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.

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...

Preparation and Properties Fluoralkylpolysiloxane Modified Polyurethane Films

2009 ◽  
Vol 620-622 ◽  
pp. 741-744 ◽  
Author(s):  
Rui Weng ◽  
Chong Rui Wang ◽  
Lian Meng Zhang ◽  
Shui Ping Wang
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Silicone Oil ◽  
Soft Segment ◽  
High Water ◽  
Water Contact ◽  
Sulfuryl Fluoride ◽  
Low Surface Energy ◽  
End Capping ◽  
Amino Silicone

Fluoralkylpolysiloxane modified Polyurethane (FSPU) films with high water contact angle (CA) were prepared. fluoralkylpolysiloxane was obtained using perfluoro octyl sulfuryl fluoride and terminal amino-silicone oil as reactants. Then, the isocyanate end capped PU prepolymer was synthesized by reacting isocyanate with a soft segment mixed by active amino-end-capping fluoralkylpolysiloxane and polyether glycol. The fluoralkylpolysiloxane modified PU films were obtained after the PU prepolymer was cured by 3,3 '- dichloro -4,4' – amino - diphenyl methane (MOCA). The results showed that the modified polyurethane with 10% (mass fraction) PFATPS had a good compatibility, low surface energy, surface water contact angle and surface oil contact angle was improved by 49° and 37° respectively, and heat resistance, water resistance was apparently improved.

scholarly journals Bifunction-Integrated Dielectric Nanolayers of Fluoropolymers with Electrowetting Effects

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2474 ◽  
Author(s):  
Hao Wu ◽  
Hao Li ◽  
Ahmad Umar ◽  
Yao Wang ◽  
Guofu Zhou
Keyword(s):  
Contact Angle ◽  
Dielectric Properties ◽  
Water Contact Angle ◽  
Essential Role ◽  
Bottom Layer ◽  
Dielectric Strength ◽  
High Water ◽  
Water Contact ◽  
Teflon Af ◽  
First Time

Fluoropolymers play an essential role in electrowetting (EW) systems. However, no fluoropolymer possesses the desirable properties of both hydrophobicity and dielectric strength. In this study, for the first time, we report the integration of two representative fluoropolymers—namely, Teflon AF (AF 1600X) and Cytop (Cytop 809A)—into one bifunctionalized dielectric nanolayer. Within this nanolayer, both the superior hydrophobicity of Teflon AF and the excellent dielectric strength of Cytop were able to be retained. Each composed of a 0.5 μm Cytop bottom layer and a 0.06 μm Teflon AF top layer, the fabricated composite nanolayers showed a high withstand voltage of ~70 V (a dielectric strength of 125 V/μm) and a high water contact angle of ~120°. The electrowetting and dielectric properties of various film thicknesses were also systemically investigated. Through detailed study, it was observed that the thicker Teflon AF top layers produced no obvious enhancement of the Cytop/Teflon AF stack.

Superhydrophobic Nanocrystalline Nickel Films Inspired by Lotus Leaf

2008 ◽  
Vol 1132 ◽  
Author(s):  
Mehdi Shafiei ◽  
Ahmet T. Alpas
Keyword(s):  
Contact Angle ◽  
Grain Size ◽  
Surface Structure ◽  
Water Contact Angle ◽  
Surface Texture ◽  
High Water ◽  
New Method ◽  
Water Contact ◽  
Lotus Leaf ◽  
Tip Radius

ABSTRACTA new method to fabricate superhydrophobic hard films is described. Surface texture of lotus leaf was replicated on an acetate film, on which a nanocrystalline (NC) Ni coating with a grain size of 30 ± 4 nm and a hardness of 4.42 GPa was electrodeposited. The surface texture consisted of conical protuberances with a height of 10.0 ± 2.0 0m and a tip radius of 2.5 ± 0.5 0m. An additional electrodeposition for 120 s and 300 s was used to locally modify the surface structure by depositing ‘Ni crowns' on the protuberances that increased their height to 14.0 ± 2.0 0m and their tip radius to 6.0 ± 0.5 0m. The modified structures were then treated with a perfluoropolyether (PFPE) solution, which provided a high water contact angle of 156°, i.e., comparable to the naturally superhydrophobic lotus leaf. The increased hydrophobicity as a result of surface structure and chemistry modifications was evident compared to a smooth NC Ni sample, which had a contact angle of 64°.

A Facile All-Solution-Processed Surface with High Water Contact Angle and High Water Adhesive Force

2017 ◽  
Vol 9 (27) ◽  
pp. 23246-23254 ◽  
Author(s):  
Mei Chen ◽  
Wei Hu ◽  
Xiao Liang ◽  
Cheng Zou ◽  
Fasheng Li ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
High Water ◽  
Adhesive Force ◽  
Water Contact ◽  
Solution Processed

Selective growth of fullerene octahedra and flower-like particles by a liquid–liquid interfacial precipitation method for super-hydrophobic applications

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78791-78794 ◽  
Author(s):  
Thamodaran Partheeban ◽  
Marappan Sathish
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
High Water ◽  
Selective Growth ◽  
Precipitation Method ◽  
Water Contact

Super-hydrophobic fullerene octahedron and flower-like microcrystals with a high water contact angle of 158.8° were prepared using anisole and IPA in a liquid–liquid interfacial precipitation method.

A superrobust superhydrophobic PSU composite coating with self-cleaning properties, wear resistance and corrosion resistance

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10930-10937 ◽  
Author(s):  
Huaiyuan Wang ◽  
Xiguang Zhang ◽  
Zhanjian Liu ◽  
Yixing Zhu ◽  
Shiqi Wu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Composite Coating ◽  
Water Contact Angle ◽  
Thermal Spraying ◽  
High Water ◽  
Water Contact ◽  
Slide Angle ◽  
Spraying Method

In this study, a superhydrophobic polysulfone (PSU) composite coating with a high water contact angle (WCA) of 159° and a low slide angle (SA) of only 3.5° has been fabricated through a simple thermal spraying method.

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.

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