Robust, transparent, superhydrophobic coatings using novel hydrophobic/hydrophilic dual-sized silica particles

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:574

Article

Zhao, Xiaoxiao¹  Park, Daniel S.¹  Choi, Junseo¹  Park, Sunggook¹  Soper, Steven A.^2,3  Murphy, Michael C.¹ 

[1] Louisiana State Univ, Dept Mech & Ind Engn, Ctr BioModular Multiscale Syst Precis Med, Baton Rouge, LA 70803 USA

[2] Univ Kansas, Dept Chem, Lawrence, KS 66045 USA

[3] Univ Kansas, Dept Mech Engn, Lawrence, KS 66045 USA

关键词: Superhydrophobic surfaces;    Polymer;    Transparent;    Epoxy resin;    Silica particles;   

DOI  :  10.1016/j.jcis.2020.04.065

来源: Elsevier

【 摘 要 】

Hypothesis: The superhydrophobic lotus leaf has dual-scale surface structures, that is, nano-bumps on micro-mountains. Large hydrophilic particles, due to its high surface energy and weight, have high affility to substrates and tend to precipitate at the bottom of coating films. Small hydrophobic particles, due to its low surface energy and weight, tends to sit on the top of coating films and form porous structures. To mimic the lotus leaf surface, it may be possible to develop dual-sized particle films, in which small particles are decorated on large particles. Experiments: A one-step spin coating of a mixture of dual-sized silica particles (55/200 nm) was used. Epoxy resin was added to improve the adhesion of particle films. The single-sized and dual-sized particle films were compared. The mechanical robustness of particle films was tested by tape peeling and droplet impact. Findings: The novel combination of hydrophobic silica (55 nm) and hydrophilic silica (200 nm) is essential in creating the hierarchical structures. By combining the strong adhesion of hydrophilic silica (bottom of coating film) to polymer substrates and porous structures of hydrophobic silica (top of coating film), we first time report a one-step and versatile approach to create uniform, transparent, robust, and superhydrophobic surface. Crown Copyright (C) 2020 Published by Elsevier Inc. All rights reserved.

【 授权许可】

Free