蜡表面分形结构的形成机制及其超疏水性研究

Formation mechanism of fractal structures on wax surfaces with reference to their super -repellency.

作者信息

Minami Takayuki, Mayama Hiroyuki, Nakamura Shinichiro, Yokojima Satoshi, Shen Jun-Wei, Tsujii Kaoru

机构信息

Nanotechnology Research Center, Research Institute for Electronic Science, Hokkaido University, N-21, W-10, Kita-ku, Sapporo 001-0021, Japan.

Mitsubishi Chemical Group, Science and Technology Research Center, Inc., 1000 Kamoshida-cho, Yokohama 227-8502, Japan and CREST, JST, Japan.

出版信息

Soft Matter. 2007 Dec 11;4(1):140-144. doi: 10.1039/b712938f.

DOI:10.1039/b712938f

PMID:32907093

Abstract

Alkylketene dimer (AKD: a kind of wax) spontaneously forms a fractal structure and its surfaces show super water-repellency (the contact angle = 174°). However, the formation mechanism of the fractal surfaces of AKD is still unclear. In this work, surface structures, wettability and phase behaviors of various waxes have been investigated in order to understand the mechanism for spontaneous formation of super water-repellent fractal surfaces. We have found an empirical general rule without any exceptions at least for the wax samples tested. First, the wax must form a meta-stable crystalline phase when solidified from its melt. Then, the super water-repellent fractal surfaces form spontaneously during the phase transition from a meta-stable to a stable crystalline form. The tempering method also supported the above rule for the waxes showing the fractal structure formation on their surfaces.

摘要

烷基烯酮二聚体（AKD：一种蜡）会自发形成分形结构，其表面具有超疏水性（接触角 = 174°）。然而，AKD分形表面的形成机制仍不清楚。在这项工作中，对各种蜡的表面结构、润湿性和相行为进行了研究，以了解超疏水分形表面自发形成的机制。我们发现了一条经验性的通用规则，至少在所测试的蜡样品中无一例外。首先，蜡从熔体固化时必须形成亚稳晶相。然后，在从亚稳晶相转变为稳定晶相的过程中，超疏水分形表面会自发形成。回火方法也支持了上述关于表面呈现分形结构形成的蜡的规则。