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.

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

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 Superhydrophobicity/Superhydrophilicity Transformation of Transparent PS-PMMA-SiO2 Nanocomposite Films

2018 ◽  
Vol 63 (3) ◽  
pp. 226 ◽  
Author(s):  
A. Sriboonruang ◽  
T. Kumpika ◽  
W. Sroila ◽  
E. Kantarak ◽  
P. Singjai ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
High Water ◽  
Dip Coating ◽  
Nanocomposite Films ◽  
Water Contact ◽  
Treatment Conditions ◽  
Coating Method

A transparent superhydrophobic nanocoating with high water contact angle (>150∘ ) was successfully prepared by a simple dip coating method. The coating solutions were prepared by the dissolution of polystyrene (PS) and poly(methyl methacrylate) (PMMA) in toluene. Fumed silica (SiO2) was then added to increase the roughness of the coating. The annealing treatment conditions were investigated to optimize the water contact angle. The heat treatment conditions and other factors were studied systematically to optimize the transmission and the contact angle of water on the films. The results have shown that the films increase with the annealing temperature. The superhydrophobicity of films is observed only in PS-consisted films after the annealing at 200 ∘C. The superhydrophobic/superhydrophilic transformation was achieved at the annealing temperature higher than 200 ∘C due to the decay of the polymer into hydrophilic monomers.

scholarly journals Synthesis of Silphenylene-Containing Siloxane Resins Exhibiting Strong Hydrophobicity and High Water Vapor Barriers

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 481
Author(s):  
Chen ◽  
Yi ◽  
Wu ◽  
Tan ◽  
Xu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Vapor ◽  
Water Contact Angle ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
High Water ◽  
Vapor Permeability ◽  
One Pot ◽  
Water Contact ◽  
Thermal Stabilities

The novel phenylenedisilane, 1,4-bis(dimethoxyphenylsilyl)benzene (BDMPD), was successfully synthesized via the reaction between trimethoxyphenylsilane (TMPS) and a Grignard reagent originating from 1,4-dibromobenzene. In comparison to common Grignard reactions, this process was a facile one-pot method. 1H NMR spectroscopy, FT-IR measurements, and elemental analysis confirmed the predicted structure of BDMPD. In addition, vinyl-terminated polysiloxanes containing silphenylene units (VPSSP), which were hydrolytically copolymerized from BDMPD, TMPS, and divinyltetramethyldisiloxane, exhibited excellent thermal stabilities (T10%: 502 °C, Rw%: 76.86 beyond 700 °C) and suitable refractive indices (1.542). Furthermore, water contact angle and water vapor permeability tests confirmed that the fully cured siloxane resins containing VPSSP-based silphenylene units exhibited strong hydrophobicity (water contact angle: 119°) and superior water vapor barrier properties, thereby indicating their potential to serve as strong waterproof coatings for moisture-proof applications or as adhesives for use in immersed equipment.

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