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

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タイトル: Formation mechanism of super water-repellent fractal surfaces of alkylketene dimer
著者: Fang, Wenjun 著作を一覧する
Mayama, Hiroyuki 著作を一覧する
Tsujii, Kaoru 著作を一覧する
キーワード: Super water-repellency
Fractal surface structures
Alkylketene dimer
phase transition
発行日: 2008年 3月 5日
出版者: Elsevier B.V.
誌名: Colloids and Surfaces A : Physicochemical and Engineering Aspects
巻: 316
号: 1-3
開始ページ: 258
終了ページ: 265
出版社 DOI: 10.1016/j.colsurfa.2007.09.010
抄録: 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 (URI):
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 辻井 薫


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