Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 13, Pages 10014-10021Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am405884x
Keywords
superhydrophobicity; transparency; organic-inorganic hybrid; solidification-induced phase separation; Wenzel-Cassie transition
Funding
- National Natural Science Foundation of China [51273205]
- Ministry of Science and Technology of China [2010CB934705, 2012CB933200]
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Highly transparent and durable superhydrophobic hybrid nanoporous coatings with different surface roughnesses were fabricated via a simple solidification-induced phase-separation method using a liquid polysiloxane (PSO) containing SiH and SiCH=CH2 groups as precursors and methyl-terminated poly(dimethylsiloxane)s (PDMS) as porogens. Owing to the existence of SiCHn units, the hybrid material is intrinsically hydrophobic without modification with expensive fluorinated reagents. The roughness of the coating can be easily controlled at the nanometer scale by changing the viscosity of PDMS to achieve both superhydrophobicity and high transparency. The influence of surface roughness on the transparency and hydrophobicity of the coatings was investigated. The enhancement from hydrophobic to superhydrophobic with increasing surface roughness can be explained by the transition from the Wenzel state to the Cassie state. The optimum performance coating has an average transmittance higher than 85% in the visible-light range (400-780 nm), a water contact angle of 155 degrees, and a slide angle lower than 1 degrees. The coatings also exhibit good thermal and mechanical stability and durable superhydrophobicity, which paves the way for real applications of highly transparent superhydrophobic coatings.
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