NDLI: Super-hydrophobic covalent organic frameworks for chemical resistant coatings and hydrophobic paper and textile composites

Content Provider	Royal Society of Chemistry (RSC)
Author	Shalini, Sorout Nandi, Shyamapada Mullangi, Dinesh Choksi, Bhavin Vaidhyanathan, Ramanathan
Copyright Year	2017
Abstract	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°; tilt-angle = 2°, hysteresis = 4°). Importantly, the coatings maintain their super-hydrophobicity even under harsh acidic/basic conditions (pH = 1–14) and towards ice and hot water (80 °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.
Starting Page	8376
Ending Page	8384
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	18
Journal	Journal of Materials Chemistry A
DOI	10.1039/c7ta01302g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Baxter Hydrophobe Metastability Fluorine Polymer Contact angle Hysteresis Cellulose Hydrophile
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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