Design and fabrication of superamphiphobic coating based on raspberry-like F–SiO2@PSA hybrid nanocomposite particles

Emulsifier-free polymerization was employed to prepare the submicron spherical PSA (the copolymer of styrene and acrylic acid), then SiO2 was grown on the surface of the PSA by sol-gel method to form F–SiO2@PSA particles. It was found that when styrene: acrylic acid = 2.5:1 and tetraethyl orthosilicate: PSA was between 2.17:1 and 6.38:1, a perfect raspberry-like structure could be obtained. The coating based on F–SiO2@PSA particles exhibited contact angles of 167.3 ± 1.4°, 152.1 ± 1.5°,150.3 ± 1.6°, 150.9 ± 1.6°, 142.2 ± 1.7°, 143.7 ± 1.5° and 146.6 ± 1.9° to water, diiodomethane, soybean oil, rapeseed oil, hexadecane, kerosene, and waste engine oil, respectively. The F–SiO2@PSA coating could reduce the adsorption of protein by 90% compared with the control surface. It was observed that bacteria and platelets could hardly adhere to the coating surface after 24 h of E. coli culture and 3 h of platelet-rich plasma immersion. The anti-adhesion to proteins, platelets, and bacteria will give the coating a promising application in the medical field.