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Underwater writable and heat-insulated paper with robust fluorine-free superhydrophobic coatings. 2020

Zhibin Jiao, and Wencai Chu, and Linpeng Liu, and Zhengzhi Mu, and Bo Li, and Ze Wang, and Zhiwei Liao, and Yuchen Wang, and Hao Xue, and Shichao Niu, and Saihua Jiang, and Zhiwu Han, and Luquan Ren
Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China. niushichao@jlu.edu.cn zwhan@jlu.edu.cn.

Since its invention invented in China, paper has been widely used in the world for quite a long time. However, some intrinsic defects servely hinder its application in some extreme conditions, such as underwater or in fire. Herein, a bio-inspired durable paper with robust fluorine-free coatings was fabricated via a two-step spray-deposition technique. It not only consisted of modified SiO2 microspheres and nanoparticles, but also contained an epoxy resin, endowing the paper with multifunctional properties. First, this bio-inspired functional paper showed excellent superhydrophobic and self-cleaning properties with a high static water contact angle (WCA) of 162.7 ± 0.5° and a low sliding angle (SA) of 5.7 ± 0.6°. Moreover, it possessed unusual repellent properties toward multiple aqueous-based liquids and heat-insulated properties. Second, this paper could be used for writing underwater and maintained satisfactory superhydrophobic performance for a long time with a WCA of 153.3 ± 1.8°. Besides, its high mechanical robustness was also experimentally confirmed in harsh working conditions, such as strong acid/alkali, boiling water, abrasion, bending, and folding. Compared with conventional paper, it is anticipated that this bio-inspired functional paper would be really competitive and demonstrate great potential in the field of underwater and fire-proof applications.

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