Underwater superoleophobic coatings with improved robustness

Oil contamination is problematic in subaqueous environments. In a study, a facile and low-cost immersion-curing approach has been developed to generate superhydrophilic and underwater superoleophobic coatings.

Underwater superoleophobic coatings with improved transparency and robustness. Source: pixabay.com -

During immersion curing, polymeric dissolution occurs simultaneously with crosslinking but occurs solely at the topmost layer, and helps to create enriched hierarchical surface micro-/nanostructures. Hence, superhydrophilicity is attainable for nanocomposite coatings with a filler percentage of only 15 wt%.

Free from oil in aqueous environments

Immersion-cured PVA/SiO2 nanocomposite coatings with 35 wt% silica have an excellent underwater superoleophobicity in terms of durability and ultra-low oil adhesion towards a variety of oils, including viscous crude oil. Because of its lower filler content and confined porous structure, this coating has a greater transparency compared with its conventional blend-curing underwater superoleophobic counterpart. Immersion-cured nanocomposite coatings display an excellent mechanical durability based on pencil hardness (3H) and sand-abrasion performance. The extra acrylic/melamine base-coat allows the coatings to be applied to diverse substrates, including glass, metals, and plastics, and renders them free from oil in aqueous environments.

The study is published in: Journal of Chemistry A, Issue 22, 2017.

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