Effect of Nanoparticle-Filled Lubricant Layer on Fluoropolymer Slippery Liquid-Infused Porous Surface

In this study, the macroinitiator poly(hexafluorobutyl methacrylate) (PHFBMA) was first prepared by atom transfer radical polymerization (ATRP) method, and then PHFBMA-b-PHEMA block copolymer was prepared by ATRP method using hydroxyethyl methacrylate (HEMA) as the monomer. After that, the amphiphilic diblock copolymer was used to construct a porous membrane using breath figures. Surface hydrophobicity is one of the important properties of materials. It is inspired by the principle of nepenthes predation, that the slippery liquid-infused porous surface (SLIPS) mimics the inner wall structure of the pitcher plant. In order to enhance the surface hydrophobicity of the fluoropolymer coating, the silicone oil infused on the ultra-slip surface is innovatively modified by nano-SiO₂ filling. When the content of polysiloxane is unchanged (10 mL for silicone oil and 0.5 g for polysiloxane), the modified silicone oil filled with 1.5 g of nano-SiO₂ owns the best modification effect at the film concentration of 37.5 mg/mL. The results show that the hydrophobic properties of the SLIPS are greatly improved compared with the porous film. The water contact angle of SLIPS is 160^o, the sliding angle of SLIPS is 7°. In addition, due to the presence of surface silicone oil, the SLIPS has good resistance to bacterial adhesion.