Superhydrophobic Hybrid Inorganic–Organic Thiol-ene Surfaces Fabricated via Spray-Deposition and Photopolymerization

Abstract

We report a simple and versatile method for the fabrication of superhydrophobic inorganic-organic thiol-ene coatings via sequential spray-deposition and photopolymerization under ambient conditions. The coatings are obtained by spray-deposition of UV-curable hybrid inorganic-organic thiol-ene resins consisting of pentaerythritol tetra(3-mercaptopropionate) (PETMP), triallyl isocyanurate (TTT), 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (TMTVSi), and hydrophobic fumed silica nanoparticles. The spray-deposition process and nanoparticle agglomeration/dispersion provide surfaces with hierarchical morphologies exhibiting both micro- and nanoscale roughness. The wetting behavior, dependent on the concentration of TMTVSi and hydrophobic silica nanoparticles, can be varied over a broad range to ultimately provide coatings with high static water contact angles (>150°), low contact angle hysteresis, and low roll off angles (<5°). The cross-linked thiol-ene coatings are solvent resistant, stable at low and high pH, and maintain superhydrophobic wetting behavior after extended exposure to elevated temperatures. We demonstrate the versatility of the spray-deposition and UV-cure process on a variety of substrate surfaces including glass, paper, stone, and cotton fabric.

Analysis of wear abrasion resistance of superhydrophobic acrylonitrile butadiene styrene rubber (ABS) nanocomposites

“…They are frequently used as thickening agent and viscosity stabilizer in cosmetics, toothpastes, food additives, antiperspirant sprays, medicines, paints, coatings, printing inks, adhesives, etc. Lately, HMFS combined with different organic materials has been used for spray deposition of nanocomposite superhydrophobic coatings for various substrates [51,52]. Their unique agglomeration pattern characteristics in polymer matrices provide the desirable hierarchical morphology comprising both micro-and nano-meter scale roughness typically required for superhydrophobic wetting behavior.…”

Effect on superhydrophobic surfaces on electrical porcelain insulator, improved technique at polluted areas for longer life and reliability

“…As explained by Cassie [1,3], a liquid droplet residing on the composite surface (here especially for the composite surface of air and solid) has a resulting contact angle in the form of cos θ * = -1+ φ s (1+cos θ), where in above equation 'φ s 'designates the fraction of solid surface being in touch with the liquid drop, and 'θ * ' is the intrinsic contact angle of the flat surface with the same chemical components. Various techniques have been developed to produce the lotus leaf effect such as phase separation [4], chemical vapour deposition [5,6], sol-gel processing [7][8][9][10][11], chemical etching [12,13] electro spinning [14][15][16][17][18], self-assembly [19][20][21][22][23]. Most of the techniques require special equipment and cannot be used on different kind of materials.…”

Fabrics coated with hot-iron-treated graphene oxide for a self-cleaning and mechanically robust water–oil separation material

“…The spray-deposition process and nanoparticle agglomeration/dispersion provide surfaces with hierarchical morphologies exhibiting both micro-and nanoscale roughness. 7 Kim et al used PTFE-TiO 2 nanocomposite lms with superhydrophobic and superhydrophilic properties, deposited by a supersonic spray coating technique. Wettability tuning was achieved by simply varying the relative ratio of PTFE and TiO 2 .…”

“…A black coating became transparent aer calcination at 600 C. 11 However, up to now, most hydrophobic fabrics are produced by sophisticated processes need expensive equipment and/or rigid conditions to modify surface properties. 7 In addition, such surface textures are highly susceptible to mechanical wear and abrasion may transform the surface chemistry as well.…”