A novel superhydrophobic coating consisting of SiC nanowires
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Abstract:
In this study, a novel superhydrophobic coating consisting of SiC nanowires was created for the first time via atmospheric pressure chemical vapor deposition (APCVD) method. Results of the research indicated that the novel superhydrophobic coating was composed of countless β-SiC nanowires coated with methyl groups (-CH3) and it was proved that the SiC nanowires coating possessed superhydrophobic properties. In addition, the growth process of the nanowires coating was investigated on the basis of Vapor-Liquid-Solid mechanism, and a potential hydrophobic mechanism was proposed. The methyl groups on the surface of SiC nanowires reduced the overall surface free energy of the SiC nanowires coating which led to a increase in the contact angle of the SiC nanowires coating.Keywords:
Superhydrophobic coating
Deposition
Liquid metal
Wetting transition
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Inverse gas chromatography
Wilhelmy plate
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It is recognized that the non-dispersive components, γab, of the surface free energies, γ, play an important role in the interactions of a polymer with other substrates. Because of the difficulty in measuring the surface free energy of a solid polymer surface, many methods to estimate γ have been developed. The purpose here is to examine how to characterize a high energy polymer surface using our recently proposed model and the modified two-liquid contact angle technique. First, the dispersion component, γd, of surface free energy of polystyrene (PS) is obtained by measuring the contact angles of water on PS surface in a series of n-alkanes. Its γab is then calculated by our three-parameter semi-empirical model using the contact angle data of several key non-alkane liquids on the surface. Given the surface thermodynamic parameters, our model also enables us to calculate the interfacial free energies, γSL, between PS and other liquids. An attempt to relate γSL to the equilibrium concentrations of crazing solvents in PS is presented.
Polystyrene
Crazing
Goniometer
Surface Modification
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The paper studies on surface wettability characterization of fabric by using contact angle. According to surface tension of liquid, contact angle between liquid and fabric, based on Owens model, the surface energy of nonwoven surface that has water repellent finishing (sample 2) is 29.54 mN/m, and nonwoven surface that hasn’t water repellent finishing (sample 1) is 43.99 mN/m. The essence of water-repellent finishing is to reduce solid surface energy. The surface tension of liquid drop is lower; the contact angle of droplet and fabric surface is smaller.
Water repellent
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A new method named polymer plating was developed for surface modification of stainless steel plates with different functional groups of organic solutions.The polymer-plated films on the surface of stainless steel plates were characterized by Fourier transform infrared spectra,contact angle and surface free energy.Compared with untreated stainless steel plate,the surface polymer-plated by TTN possessed hydrophilic characteristic with higher surface free energy and lower contact angle of distilled water,however,the polymer-plated films by DHN and AF17N had hydrophobic feature with lower surface free energy and higher contact angle of distilled water,where AF17N polymer-plated surface obtained optimal hydrophobicity because of the lowest surface free energy and the highest contact angles.This technique achieved the hydrophilic/hydrophobic modification on surface of stainless steel,and provided a method for fabricating polymeric function film with different wettability.
Distilled water
Surface Modification
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Surface Modification
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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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Hysteresis
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