Abstract
Preparation of robust oil-repellant surfaces in aqueous environment with mechanical stability is imperative, yet challenging for the extensive range of real applications where high durability is required. We report the robust underwater superoleophobic properties of mineral surfaces coated with a nanofluid based on synthesized TiO2/Al2O3 nanocomposites functionalized by poly(vinyl alcohol) (PVA). The produced nanofluid demonstrated predominant stability in harsh environments including acid/base solutions, saline solutions with strong ionic strength and high temperature–high pressure conditions. The sandpaper abrasion test (grit numbers 400, 240 and 180; 57 kPa) exhibited that the obtained coating retains its functions significantly after suffering the abrasion distance of 16000 cm. Meanwhile, the multifunctional coating nanofluid impart properties of self-cleaning. A crude oil droplet released at height of 9 mm from the coated surface undergoes first a lateral movement from its trajectory and misshaping, touching the surface after 300 ms, bouncing and rolling off easily with no tilt of solid substrate. This durable underwater superoleophobic nanofluid has thermal stability up to 150 °C; novel industrial applications include within Chemical Enhanced Oil Recovery (CEOR) methods applied to produce trapped oil from naturally oil-wet reservoirs.
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