scholarly journals Superhydrophilic Smart Coating for Self-Cleaning Application on Glass Substrate

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
A. Syafiq ◽  
B. Vengadaesvaran ◽  
A. K. Pandey ◽  
Nasrudin Abd. Rahim
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Glass Substrate ◽  
Glass Surface ◽  
Free Water ◽  
Outdoor Environment ◽  
Polypropylene Glycol ◽  
Water Contact ◽  
Bare Glass ◽  
Self Cleaning

In general, superhydrophilic coating on glass substrate possesses water contact angle (WCA) below 10° and contains high self-cleaning properties in outdoor environment as compared to noncoated glass substrate panels. In this study, the superhydrophilic coating behavior on glass substrate has been developed. The micro- and nanosized titanium dioxide (TiO2) particles have been utilized to improve the surface roughness, and the polypropylene glycol (PPG) has been utilized to increase the surface energy of glass substrates. The wettability of coating surface shows the coating possess water contact angle (WCA) as low as 5° and suddenly reduce to 0° after 10 s. Superhydrophilic coated glass clearly shows excellent dirt repellent against dilute ketchup solution due to the absence of dirt streak on the glass surface. Meanwhile, the dirt streak is present on the bare glass surface indicating its weak self-cleaning property. The developed superhydrophilic coating on glass substrate was also found to have great antifog property compared to the bare glass substrate. Superhydrophilic surfaces have showed free tiny droplet even at 130°C of hot boiling bath for 10 min and completely dry after 1 min. The superhydrophilic coating surfaces have demonstrated free water streak after impacting with harsh water spraying for 5 min confirming that the superhydrophilic coating on glass substrate is antiwater streak.

Improved Hydrophobicity of Silicon Dioxide Integrated Zinc-Tellurite Glass Surface

2017 ◽  
Vol 268 ◽  
pp. 87-91
Author(s):  
Syarinie Azmi ◽  
Ramli Arifin ◽  
Sib Krishna Ghoshal
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Glass Surface ◽  
Tellurite Glass ◽  
Hydrophobic Surfaces ◽  
Water Contact ◽  
Host Matrix ◽  
The Impact

Economically viable and maintenance free glass surfaces with improved hydrophobicity are highly demanding in the recent nanotechnology era. Deposition of pollutants and dirt on glass surface that not only causes visual obscurity but also damages the cultural heritages are still to be researched intensely. It is documented that excellent hydrophobic surfaces (with contact angle greater than 90o) can be achieved by controlling the surface wettability, where liquid droplets remain spherical on such surfaces. Selection of materials and the preparation method play a significant role towards such accomplishments. Stirred by this idea, we explored the feasibility of fabricating super-hydrophobic tellurite glass systems by facilely varying the compositions of different constituents. Highly transparent and thermally stable ternary tellurite glass system with chemical composition of (80-x)TeO2 – xSiO2 – 20ZnO, where x = 0.00 to 0.20 mol% are synthesized via conventional melt-quenching method. Samples are characterized using Atomic Force Microscopy (AFM) and contact angle measurements. The impact of SiO2 concentrations variation on the surface roughness, surface energy, and hydrophobic properties are inspected. Glass surface roughness as much as 9.885 nm is attained. The optimal value of water contact angle is discerned to be 101.02° for 0.1 mol% of SiO2 incorporation into the amorphous tellurite host matrix. Besides, the surface energy revealed an inverse proportionality to the water contact angle. This achieved contact angle (greater than 90°) makes this hydrophobic glass surface beneficial for diverse applications. It is established that the present glass composition may be prospective for the development of super-hydrophobic surfaces.

Alternating copolymerization of ω-perfluoroalkyl-1-alkenes with carbon monoxide catalyzed by homogeneous and polymer-supported Pd-complexes

2001 ◽  
Vol 79 (5-6) ◽  
pp. 593-597
Author(s):  
Kyoko Nozaki ◽  
Fumitoshi Shibahara ◽  
Stephan Elzner ◽  
Tamejiro Hiyama
Keyword(s):  
Contact Angle ◽  
Carbon Monoxide ◽  
Water Contact Angle ◽  
Glass Surface ◽  
Water Contact ◽  
Solution State ◽  
Polymer Supported ◽  
Pd Complexes ◽  
Alternating Copolymerization ◽  
Supported Pd

Alternating copolymerization of fluorinated olefins (CnF2n+ 1)(CH2)mCH=CH2 (1) and carbon monoxide was carried out using cationic Pd(II)-(R,S)-BINAPHOS complexes (2) as catalysts. To obtain polymeric products sufficiently, existence of at least two methylenes in 1 were essential (m [Formula: see text] 2). The products thus obtained formed polyspiroketal (4) rather than polyketone (3), the structures being determined by solid- and solution-state NMR and IR analyses. The water contact angle was 108° for a sample of 4f when it was casted on a glass surface from C6F6 solution.Key words: copolymer, fluoroalkene, carbon monoxide, palladium, contact angle.

scholarly journals High Stability Performance of Superhydrophobic Modified Fluorinated Graphene Films on Copper Alloy Substrates

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Rafik Abbas ◽  
N. Elkhoshkhany ◽  
Ahmed Hefnawy ◽  
Shaker Ebrahim ◽  
Aya Rahal
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sliding Angle ◽  
Water Contact ◽  
Stability Performance ◽  
Graphene Films ◽  
Superhydrophobic Property ◽  
Self Cleaning ◽  
Fluorinated Graphene ◽  
Highly Hydrophobic

A stable self-cleaning superhydrophobic modified fluorinated graphene surface with micro/nanostructure was successfully fabricated on copper substrates via drop coating process. Irregularly stacked island-like multilayered fluorinated graphene nanoflakes comprised the microstructure. The fabricated films exhibited outstanding superhydrophobic property with a water contact angle 167° and water sliding angle lower than 4°. The developed superhydrophobic surface showed excellent corrosion resistance with insignificant decrease of water contact angle 166° in 3.5 wt.% NaCl solution. This stable highly hydrophobic performance of the fluorinated graphene films could be useful in self-cleaning, antifogging, corrosion resistive coatings and microfluidic devices.

Preparation and Characterization of Superhydrophobic Polypropylene Surface with Excellent Self-Cleaning Property

2011 ◽  
Vol 295-297 ◽  
pp. 1613-1616 ◽  
Author(s):  
Zhi Qing Yuan ◽  
Jun Liang Wu ◽  
Xi Hai Hao ◽  
Xu Nan Wang ◽  
Xun Meng Xu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sliding Angle ◽  
Water Contact ◽  
Artificial Rain ◽  
Self Cleaning

A superhydrophobic polypropylene surface was obtained by a facile method. The water contact angle and sliding angle of the superhydrophobic polypropylene surface were 157±1.8ºand 1.6º, respectively. When the superhydrophobic polypropylene surface was contaminated, 99 % contaminant particles were removed from the superhydrophobic polypropylene surface by artificial rain, showing excellent self-cleaning property.

scholarly journals A green approach of superhydrophobic surface fabrication on recycled high-density polyethylene using sodium chloride

2021 ◽  
Vol 2080 (1) ◽  
pp. 012004
Author(s):  
Muhammad Aidil Adz’ryl Nor Azizan ◽  
Muhammad Salihin Zakaria ◽  
Razif Muhammed Nordin ◽  
Khairul Anwar Abdul Halim ◽  
Bee Ying Lim ◽  
...  
Keyword(s):  
Contact Angle ◽  
Sodium Chloride ◽  
Surface Morphology ◽  
Water Contact Angle ◽  
High Density Polyethylene ◽  
Superhydrophobic Surface ◽  
High Density ◽  
Water Contact ◽  
Green Approach ◽  
Self Cleaning

Abstract In this work, the water-dissolved surface modifier method was introduced to recycled high-density polyethylene (rHDPE) matrix to fabricate green superhydrophobic surfaces. Surface cavities on rHDPE are formed by sodium chloride particles which can be readily rinsed off and reused. Water contact angle, self-cleaning properties, and surface morphology were characterized. By creating porosity onto the rHDPE matrix, the surface exhibits an excellent self-cleaning property with a water contact angle larger than 150°. Surface morphology reveals the porosity and roughness of the surface. In this fabricating process, no chemicals are used while rHDPE is selected for the purpose. Based on the findings, it is proven that the superhydrophobic surface can be fabricated with a simple yet green approach.

scholarly journals Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1050
Author(s):  
Natangue Heita Shafudah ◽  
Hiroki Nagai ◽  
Yutaka Suwazono ◽  
Ryuhei Ozawa ◽  
Yukihiro Kudoh ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Quartz Glass ◽  
Glass Substrate ◽  
Quartz Glass Substrate ◽  
Electrospray Deposition ◽  
Water Contact ◽  
X Ray

Titania precursor films were electrosprayed on a quartz glass substrate, which was pre-modified with an ultra-thin film obtained by spin-coating a single-walled carbon nanotube (SWCNT) dispersed solution. The X-ray diffraction patterns of the thin films obtained by heat-treating the precursor films at 500 °C in air for 1 h indicated that the formed crystals were anatase. A new route to fabricate transparent thin films on the insulating substrate via electrospray deposition (ESD) was thus attained. The photoluminescence spectrum of the thin film showed a peak at 2.23 eV, assignable to the self-trapped exciton of anatase. The Raman spectrum of the thin film demonstrated that heat treatment is useful for removing SWCNTs. The thin film showed a water contact angle of 14 ± 2° even after being kept under dark conditions for 1 h, indicating a high level of hydrophilicity. Additionally, the thin film had a super-hydrophilic surface with a water contact angle of 1 ± 1° after ultraviolet light irradiation with an intensity of 4.5 mW cm−2 at 365 nm for 1 h. The importance of Ti3+ ions in the co-present amorphous phase, which was dominantly formed via the ESD process, for hydrophilicity was also clarified by means of X-ray photoelectron spectroscopy.

scholarly journals Testing the Durability of Anti-Soiling Coatings for Solar Cover Glass by Outdoor Exposure in Denmark

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 299 ◽  
Author(s):  
Gizelle C. Oehler ◽  
Fabiana Lisco ◽  
Farwah Bukhari ◽  
Soňa Uličná ◽  
Ben Strauss ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Light Transmission ◽  
High Water ◽  
Outdoor Exposure ◽  
Outdoor Environment ◽  
Cover Glass ◽  
Water Contact ◽  
Hydrophobic Coating ◽  
And Performance

The presence of soiling on photovoltaic modules reduces light transmission through the front cover glass to the active absorber, thereby reducing efficiency and performance. Current soiling mitigation techniques are expensive and/or ineffective. However, anti-soiling coatings applied to the solar cover glass have the potential to reduce soiling for long periods of time without continuous maintenance. This paper reports the performance of two transparent hydrophobic coatings (A and B) exposed to the outdoor environment of coastal Denmark for 24 weeks. A comparison was made between the performance of coated and uncoated glass coupons, periodically cleaned coupons, and accelerated laboratory tests. Although initial results were promising, water contact angle and transmittance values were found to decline continuously for all coated and uncoated coupons. Surface blisters, film thickness reduction, changes in surface chemistry (fluorine loss), and abrasion damage following cleaning were observed. Coupons cleaned every 4 weeks showed a restoration in transmittance. Cycles of light rainfall and evaporation combined with a humid and salty environment led to cementation occurring on all coupons. The development of an abrasion-resistant, super-hydrophobic coating with a low roll-off angle and high water contact angle is more likely to provide an anti-soiling solution by reducing the build-up of cementation.

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