Nonswellable hydrogels with robust micro/nano-structures and durable superoleophobic surfaces under seawater
2018
Hydrogels, composed mainly of water trapped in three dimensional
cross-linked polymer networks, have been widely utilized to construct
underwater superoleophobic surfaces. However, the swelling nature
and instability of hydrogels under complex marine environment will
weaken their underwater superoleophobicity. Herein, we synthesize
structured poly (2-hydroxyethylmethacrylate) (PHEMA) hydrogels by
using sandpaper as templates. The robust non-swelling of PHEMA hydrogel
ensures that micro/nano-structures on the surface of PHEMA hydrogels
can be well maintained. Moreover, when roughness Ra of about 3~4 μm, the surface has superior oil-repellency. Additionally, even after
immersing in seawater for one-month, their breaking strength and toughness
can be well kept. The non-swellable hydrogels with long-term stable
under seawater superoleophobicity will promote the development of
robust superoleophobic materials in marine antifouling coatings, biomedical
devices and oil/water separation.
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