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Formation mechanism of super water-repellent fractal surfaces of alkylketene dimer
| Title: | Formation mechanism of super water-repellent fractal surfaces of alkylketene dimer |
| Authors: | Fang, Wenjun Browse this author | | Mayama, Hiroyuki Browse this author →KAKEN DB | | Tsujii, Kaoru Browse this author |
| Keywords: | Super water-repellency | | Fractal surface structures | | Alkylketene dimer | | phase transition |
| Issue Date: | 5-Mar-2008 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Colloids and Surfaces A : Physicochemical and Engineering Aspects |
| Volume: | 316 |
| Issue: | 1-3 |
| Start Page: | 258 |
| End Page: | 265 |
| Publisher DOI: | 10.1016/j.colsurfa.2007.09.010 |
| Abstract: | Alkylketene dimer (AKD), a kind of wax, has been known to form fractal surfaces spontaneously, and to show super water-repellent property. In order to understand further the super water-repellency of the AKD surfaces and to elucidate the mechanism of spontaneous formation of the fractal structures on the wax surfaces, a pure and a mixed AKD samples were employed to make the surfaces by the melt-solidification method. Time-dependent contact angles of water droplets on the AKD surfaces cured at several temperatures were systematically measured. It was found that spontaneous formation of super water-repellent surfaces was thermally induced quite effectively. For example, it took about 6 days for the pure AKD surface to show the super water-repellency at 40 oC but did just 1 hour at 50 oC. The fractal dimension of the mixed AKD surface with super water-repellency was calculated to be 2.26 from the SEM images by the box-counting method which should be reasonably compared with 2.29 of pure AKD surface. The mechanism for the spontaneous formation of fractal structures was discussed from the results of the time-dependent contact angles, differential scanning calorimetric (DSC) curves and X-ray diffractometric (XRD) patterns. It has been made clear that the fractal AKD surface and its super water-repellency result from the phase transformation from the metastable state to the stable one of the AKD crystals. |
| Relation: | http://www.sciencedirect.com/science/journal/09277757 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/32660 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 辻井 薫
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