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. 2021 Oct 20:9:756839.
doi: 10.3389/fbioe.2021.756839. eCollection 2021.

A Superhydrophobic Moso Bamboo Cellulose Nano-Fibril Film Modified by Dopamine Hydrochloride

Yan Wu  1   2 , Wanying Zhao  1   2 , Xinyu Wu  1   2 , Jian Gan  1   2 , Haiqiao Zhang  1   2 , Yijing Cai  1   2
Affiliations
Free PMC article

A Superhydrophobic Moso Bamboo Cellulose Nano-Fibril Film Modified by Dopamine Hydrochloride

Yan Wu et al. Front Bioeng Biotechnol. .
Free PMC article

Abstract

The moso bamboo fiber powder was used as raw material to prepare cellulose nano-fibril films, 5% of polyvinyl alcohol solution was used as a structural reinforcement agent, dopamine hydrochloride (DA) was used as a surface adhesive, and hexadecyl trimethoxy silane was used as a surface modifier. The superhydrophobic films were prepared by vacuum filtration and impregnation. The results showed that the water contact angle on the surface of the film could reach 156°. The microstructure and chemical composition of the film surface was further studied by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), and roughness measurement The scanning electron microscopy images showed that the nanofibers on the surface of Cellulose nanofibers film were arranged and randomly distributed, thus forming a dense network interwoven structure. In PDA hydrophobic modification solution, an Hexadecyltrimethoxysilane was hydrolyzed to a hexadecyl silanol to obtain the polar terminal hydroxyl of Hexadecyl silanol molecule. The -OCH3 terminal group of HDTMS reacted with hydroxyl/H2O to form a silanol (Si-OH) bond and further condensed to form a Si-O-Si network. In addition, due to the hydrophilicity of the surface of the nano cellulose film, a large amount of-OH was adsorbed on the surface of the nano cellulose film, resulted in the chemical connection between cetyl groups, thus realized the grafting of cetyl long-chain alkyl groups onto the fibers of the nano cellulose film.The film showed good self-cleaning and waterproof properties, which can be widely used in wet environment packaging and building.

Keywords: bamboo fiber; cellulose nano-fibril; contact angle; film; superhydrophobicity.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Diagram of the CNF/PVA/PDA preparation process.
FIGURE 2
FIGURE 2
The mechanism of droplet formation on CNF/PVA/PDA film surface.
FIGURE 3
FIGURE 3
SEM images of CNF, CNF/PVA and CNF/PVA/PDA films (A) at 200 magnification; (B) at 400 magnification; (C) at 800 magnification), CNF/PVA (D) at 200 magnification; (E) at 400 magnification; (F) at 800 magnification) and CNF/PVA/PDA (G) at 200 magnification; (H) at 400 magnification; (L) at 800 magnification) films.
FIGURE 4
FIGURE 4
Roughness of CNF, CNF/PVA and CNF/PVA/PDA films.
FIGURE 5
FIGURE 5
Light transmittances of CNF, CNF/PVA, and CNF/PVA/PDA.
FIGURE 6
FIGURE 6
FTIR of CNF, CNF/PVA, CNF/PVA/PDA films.
FIGURE 7
FIGURE 7
The tensile strength of CNF, CNF/PVA, CNF/PVA/PDA films.
FIGURE 8
FIGURE 8
Self-cleaning test CNF/PVA/PDA.
FIGURE 9
FIGURE 9
Self-cleaning test CNF/PVA/PDA (A,B): methylene blue; (C,D) sudan red; (E,F) coffee juice; (G,H) milk juice).
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