composite superhydrophobic coating is introduced which can be cured at room temperature and made by dispersing modified silica nanoparticles with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane in fluorosilicone resin. Silica content and dispersion time showed obvious influences on the morphology and topography of composite coating by reuniting dispersed nanoparticles to form peaks on the surface. Excessively large distances between these peaks would decrease water contact angle value. Increasing slope of peaks, appropriate distance between peaks and decreasing diameter size of peaks would diminish sliding angle value. Formation mechanism of the composite coating based on fluorosilicone resin and modified nanoparticles was explained using interpenetrating polymer model.

Effect of pH Value on Structural and Optical Properties of Transparent Nano-Crystalline TiO2 Films Prepared by Sol-Gel Dip-Drive Coating

2013 ◽  
Vol 678 ◽  
pp. 80-85 ◽  
Author(s):  
Krishnasamy Sakthivel ◽  
T. Venkatachalam
Keyword(s):  
Ab Initio ◽  
Room Temperature ◽  
Ph Value ◽  
Sol Gel ◽  
Structural And Optical Properties ◽  
Glass Substrates ◽  
Ph Values ◽  
Nano Crystalline ◽  
Crystalline Nature ◽  
Deposited Films

Thin films of TiO2 have been deposited on well cleaned glass substrates by Sol-Gel dip-drive coating technique. The films have been prepared at three different pH values (1, 3.5 & 9) of Sol and annealed in muffle furnace at 550°C for one hour and are allowed to cool to room temperature. The films were characterized by XRD, EDAX, SEM and UV-Vis Spectrophotometer. The as deposited films were found to be amorphous in nature. The annealed films exhibit anatase in crystalline structure. The EDAX results have shown that all the films are maintained with TiO2 in composition. The XRD results reveal that they are nano-crystalline in nature and the crystalline nature increases with pH of the Sol. The transmittance and absorbance spectra have shown that the films are transparent and band gap of the films are of the order of 3.2eV. The ab initio studies of TiO2 (using GGA) was performed with Vienna ab initio Simulation package and the band structure and effective masses of the electrons and holes were determined.

Nanoindentation and adhesion of sol-gel-derived hard coatings on polyester

2000 ◽  
Vol 15 (1) ◽  
pp. 148-154 ◽  
Author(s):  
C. M. Chan ◽  
G. Z. Cao ◽  
H. Fong ◽  
M. Sarikaya ◽  
T. Robinson ◽  
...  
Keyword(s):  
Low Temperature ◽  
Transition Metal Oxides ◽  
Sol Gel ◽  
Surface Hardness ◽  
Hard Coatings ◽  
Silica Network ◽  
Plastic Surface ◽  
Order Of Magnitude ◽  
Oxygen Plasma Etching ◽  
Optical And Mechanical Properties

We investigated sol-gel-derived silica-based hard coatings on modified polyester substrates. The silica network was modified by incorporating an organic component and adding transition metal oxides. These modifications resulted in tailored thermal, optical, and mechanical properties of the coatings. Various low-temperature densification techniques were studied including sol-preparation procedure, enhanced solvent evaporation, ultraviolet irradiation, and low-temperature heating (below 150 °C). Oxygen plasma etching was applied to improve the adhesion of the sol-gel coatings on the plastic surface. Nanoindentation analysis revealed that the coatings have a surface hardness up to 2.5 ± 0.27 GPa and an elastic modulus up to 13.6 ± 0.4 GPa, approximately an order of magnitude higher than that of the plastic surface.

scholarly journals Characteristics and optical properties of Fe3+ doped SiO2/TiO2 thin films prepared by the sol-gel dip-coating method

2013 ◽  
Vol 16 (1) ◽  
pp. 92-100
Author(s):  
Chien Mau Dang ◽  
Dam Duy Le ◽  
Tam Thi Thanh Nguyen ◽  
Dung Thi My Dang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Water Contact ◽  
Glass Substrates ◽  
Coating Method ◽  
Dip Coating Method

In this study, we have successfully synthesized Fe3+ doped SiO2/TiO2 thin films on glass substrates using the sol-gel dip-coating method. After synthesizing, the samples were annealed at 5000C in the air for 1 hour. The characteristics and optical properties of Fe3+ doped SiO2/TiO2 films were then investigated by X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis) and Fourier transform infrared spectroscopy (FT-IR). An antifogging ability of the glass substrates coated with the fabricated film is investigated and explained by a water contact angle under visible-light. The analyzed results also show that the crystalline phase of TiO2 thin films comprised only the anatase TiO2, but the crystalline size decreased from 8.8 to 5.9 nm. We also observed that the absorption edge of Fe3+- doped SiO2/TiO2 thin films shifted towards longer wavelengths (i.e. red shifted) from 371.7nm to 409.2 nm when the Fe3+-doped concentration increased from 0 to 1 % mol.

Organic-inorganic composite nanocoatings with superhydrophobicity and thermal stability

2018 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
A. Syafiq ◽  
A.K. Pandey ◽  
Vengadaesvaran Balakrishnan ◽  
Syed Shahabuddin ◽  
Nasrudin Abd Rahim
Keyword(s):  
Thermal Stability ◽  
Surface Roughness ◽  
Glass Substrate ◽  
Alkyl Chain ◽  
Sol Gel ◽  
High Thermal Stability ◽  
Sliding Angle ◽  
Water Contact ◽  
Content Type ◽  
Superhydrophobic Coatings

Purpose This paper aims to investigate the thermal stability and hydrophobicity of difference alkyl chain of silanes with silicon (Si) micro- and nanoparticles. Design/methodology/approach Sol-gel methods have been used to design superhydrophobic glass substrates through surface modification by using low-surface-energy Isooctyl trimethoxysilane (ITMS) and Ethyl trimethoxysilane (ETMS) solution. Hierarchical double-rough scale solid surface was built by Si micro- and nanoparticles to enhance the surface roughness. The prepared sol was applied onto glass substrate using dip-coating method and was dried at control temperature of 400°C inside the tube furnace. Findings The glass substrate achieved the water contact angle as high as 154 ± 2° and 150.4 ± 2° for Si/ITMS and Si/ETMS films, respectively. The Si/ITMS and Si/ETMS also were equipped with low sliding angle as low as 3° and 5°, respectively. The Si micro- and nanoparticles in the coating system have created nanopillars between them, which will suspend the water droplets. Both superhydrophobic coatings have showed good stability against high temperature up to 200°C as there are no changes in WCA shown by both coatings. Si/ITMS film sustains its superhydrophobicity after impacting with further temperature up to 400°C and turns hydrophobic state at 450°C. Research limitations/implications Findings will be useful to develop superhydrophobic coatings with high thermal stability. Practical implications Sol method provides a suitable medium for the combination of organic-inorganic network to achieve high hydrophobicity with optimum surface roughness. Originality/value Application of different alkyl chain groups of silane resin blending with micro- and nanoparticles of Si pigments develops superhydrophobic coatings with high thermal stability.

scholarly journals Functional Superhydrophobic Coating Systems for Possible Corrosion Mitigation

2020 ◽  
Vol 14 (2) ◽  
pp. 148-158 ◽  
Author(s):  
Sarah F. Jurak ◽  
◽  
Emil F. Jurak ◽  
Md. Nizam Uddin ◽  
Ramazan Asmatulu
Keyword(s):  
Sol Gel ◽  
Chemical Vapor ◽  
Layer By Layer ◽  
Superhydrophobic Coating ◽  
Sliding Angle ◽  
One Pot ◽  
Water Contact ◽  
Superhydrophobic Coatings ◽  
Run Off ◽  
Self Cleaning

Because of their repellent, corrosion-mitigating, anti-icing, and self-cleaning properties, superhydrophobic coatings have numerous applications from windshields to textiles. A superhydrophobic coating is defined as one having a water contact angle (WCA) greater than 150° with a surface sliding angle less than 10°, and very low hysteresis between the advancing and receding angles. Its surface exhibits the so-called “lotus leaf effect,” whereby water bounces and balls up on contact. Here, water droplets run off readily, taking along dirt and dust for a self-cleaning effect that keeps the surface dry. The chemical composition of a surface affects the WCA, which can rise to 120°, but to achieve a WCA greater than 150°, which is considered superhydrophobic, an additional micro- and nanostructural component is needed. This functional hierarchical micro- and nanomorphology is exhibited in nature by plants and insects. A superhydrophobic coating on metallic substrates promises to provide corrosion mitigation by blocking oxygen and electrolytes, which are needed for the initiation of corrosion at the surface and interface. The methods used for preparing functional superhydrophobic coatings include sol-gel processing, layer-by-layer assembly, etching, lithography, chemical and electrochemical depositions, chemical vapor deposition, electrospinning, hydrothermal synthesis, and one-pot reactions. In this work, some research studies conducted to develop robust and durable superhydrophobic coatings are discussed in detail and analyzed for possible corrosion mitigation on the surfaces of metals and alloys. Scientists, engineers, students, and other participants in automotive, aircraft, energy, defense, electronics, and other industries will benefit greatly from this work.

Titanium and zirconium hard coatings on glass substrates prepared by the sol–gel method

2009 ◽  
Vol 517 (20) ◽  
pp. 5881-5887 ◽  
Author(s):  
Paolo Zurlini ◽  
Andrea Lorenzi ◽  
Ilaria Alfieri ◽  
Guglielmina Gnappi ◽  
Angelo Montenero ◽  
...  
Keyword(s):  
Sol Gel ◽  
Hard Coatings ◽  
Gel Method ◽  
Sol Gel Method ◽  
Glass Substrates

Preparation and characterization of SiO2/fluoroalkyl-trialkoxysilane/2-hydroxyethyl methacrylate/trimethylolpropane triacrylate and SiO2/3-(trimethoxysilyl)propyl methacrylate/ 2-hydroxyethyl methacrylate/trimethylolpropane triacrylate coatings on glass substrates using the sol-gel method

2016 ◽  
Vol 36 (3) ◽  
pp. 309-320 ◽  
Author(s):  
Wei-Ming Chiu ◽  
Jhih-Siao Syu ◽  
Peir-An Tsai ◽  
Jyh-Horng Wu
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dip Coating ◽  
Hydroxyethyl Methacrylate ◽  
Pencil Hardness ◽  
Propyl Methacrylate ◽  
Glass Substrates ◽  
Trimethylolpropane Triacrylate ◽  
Sol Gel Process

Abstract Organic/inorganic hybrid materials were formed using the sol-gel process, in which SiO2/fluoroalkyl-trialkoxysilane (FAS)/2-hydroxyethyl methacrylate (2-HEMA)/trimethylolpropane triacrylate (TMPTA) and SiO2/3-(trimethoxysilyl)propyl methacrylate (MSMA)/ 2-HEMA/TMPTA thin films were formed on a glass substrate using dip coating. Experimental results revealed that FAS and MSMA improved the pencil hardness of SiO2/2-HEMA/TMPTA thin films without affecting their optical properties. FAS strengthened the hydrophobic and hydrophilic characteristics of SiO2/2-HEMA/TMPTA thin films more than did MSMA. However, an excess of FAS and an increase in withdrawal rates deteriorates the gloss, because both increased the SiO2 content, reducing the reflectivity.

scholarly journals Photoirradiation Caused Controllable Wettability Switching of Sputtered Highly Alignedc-Axis-Oriented Zinc Oxide Columnar Films

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
P. W. Chi ◽  
C. W. Su ◽  
B. H. Jhuo ◽  
D. H. Wei
Keyword(s):  
Zinc Oxide ◽  
Room Temperature ◽  
Rf Magnetron Sputtering ◽  
Surface Charges ◽  
Water Contact ◽  
Glass Substrates ◽  
Hydrophobic Behavior ◽  
Microstructure Morphology ◽  
Hybrid Sensors ◽  
Good Transparency

This study presents the microstructure morphology and UV photoirradiation coupling effects of the c-axis-oriented zinc oxide (ZnO) columnar films. Highly aligned c-axis-oriented films have been deposited onto glass substrates at room temperature by radio-frequency (RF) magnetron sputtering without introducing any oxygen source under different sputtering powers ranging from 50 to 150 W. Self-assembled ZnO columnar structures that were successfully obtained belong to wurtzite structure, and the corresponding columnar structures and crystalline orientation were confirmed by the FE-SEM and XRD, respectively. All the ZnO columnar films exhibit good transparency with a visible light averaged transmittance over 82%. According to water contact angle (CA) measurement, ZnO columnar films exhibit hydrophobic behavior. After exposing to photoirradiation under ultraviolet (UV) environment, all the ZnO samples showed remarkable transition from hydrophobic to superhydrophilic surfaces and could return to their original hydrophobicity after being placed in the dark. It is demonstrated that the controllable wettability of ZnO columnar films under changing between the UV photoirradiation and dark storage is due to the surface charges accumulation and discharging processes. As a result, this study could provide important applications for many fields such as ZnO-based hybrid sensors/solar cells functional devices with photoirradiation disinfection surfaces accompanied with reversible wettability switches.

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