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Springtail-inspired omniphobic slippery membrane with nano-concave re-entrant structures for membrane distillation
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Springtail-inspired omniphobic slippery membrane with nano-concave re-entrant structures for membrane distillation
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Journal Article
Springtail-inspired omniphobic slippery membrane with nano-concave re-entrant structures for membrane distillation
2024
Overview
Omniphobic membranes, due to their exceptional properties, have drawn significant attention for overcoming the bottleneck in membrane distillation (MD) technology. This study demonstrates an innovative method for fabricating an omniphobic membrane that is simple and facile compared to other methods such as wet/dry etching and photolithography. The surface morphology of springtails was imitated using electrospraying technique to coat a polyvinylidene fluoride substrate with concave-shaped polystyrene beads that were successfully developed by controlling the electrical traction (voltage) and air resistance (humidity). Then, the lipid coating of springtail surfaces was mimicked by dip-coating the membrane in a low-toxicity short-chain perfluoropolyether lubricant. The concave structure’s tiny air pockets increased membrane hydrophobicity significantly, indicated by the fact that the first round of water bouncing took only 16.3 ms. Finally, in MD treatment of seawater containing 1.0 mM sodium dodecyl sulfate, the optimized omniphobic membrane maintained a stable 99.9% salt rejection rate.
Here, authors successfully fabricated a springtail-inspired nano-concave reentrant structured polystyrene (PS) membrane using electrospraying technology followed by lubricant dip-coating, which endowed the membrane with omniphobic properties.
