Dehydrogenation-driven assembly of transparent and durable superhydrophobic ORMOSIL coatings on cellulose-based substrat
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ORIGINAL RESEARCH
Dehydrogenation-driven assembly of transparent and durable superhydrophobic ORMOSIL coatings on cellulose-based substrates Wensheng Lin . Xinxiang Zhang Hanxian Chen
. Qingshu Cai . Wenbin Yang .
Received: 15 November 2019 / Accepted: 12 June 2020 Ó Springer Nature B.V. 2020
Abstract A novel dehydrogenation-driven assembly method was proposed to fabricate durable superhydrophobic SiO2/PMHS ORMOSIL (organically modified silica) coatings on cellulose-based substrates. Poly(methylhydrogen)siloxane (PMHS) played the key role in the durability of ORMOSIL coatings and the assembly process. The dehydrogenation-driven assembly mechanism of ORMOSIL was discussed in detail. Results indicated that the chemical property and microstructure of ORMOSIL could be controlled easily by varying the weight ratio of SiO2 to PMHS. The lotus-like ORMOSIL coating could be realized as the weight ratio of SiO2 to PMHS was 1:1. The
ORMOSIL coating on wood surface was of selfcleaning property, good transparency and durability (including water-repellency and dimensional stability, mechanical and chemical stability, and UV-resistance). In addition, the SiO2/PMHS ORMOSIL gave cotton good oil/water separation ability. Finally, the dehydrogenation-driven assembly method was simple and low-cost, and it can be applied to fabricate durable superhydrophobic coatings on any other hydroxylcontaining substrates besides the cellulose-based substrates.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03288-2) contains supplementary material, which is available to authorized users. Wensheng Lin and Xinxiang Zhang have been contributed equally to this work. W. Lin X. Zhang (&) Q. Cai W. Yang H. Chen College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Superhydrophobic Organically modified silicate Assembly Dehydrogenation Coating
Introduction Cellulose, occurring in wood, cotton and other plantbased materials, is the most abundant biopolymers in nature (Siro´ and Plackett 2010). Wood has received wide applications in buildings, decoration, furniture, and also artificial board (Ramage et al. 2017; Frey et al. 2018), while the cotton was the prime constituent of natural fibers in textile industry (Gordon and Hsieh 2006). These cellulose-based materials possess some promising properties, such as renewability, biodegradability, biocompatibility and mechanical robustness (Zhao et al. 2017; Song et al. 2018). However, cellulose-based materials are prone to absorb water and moisture owing to their high hydrophilicity (Tu et al. 2018). The absorption of water and change in humidity renders wood susceptible to fungi and dimensional instability, resulting in cracking, mildew and biological degradation (Kumar et al. 2016; Wu et al. 2016). In addition to textile application, cotton is also applied as absorbent or
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