Robust and thermal-healing superhydrophobic surfaces by spin-coating of polydimethylsiloxane

Robust superhydrophobic surfaces fabricated by spin-coating polydimethylsiloxane on hierarchical aluminum substrates are thermal-healing after pollution and abrasion. [Display omitted] Superhydrophobic surfaces easily lose their excellent water-repellency after damages, which limit their broad appli...

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Bibliographic Details
Published in:Journal of colloid and interface science 2017-12, Vol.508, p.18-27
Main Authors: Long, Mengying, Peng, Shan, Deng, Wanshun, Yang, Xiaojun, Miao, Kai, Wen, Ni, Miao, Xinrui, Deng, Wenli
Format: Article
Language:English
Subjects:
Healing
Hierarchical
PDMS
Robust
Superhydrophobic
Thermal
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Summary:Robust superhydrophobic surfaces fabricated by spin-coating polydimethylsiloxane on hierarchical aluminum substrates are thermal-healing after pollution and abrasion. [Display omitted] Superhydrophobic surfaces easily lose their excellent water-repellency after damages, which limit their broad applications in practice. Thus, the fabrication of superhydrophobic surfaces with excellent durability and thermal healing should be taken into consideration. In this work, robust superhydrophobic surfaces with thermal healing were successfully fabricated by spin-coating method. To achieve superhydrophobicity, cost-less and fluoride-free polydimethylsiloxane (PDMS) was spin-coated on rough aluminum substrates. After being spin-coated for one cycle, the superhydrophobic PDMS coated hierarchical aluminum (PDMS-H-Al) surfaces showed excellent tolerance to various chemical and mechanical damages in lab, and outdoor damages for 90days. When the PDMS-H-Al surfaces underwent severe damages such as oil contamination (peanut oil with high boiling point) or sandpaper abrasion (500g of force for 60cm), their superhydrophobicity would lose. Interestingly, through a heating process, cyclic oligomers generating from the partially decomposed PDMS acted as low-surface-energy substance on the damaged rough surfaces, leading to the recovery of superhydrophobicity. The relationship between the spin-coating cycles and surface wettability was also investigated. This paper provides a facile, fluoride-free and efficient method to fabricate superhydrophobic surfaces with thermal healing.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2017.08.027