Control of dynamic behavior of water by understanding relationship between structure of adsorbed water and wettability behavior of water

2019 Fiscal Year Final Research Report

• Project/Area Number: 16H02400
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Shibaura Institute of Technology
• Principal Investigator: Takahiro Ishizaki 芝浦工業大学, 工学部, 教授 (50397486)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Keywords: 表面・界面物性 / 表面濡れ性 / 接触角ヒステリシス / 有機単分子膜 / 共吸着

Outline of Final Research Achievements

In this study, the wettability and adhesive force of adsorbed water for hydrophobic surfaces and the mixed surfaces composed of hydrophobicity and hydrophilicity were investigated. It was revealed that low hysteresis surfaces were successfully formed by covering two types of organic silane molecules having different alkyl chain length. Contact angle measurements using some types of liquids having different surface tension revealed that the surface area of molecular defects and pore sizes were less than 0.31 to 0.36 nm2.
Force curve measurements for hydrophobic surfaces and the mixed surfaces composed of hydrophobicity and hydrophilicity confirmed that the adhesive forces of adsorbed water corresponded to the magnitude relation between static water contact angle values.

Free Research Field

表面工学

Academic Significance and Societal Importance of the Research Achievements

本課題を通し，従来の熱力学的・速度論的観点から得られる表面の物理化学的特性および水の動的挙動と吸着水の構造との関係を体系化させることができたと考えられる。また、接触角ヒステリシスの低い表面を形成させるためには、分子密度の制御が重要であることを明らかにした。これらの点に学術的意義がある。水の動的挙動（濡れ性）を制御可能な表面処理技術は，材料表面からの液滴の除去効率を大幅に改善できるため，バイオチップ，電子，自動車，半導体産業等に対し，省エネの観点から幅広い産業への波及効果が期待できる。