A facile process for preparing superhydrophobic PBZ-PTFE coating with excellent stable properties
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Superhydrophobic coating
Surface roughness of part was vital to its application.40Cr material was irradiated by large scale pulse electron beam with orthogonal experiment and the surface roughness was checked.The results indicate that the surface roughness of 40Cr is changed by different electron beam parameters.Surface roughness of part increases or decreases in terms of electron beam parameter.The samples with high and low surface roughness are tested with electron beam respectively.The results show that the surface roughness decreases with irradiation numbers increasing in high original surface roughness,contrary surface roughness increases with irradiation numbers increasing in low original surface roughness.It is analysed that the surface roughness is influenced in two opposite sidedness when it is modified on the surface with pulsed electron beam.
Electron beam processing
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It is necessary to pretreat insulators before measuring the hydrophobicity of the composite insulators,however,the necessity of such pretreatment is questionable for the operating composite insulators.Therefore,we investigated the surface roughness of the light polluted shed,heavily polluted shed,chalking shed and the impact of surface roughness on hydrophobicity characteristic.Experimental results indicate that pretreatments on HC levels and static contact angles have a remarkable effect,totally different results can be obtained in the HC level test,and the static contact angle changes up to 15.3%.The surface roughness Raand RSM of sheds with different pollution levels change up to 130% and 269% after pretreatment.The composite insulators with high surface roughness degree totally lose the hydrophobicity,of which Raand RSMare 3.242μm and 400μm,respectively.The surface roughness can cause changes in the water drop's status and consequent changes in the static contact angle up to 31% in 10min,leading to difference between the results of the HC levels test and the static contact angle test.Thus the data of surface roughness for the composite insulators were suggested to be added into the hydrophobicity tests.
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Superhydrophobic surfaces were prepared using a very simple and low-cost method by spray coating. A high static water contact angle of about 154° was obtained by deposition of stearic acid on an aluminium alloy. However, this coating demonstrated a high contact angle hysteresis (~ 30º). On the other hand, superhydrophobic surfaces with a static contact angle of about 162º and 158º, and a low contact angle hysteresis of about 3º and 5º were respectively obtained by incorporating nanoparticles of SiO 2 and CaCO 3 in stearic acid. The excellent resulting hydrophobicity is attributed to the synergistic effects of micro/nanoroughness and low surface energy. A study of the wettability of these surfaces at temperatures ranging from 20 to-10 °C showed that the superhydrophobic surface becomes rather hydrophobic at supercooled temperatures.
Stearic acid
Superhydrophobic coating
Hysteresis
Deposition
Supercooling
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Superhydrophobic coating
Anodizing
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Hysteresis
Wetting transition
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Hydrophobic surface can be achieved by synergistic effect of lowering of surface energy and increase in surface roughness. Present work emphasizes on the development of thin hydrophobic sol-gel coatings on aluminium substrate using a long chain C-16 silane precursor i.e., Hexadecyltrimethoxysilane (HDTMS) crosslinked with Glycidoxypropyltrimethoxysilane (GPTMS) and Tetraethoxyorthosilcate (TEOS), in varying concentrations. Condensation and hydrolysis reactions of all three silane precursors resulted in hydrophobic sol-gel coating with a contact angle greater than 90. This can be attributed to the self assembled, low energy HDTMS groups on the surface. By further, enhancing the surface roughness of the aluminium substrate, before coating application, using various etching solutions, it was possible to achieve enhanced hydrophobicity with contact angle of about 130 and sliding angle of 20. Surface morphology, surface roughness and hydrophobicity of the coating were characterized using SEM, AFM and water contact angle analysis, respectively.
Superhydrophobic coating
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We study the nonwettability and transparency from the assembly of fluorosilane modified silica nanoparticles (F-SiO2 NPs) via one-step spin-coating and dip-coating without any surface postpassivation steps. When spin-coating the hydrophobic NPs (100 nm in diameter) at a concentration ≥0.8 wt % in a fluorinated solvent, the surface exhibited superhydrophobicity with an advancing water contact angle greater than 150° and a water droplet (5 μL) roll-off angle less than 5°. In comparison, superhydrophobicity was not achieved by dip-coating the same hydrophobic NPs. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) images revealed that NPs formed a nearly close-packed assembly in the superhydrophobic films, which effectively minimized the exposure of the underlying substrate while offering sufficiently trapped air pockets. In the dip-coated films, however, the surface coverage was rather random and incomplete. Therefore, the underlying substrate was exposed and water was able to impregnate between the NPs, leading to smaller water contact angle and larger water contact angle hysteresis. The spin-coated superhydrophobic film was also highly transparent with greater than 95% transmittance in the visible region. Further, we demonstrated that the one-step coating strategy could be extended to different polymeric substrates, including poly(methyl methacrylate) and polyester fabrics, to achieve superhydrophobicity.
Superhydrophobic coating
Spin Coating
Dip-coating
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We have developed a combination of electro –deposition and spraying methods to prepare water-repellent tin oxide/ polytetrafluoroethylene(SnO2/PTFE) coating. The coating has a high water contact angle. The resulting porous and lowest surface energy hydrophobic groups (－CF3) has a water contact angle of 165° and a sliding angle of 7°, showing super-hydrophobic property. The coating with good adhesion on substrates and the long-term stability can be fabricated on various metal substrates.
Superhydrophobic coating
Polytetrafluoroethylene
Deposition
Tin oxide
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Polydimethylsiloxane
Superhydrophobic coating
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Polydimethylsiloxane
Superhydrophobic coating
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