321 超撥水性壁面における水接触角の理論解析(T02-2 マイクロナノメカトロニクス(2),大会テーマセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In nature, many surfaces having micro scale roughness are superhydrophobic and self-cleaning. Some of them like lotus leaf have double (micro- and nano-) scale roughness, but the effectiveness of double roughness is not clear. In addition, although many previous studies reported the methods to make such surfaces with high contact angle, none of them could be a guide to achieve superhydrophobicity and those of thermodynamic mechanisms are not well understood. In this study, three types of 3-D model pillar textured surfaces, cavity surfaces and double roughened surfaces- are chosen and thermodynamically analysed focusing on the surface free energy. By calculations, equilibrium CA, Free Energy Wall (FEW) and CA hysteresis are obtained. Based on these calculations, the factor of the determination of sliding angle is indicated. Additionally, based on these results, one of the optimal geometries for superhydrophobic surfaces are suggested.
2008-08-02