Abstract
A large amount of research has been devoted to developing novel superhydrophobic coatings. However, it is still a great challenge to pursuean environmentally friendly method that leads to superhydrophobic coatings. Herein, we demonstrate for the first time, an environmentally friendly method for the preparation of conductive superhydrophobic coatings with sandwich-like structures by using aminoethylaminopropyl polydimethylsiloxane modified waterborne polyurethane (SiWPU) and N-octadecylamine functionalized multi-wall carbon nanotubes. These environmentally friendly coatings with the sheet resistance of 1.1 ± 0.1 kΩ/sq exhibit a high apparent contact angle of 158.1° ± 2° and a low sliding angle below 1°. The influence of the surface texture before and after heat treatment on the wetting properties is discussed. In addition, the coatings can be electrically heated by 3~113 °C with a voltage of 12~72 V, and thus, can be used for deicing. Furthermore, the resulting coatings demonstrate good performance of wear resistance and ultraviolet resistance, which will have broad application potential in harsh environments.
Highlights
IntroductionSurfaces with superhydrophobic properties have attracted extensive interest due to their potential applications, including self-cleaning, anti-icing, anti-bacteria, and anti-adhesion [1,2,3,4,5,6].A variety of techniques, such as the etching method, electrospinning method, chemical vapor deposition method, self-assembly method, sol-gel method, electrodeposition method, hydrothermal method, and phase separation method, have been developed to fabricate superhydrophobic surfaces with different structures [7,8,9,10,11,12,13]
The water contact angle reaches 158.1◦ ± 2◦, and the sliding angle is below 1◦
It was found that the contact angle and the sliding angle show no clear change after 50 h UV exposure, indicating the excellent resistance of the superhydrophobic coating to UV light. It is reported for the first time that an environmentally friendly approach to fabricate conductive superhydrophobic coatings with sandwich-like structures of “SiWPU-multiwalled carbon nanotubes (MWCNTs)-SiWPU” has been completed
Summary
Surfaces with superhydrophobic properties have attracted extensive interest due to their potential applications, including self-cleaning, anti-icing, anti-bacteria, and anti-adhesion [1,2,3,4,5,6].A variety of techniques, such as the etching method, electrospinning method, chemical vapor deposition method, self-assembly method, sol-gel method, electrodeposition method, hydrothermal method, and phase separation method, have been developed to fabricate superhydrophobic surfaces with different structures [7,8,9,10,11,12,13]. In some superhydrophobic surfaces, fluoride-rich materials have been adopted to enhance the hydrophobic effects [17,18]. These less eco-friendly materials contaminate the environment and do harm to the health of producers and users, and increase the treatment cost of the pollutants and the production cost. The theoretical study and preparation methods of superhydrophobic surfaces have made great progress, it is still a great challenge for the researchers to fabricate superhydrophobic surfaces without the use of organic components and fluoride-rich materials. The reported preparation methods of environmentally friendly superhydrophobic surfaces are mainly
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