20304 ぬれ性パターン上における液体の挙動と微粒子整列への応用(OS14 機能性マイクロデバイスの創製・評価)

概要

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A wettability-pattern, array of hydrophobic and hydrophilic regions, is formed on Si substrate. The shape and sliding angle of water drop were experimentally investigated for some types of stripe wettability-patterns. At the both edge of water drop on the stripe wettability-pattern, headland-like water films are formed on the hydrophilic regions. The radius of the water film becomes larger as line width and number of hydrophilic region under water drop are increased. The sliding angle also changes with design of wettability-pattern and falls with rise of the ratio of hydrophilic width to hydrophobic width. Then, the wettability-patterned substrates were fished up from a suspension containing polystyrene micro spheres. The micro spheres were self-aligned on the hydrophilic regions to be hexagonally packed into monolayer after forming a quasi-aligned state along the edge of headland-like water films. A width of aligned spheres changes with both hydrophilic and hydrophobic widths, so that it seems to be affected by three-dimensional shape of water films like a practical contact angle.
社団法人日本機械学会の論文
2005-03-17