Facile preparation and property analyses of L-CNC/SiO<sub>2</sub>-based composite superhydrophobic coating

doi:10.1007/s11706-022-0626-4

Front. Mater. Sci.

2022, Vol. 16

Issue (4) : 220626 https://doi.org/10.1007/s11706-022-0626-4

RESEARCH ARTICLE

Facile preparation and property analyses of L-CNC/SiO₂-based composite superhydrophobic coating

Wentao HUANG, Qihui YE, Changying REN, Youwei LU, Yuxin CAI, Wenbiao ZHANG, Jingda HUANG(

)

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China

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Abstract

In recent years, superhydrophobic coatings have received extensive attention due to their functions of waterproof, antifouling, self-cleaning, etc. However, wide applications of superhydrophobic coatings are still affected by their disadvantages of complex preparation, low mechanical properties, and poor ultraviolet (UV) resistance. In this study, cellulose nanocrystal containing a small amount of lignin (L-CNC)/SiO₂ composite particles were used as the main material, polydimethylsiloxane (PDMS) as the adhesive and perfluorooctyltrichlorosilane (FOTS) as the modifier to prepare superhydrophobic coatings by a one-step spray method. The resulted coating showed excellent superhydrophobicity (water contact angle (WCA) of 161° and slide angle (SA) of 7°) and high abrasion resistance (capable of withstanding 50 abrasion cycles under the load of 50 g). Moreover, it still maintained good superhydrophobicity after 5 h of exposure to the UV light (1000 W), displaying its good UV resistance. This study provides theoretical and technical reference for the simple preparation of organic‒inorganic composite superhydrophobic coatings with high abrasion resistance and good UV resistance, which is beneficial to improving the practicability and broadening the application scope of superhydrophobic coatings.

Keywords superhydrophobic coating L-CNC/SiO₂ abrasion resistance UV resistance

Corresponding Author(s): Jingda HUANG

Issue Date: 25 December 2022

Cite this article:

Wentao HUANG,Qihui YE,Changying REN, et al. Facile preparation and property analyses of L-CNC/SiO₂-based composite superhydrophobic coating[J]. Front. Mater. Sci., 2022, 16(4): 220626.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-022-0626-4
https://academic.hep.com.cn/foms/EN/Y2022/V16/I4/220626

Fig.1 Preparation demonstration of the L-CNC/SiO₂ composite superhydrophobic coating.

Fig.2 Water droplet states on (a) unmodified L-CNC/SiO₂, (b) modified pure SiO₂, and (c)(d)(e) modified L-CNC/SiO₂-coated woods with different contents of L-CNC.

Fig.3 FTIR spectra of L-CNC/SiO₂ composite particles before and after the modification.

Fig.4 XRD patterns of L-CNC/SiO₂ composite particles before and after the modification.

Fig.5 Photos showing (a) the CNC aqueous suspension and (b) the L-CNC powder. SEM images of (c) L-CNC particles and (d)(d₁)(e)(e₁)(f)(f₁) L-CNC/SiO₂ composite superhydrophobic coatings containing 1, 5, and 10 wt.% of L-CNC. (g) Schematic representation of the superhydrophobicity of L-CNC/SiO₂ composite particles corresponding to the Cassie–Baxter model.

Fig.6 Variation curves of WCA and SA of L-CNC/SiO₂ composite superhydrophobic coatings with L-CNC of (a) 0% (pure SiO₂), (b) 1 wt.%, (c) 5 wt.%, and (d) 10 wt.% as the increased abrasion cycles.

Fig.7 SEM images of L-CNC/SiO₂ composite superhydrophobic coatings with L-CNC of (a)(a₁) 1 wt.%, (b)(b₁) 5 wt.%, and (c)(c₁) 10 wt.% after abrasion.

Fig.8 Variations of WCA and SA for L-CNC/SiO₂ composite superhydrophobic coatings containing different L-CNC contents of (a) 0% (pure SiO₂), (b) 1 wt.%, (c) 5 wt.%, and (d) 10 wt.% with the UV irradiation time.

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