Fabrication Of Fluorosilicone Superwetting Surfaces And Application In Anti-fouling And Anti-icing Coatings

Superwetting surfaces,especially superhydrophobic and slippery surfaces have received significant attention in the recent years.Superhydrophobic surfaces are refered to material with stable water contact angle greater than 150° and rolling angle less than 10°.Superhydrophobicity could be achieved by combination of low surface energy and micro/nanoscale roughness.Slippery liquid-infused porous surfaces(SLIPS)are engineered by infusion of fluorinated lubricant in micro/nanostructural roughnesss.In this paper,we designed superhydrophobic surfaces and SLIPS and expanded their applications in the filed of antifouling and anti-icing.A facile and effective sol-gel method for fabricating superhydrophobic surface with highly omniphobic and self-cleaning properties was synthesized via hydrolytic condensation of methyltriethoxysilane,3-[(perfluorohexyl sulfonyl)amino]propyltriethoxysilane,and nanosilica sol.The solvent surrounding the hydrophobic nanosilica is a key factor in the control of nanoparticle aggregation,which leads to the formation of multi-scale roughness surface with different wettability.The CA values on omniphobic surface for water and hexadecane are 158°and 134°,respectively.The fluorinated nano-sol can be easily coated on various hard and soft substrates such as metal,glass,fabric and paper,endowing the substrates with excellent self-cleaning and anti-adhesion properties in various harsh environments such as high temperature,acid and alkaline treatment and oil contaminate.Owing to the simple method and its remarkable omniphobic abilities,the fluorinated hybrid coatings can be expected to have potential industry applications in a material system requiring robust antifouling,protein resistance and self-cleaning functions.Robust transparent slippery hybrid coatings(SHCs)were easily fabricated by the immersion of sol-gel-derived nanocomposite coatings in silicone oils of varying viscosity.The storage capacity of silicon oils are intensified by the abundant internal cross-linked networks,the nanoscale textures of the HCs and capillary action.SHCs exhibited outstanding long-term slippery stability with the contact angle hysteresis below 5°,even under extreme operating conditions such as high shear rate,elevated evaporation,and flowing aqueous immersion.CFU counts of static bacteria culture tests confirmed a decrease of 2 orders of magnitude in the SHCs compared to control glass and HC samples.In addition,bovine serum albumin adhesion experiments were conducted after lubricant loss tests,showing the protein absorption of SHCs less than 6?g/cm2.The unique ultralow bacterial attachment and remarkably long-term protein-resistant performance render the as-prepared SLIPS as a promising candidate for biomedical applications even under harsh environmental conditions.To further reveal the properties of superwetting surfaces in anti-icing fields,a robust superhydrophobic fluorous coating(FC)and slippery fluorous coating(SFC)were prepared.Then we compared the ice and frost formation on blank hydrophilic surface,strong hydrophobic HC and FC,slippery SHC and SFC.DSC was used to test the crystallization point of water on different surfaces,and the results demonstrated that the crystallization point can depressed to-17?on the prepared surfaces.The freezing time were delayed to 1000 s on slippery surface,which was 20 times than on glass.The adhesion strength is significantly decreased to 0.1 N on slippery surfaces,3 orders of magnitude lower than glass and hydrophobic surfaces.The frost formation was investigated in low temperature and high humidity and slippery surface showed effective antifrosting behavior.The research opens up new ways of designing bioinspired superwetting and anti-icing materials.