Fabrication And Properties Of Super-hydrophobic And Hierarchical Structure Coatings

Inspired by the super-hydrophobic phenomenon in the nature, a series of synthesis techniques, based on the bionics, were explored to prepare various materials featured by super-hydrophobic surface. In addition, detailed structure characterization and the relevant performance tests were also performed.Super-hydrophobic coatings, characteristic of Lotus-resembled surface morphology, were prepared usingγ?aminopropyltriethoxylsilane (KH550) as a linker, the self-assembly of silanol group hydrolyzed from siloxane, the mixture of the nano-fibers derived from the sintered PTFE and the micro-particles achieved by the aggregation of siloxane. The static contact angle approached 152°, and the roll angle approximated to 5°. SEM showed its secondary structure for as-made coatings.Contact angle tests were undertaken to investigate the relationship between surface microscopic strutcute and hydrophobic performance of the coatings. EIS was utilized to analyze the corrosion behavior of samples covered by coatings under simulated corrosion conditions. The results showed that the corrosion current of samples was decreased by 3-4 orders of magnitude than mere stainless steel, signifying an excellent corrosion protective performance. Ordered mesoporous carbon film was prepared on the stainless steel substrate using soluble phenolic resins as carbon precursor and F127 as template-directing agent. The following micro-nano composite structure was constructed using carbon film as substrate together with the as-synthesized glucose carbon spheres and activated dispersion-treated carbon nanotubes as filler via homogenous and non-homogenous methods. SEM technology was employed to characterize the surface strucute and chemical components of as-made superhydrophobic materials. And the corrosion protective performance was conducted under the corrosion conditons. The composite coating, using carbon nanotubes as filler, exhibited carbon nanotubes arrayed structure upright to the surface. Wherein the contact angle reached as high as 165°, suggesting much more excellent protective performance compared with non-superhydrophobic coatings.