Superhydrophobic surface fabricated by spraying hydrophobic R974 nanoparticles and the drag reduction in water
| Autor: | Zhanhu Guo, Xiaohu Zhao, Jiang Guo, Zhigang Shen, Chujiang Cai, Nannan Sang, Teng Sicong |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Scanning electron microscope Nanoparticle 02 engineering and technology Surfaces and Interfaces General Chemistry Epoxy engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Superhydrophobic coating 0104 chemical sciences Surfaces Coatings and Films Contact angle Coating visual_art Materials Chemistry visual_art.visual_art_medium engineering Composite material 0210 nano-technology Porosity Layer (electronics) |
| Zdroj: | Surface and Coatings Technology. 307:366-373 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2016.09.009 |
| Popis: | Based on the phenomena of the embedding dusts on the surface of fresh paint film, industrialized hydrophobic R974 nanoparticles were used as “dust”, and epoxy resin was used as “paint” to prepare the superhydrophobic film with high bonding strength. The superhydrophobic film was fabricated by spraying the R974-ethanol suspension onto the dip-coated epoxy resin film on glass slide. Because the epoxy resin acted as bonding layer between the R974 nanoparticles film and the glass slide, a combination of high bonding strength and superhydrophobicity was achieved. The superhydrophobic surface was characterized by water contact angle measurements and scanning electron microscopy (SEM). The water contact angle of the R974 coating could reach 154.7°, and the significant differences in the surface morphology of superhydrophobic coating were presented with different R974 concentrations. A flat, fractal-like texture was observed for coatings sprayed with low R974 concentration, and a rough, porous surface for coatings sprayed with high R974 concentration. The adhesion between the R974 coating and epoxy resin was evaluated by the adhesive-tape test. The interaction between fractal-like aggregated R974 with epoxy resin was large enough because of the surface-to-surface contact mode, and the interaction between microparticles of aggregated R974 with the epoxy resin was weak because of the point-to-surface contact mode. By comparing the skin friction drag on normal surface with the prepared superhydrophobic surface, the superhydrophobic coatings achieved a 12% drag reduction in water. |
| Databáze: | OpenAIRE |
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