Facile fabrication of fluorine-free, transparent and self-cleaning superhydrophobic coatings based on biopolymer castor oil

•A hydrophobic PUA was prepared in which castor oil accounts for more than 56% wt.•A transparent superhydrophobic surface was constructed by using PUA and fused SiO2.•The coating showed high transmittance above 80% in visible-light region.•The WCA of the as-prepared coating can reach 158.5°. A highl...

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Bibliographic Details
Published inMaterials letters Vol. 230; pp. 84 - 87
Main Authors Wang, Qing, Chen, Guangxue, Tian, Junfei, Yu, Zhaohui, Deng, Qianjun, Yu, Mingguang
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.11.2018
Elsevier BV
Subjects
Abrasion
Abrasives
Biopolymers
Castor oil
Cleaning
Coatings
Contact angle
Contaminants
Fluorine
Hydrophobic surfaces
Hydrophobicity
Materials science
Microstructure
Nanoparticles
Oil
Optoelectronics
Polymer matrix composites
Polymeric composites
Polyurethane resins
Self-cleaning
Silicon dioxide
Superhydrophobic coating
Transparent
Polymeric composites
Self-cleaning
Transparent
Microstructure
Superhydrophobic coating
Castor oil
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Summary:•A hydrophobic PUA was prepared in which castor oil accounts for more than 56% wt.•A transparent superhydrophobic surface was constructed by using PUA and fused SiO2.•The coating showed high transmittance above 80% in visible-light region.•The WCA of the as-prepared coating can reach 158.5°. A highly transparent self-cleaning superhydrophobic surface was constructed via a facile and environmentally friendly strategy by using biomass-based polyurethane and fused SiO2 nanoparticles. By simply controlling the amounts of castor oil (CO) and SiO2, the coating presented excellent superhydrophobic with high water contact angle (158.5°) and low sliding angle (3.9°), as well as the transmittance of the coating was above 80% in visible-light region. Moreover, the coatings showed remarkable robustness against abrasion of 5 cycles without an apparent decrease of superhydrophobicity and possessed excellent self-cleaning properties against dirty contaminant. Therefore, such transparent and self-cleaning superhydrophobic coating could make it an ideal material for application in optoelectronics, liquid-repellent coatings, and oil-water separation.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.07.090