Nanocellulose-based superhydrophobic coating

A nanocellulose-based multiple-functional coating was fabricated with excellent superhydrophobicity, abrasion resistance, acid resistance and fluorescence.

A laboratory scene as a symbolic image.
GO/WEP composite coatings with a high cross-linking degree Image source: deepakrit - Pixabay (symbol image).

Fluorescent cellulose nanofibril (FCNF) was used to construct 2–8 μm microparticles with many gullies by spray drying, which were hydrophobically modified by MTMS. A superhydrophobic coating was formed by combining the MTMS-modified microparticles and polydimethylsilane (PDMS), and coated on filter paper and wood block. The coated paper and the wood block had the water contact angles (WCA) 156.6° and 162° with sliding angle <10°.

Acid corrosion resistance properties

The coating layers remained superhydrophobic after being immersed in hydrochloric acid solution of pH 1, 4, and 0.1 M NaCl solution for 4 h. In addition, the obtained coating possessed excellent friction resistance, which remained the WCA of 150.8° after 50 frictions with 200 g weight. The good folding and crimping resistance, self-cleaning and acid corrosion resistance properties were reported as well. According to the researchers, this fluorescent superhydrophobic coating is promising to be implemented as outer building materials to prevent acid corrosion, luminous decorative materials and anti-counterfeiting materials.

The study has been published in Progress in Organic Coatings, Volume 168, July 2022.

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