期刊
MATERIALS & DESIGN
卷 86, 期 -, 页码 338-346出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.07.092
关键词
Superhydrophobic; Polyurethane; Carbon nanotubes; Roughness; Surface energy
资金
- Iranian Nanotechnology Initiative
A single-step method, including surface embedding of nanopartides into a polymer matrix, was employed to fabricate superhydrophobic thermoplastic polyurethane (TPU)/carbon nanotube (CNT) nanocomposite coatings. The main aim was to prove that surface roughness plays a more important role in designing superhydrophobic surfaces as compared with the surface energy, Therefore, TPU was used as the model hydrophilic polymer and CNTs were employed as non-hydrophobic nanopartides. It was found that, at a certain pressing time, CNTs form an efficient hair-like morphology which is able to highly enclose air within its as-formed pores leading to superhydrophobic behavior. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and confocal microscopy were utilized for characterization of samples. SEM and confocal microscopy results proved that surface roughness played the key role in the final wettability behavior. Based on XPS results, it was also found that a very long pressing time led to partial migration of TPU macromolecules into the CNTs' pores, and hence, superhydrophobicity was reduced. The effects of mechanical abrasion and nanoparticle type on wettability behavior of samples were evaluated as well. In conclusion, it is suggested that surface roughness factor should be highly considered in designing superhydrophobic nanocomposite coatings rather than surface energy. (C) 2015 Elsevier Ltd. All rights reserved.
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