A novel slippery surface with enhanced stability and corrosion resistance

Abstract

Herein, slippery liquid infused porous surface (SLIPS) was prepared by a facile spraying method with co-introduction of silica sol and carbon nanotubes (CNTs) and subsequent oil infusion. Abundant micropores and nanopores were formed during the solvent evaporation and silica sol shrinkage in molten PVDF process, both of which functioned as reservoirs to hold oil. Then the effects of CNTs on oil-holding capability and corrosion inhibition mechanism were investigated in detail. The interaction between SiO2 nanoparticles and CNTs endowed original hierarchical structures with more abundant morphologies and micropores quantities increasing. These two factors synergistically enhanced oil-locking ability, indicating more stable properties of SLIPS. With only 0.58 wt. % CNTs incorporation in SLIPS, it could lock 12 % more oil than unincorporated one under increasing high shear rates up to 5000 rpm/min. The Electrochemical Impedance Spectroscopy (EIS) results indicated that the |Z|0.01Hz of optimum SLIPS remained 1.41 × 109 after 10 days immersion in 3.5 wt. % NaCl solution, nearly 2 orders of magnitude higher than that of untreated SLIPS. The optimum SLIPS could maintain slippery properties even when subjected to some harsh manipulating environments including 12 h immersion in strong acid/alkali immersion, high temperature and abrasion.