To fabricate hydrophilic/underwater superaerophobic coatings on various transparent materials
such as polystyrene (PS)
polypropylene (PP)
polymethylmethacrylate (PMMA)
polyimide (PI) and polyethylene terephthalate (PET)
a co-deposition method of polydopamine (PDA) and polyethyleneimine (PEI) is developed in this work. This method enables one to overcome the obstacle of the bubble adhesion phenomenon in the transparent materials used in underwater devices such as swim goggles and submarine windows. By adding PDA and PEI
a hydrophilic cross-linking network is formed on the material surface
via
Michael addition or Schiff-base reaction. The modified surface demonstrates improved hydrophilicity
and the water contact angle decreases from 80° to 66° while the submerged gas contact angle increases from 100° to 146°
exhibiting extremely low gas adhesion under water. All these materials are immersed into water during a continuous bubbling process
the PDA/PEI modified surfaces show great gas repellent ability in water on which no obvious bubbles are observed. XPS results and ellipsometer tests show that
with extended deposition time
the amount of the PDA/PEI coating and the thickness of the PDA/PEI coating grow. Meanwhile
the absorption of substrates increases slightly in the visible region with a deposition time below 6 h
which meets the requirements in high transparency and light transmittance. At the same time
the stability of the PDA/PEI coating is measured. After 10 days of submerging and shaking under water
the transparent materials maintain their hydrophilicity and underwater superaerophobicity after deposition
and the sheets exhibit extremely low gas adhesion during underwater bubbling process. Such coating can be applied on various transparent polymer materials such as PP
PMMA
PI and PET (all the submerged gas contact angles are above 140°)
which are promising to be used in many submerged devices such as swim goggles
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