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Formation mechanism of super water-repellent fractal surfaces of alkylketene dimer

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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.
Type: article (author version)
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)

Submitter: 辻井 薫

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