Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 11, Issue 6, Pages 5083-5088Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2011.4151
Keywords
Superhydrophobic; Hierarchical; Polyaniline; Water-Adhesion
Categories
Funding
- Program of Introducing Talents of Discipline to Universities [B06006]
- National Natural Science Foundation of China [20836006]
- Advanced Materials Ltd., Co. (Tianjin)
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Wettability and water-adhesion behavior are the most important properties of solid surfaces from both fundamental and practical aspects. Here, the biomimetic superhydrophobic surface was fabricated via a simple coating process using polyaniline (PANI) microspheres which is covered with PANI nanowires as functional component, and poly-vinyl butyral (PVB, poly-vinyl alcohol crosslinked with n-butylaldehyde) as PANI microsphere adhering improvement agent to the substrate. The obtained surface displays superhydrophobic behavior without any modification with low-surface-energy materials such as thiol- or fluoroalkylsilane. The effects of coating process and the content of PANI microspheres on superhydropbobic behavior were discussed. Combine contact angle, water-adhesion measurements, scanning electronic microscopy (SEM) observations with selected areas energy dispersion spectrometer (EDS), the hydrophobic mechanism was proposed. The superhydrophobicity is attributed to a hierarchical morphology of PANI microspheres and the nature of the material itself. In addition, induced by van der Waals forces, the created superhydrophobic surface here shows the strong water-adhesion behavior. The surface has the combination performance of Lotus leaf and gecko's pad. The special wettability would be of great significance to the liquid micro-transport in microfluid devices. The experimental results show that the ordinary coating process is a facile approach for fabrication of superhydrophobic surfaces.
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