Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 18, Pages 8376-8384Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta01302g
Keywords
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Funding
- IISER, Pune
- MHRD, India through the FAST program
- DST nanomission, India
- Enovex Tech. Corp., Canada
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Covalent organic frameworks are crystalline polymers with modular tunability and ordered pores. If made super-hydrophobic, owing to their flexibility, texture and organic nature, they can be of use in several applications that demand hydrophobic surfaces. Super-hydrophobic surfaces have been developed by introducing micro/nano-asperities on metal surfaces by laser-etching or by nano-structuring their morphologies. Many industrial applications demand super-hydrophobicity under chemically harsh environments, something which such metal-based metastable surfaces cannot guarantee. Evidently, the most abundant are metal-free fluorine based polymer surfaces, but considering long-term environmental benefits developing fluorine-free alternatives is important. Here, porous super-hydrophobic COFs with 2D and pseudo-3D frameworks have been utilized to make coatings with exceptional water-repelling characteristics assisted by their Cassie-Baxter state (contact angle = 163 +/- 2 degrees; tilt-angle = 2 degrees, hysteresis = 4 degrees). Importantly, the coatings maintain their super-hydrophobicity even under harsh acidic/basic conditions (pH = 1-14) and towards ice and hot water (80 degrees C), something where even a lotus leaf fails. Also, their organic nature and fibrous texture enable their facile compositing with paper and textiles. At a mere <5% loading, the COFs seem to pack very well within the cellulose strands of these materials providing a markedly hydrophobic coating to these otherwise completely hydrophilic materials.
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