Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, PR China.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Carbohydr Polym. 2022 Aug 15;290:119504. doi: 10.1016/j.carbpol.2022.119504. Epub 2022 Apr 20.
It is challenging to build a superhydrophobic coating with aqueous dispersions since hydrophobic substances are usually dispersed in pure organic or water/organic mixed solvents. In this study, hydrophobic SiO nanoparticles were dispersed in water assisted with cellulose nanofiber (CNF) and the superhydrophobic surface was manufactured by coating a waterborne dispersion composed of CNF, hydrophobic SiO nanoparticles and methyltrimethoxysilane (MTMS). It was found that the dispersion of SiO in water can be improved by CNF. Meanwhile, the coated paper surface retained its hydrophobicity after 10 abrasion cycles due to the adhesion of the coating surface promoted by MTMS. When SiO content over 0.25 wt%, the coated paper surface displayed a superhydrophobic property, and the moisture absorption decreased to 31-34%. The contact angle of the coating surface was 162°, the contact angle hysteresis was 1.96° and the rolling contact angle was 1.33° when SiO content was 1 wt%.
制备水性分散体的超疏水涂层具有挑战性，因为疏水性物质通常分散在纯有机溶剂或水/有机溶剂混合溶剂中。在这项研究中，疏水的 SiO2 纳米粒子在纤维素纳米纤维（CNF）的辅助下分散在水中，并且通过涂覆由 CNF、疏水 SiO2 纳米粒子和甲基三甲氧基硅烷（MTMS）组成的水性分散体来制造超疏水表面。结果发现，CNF 可以改善 SiO2 在水中的分散性。同时，由于 MTMS 促进了涂层表面的附着，经过 10 次磨损循环后，涂覆的纸张表面仍保持疏水性。当 SiO2 含量超过 0.25wt%时，涂层表面呈现出超疏水性，吸湿性降低至 31-34%。当 SiO2 含量为 1wt%时，涂层表面的接触角为 162°，接触角滞后为 1.96°，滚动接触角为 1.33°。
