Fabrication of superhydrophobic and lyophobic slippery surface on steel substrate

Abstract

Superhydrophobic/oleophilic coating was prepared on steel via wet chemical etching, and followed by surface modification. Surface grafting was manifested to be realized mainly on the oxidized area. Slippery liquid infused porous surface(s) (SLIPS) was prepared by infusing perfluorinated lubricant into the prepared superhydrophobic coating, to repel water, coffee, kerosene, and even hexane, suggesting a transition from superoleophilicity to lyophobicity. Furthermore, the lyohobicity was accessible only when the substrate is fluorinated. Moreover, the kinematic viscosity was demonstrated to be negatively correlated to the traveling speed of the liquids on the SLIPS.