Nanoscale Contact Line Pinning Boosted by Ångström-Scale Surface Heterogeneity

DOI 機関リポジトリ (HANDLE) Web Site PubMed 参考文献40件 オープンアクセス
  • 平間, 裕大
    九州大学大学院工学研究院航空宇宙工学部門
  • 手嶋, 秀彰
    九州大学大学院工学研究院航空宇宙工学部門 九州大学カーボンニュートラル・エネルギー国際研究所
  • 髙橋, 厚史
    九州大学大学院工学研究院航空宇宙工学部門 九州大学カーボンニュートラル・エネルギー国際研究所

この論文をさがす

説明

The pinning effect plays an important role in many fluidic systems but remains poorly understood, especially at the nanoscale. In this study, we measured the contact angles of glycerol nanodroplets on three different substrates using atomic force microscopy. By comparing the shapes of the three-dimensional images of droplets, we found that a possible origin of the long-discussed deviation of the contact angles of nanodroplets from the macroscopic value is the pinning force induced by ångström-scale surface heterogeneity. It was also revealed that the pinning forces acting on glycerol nanodroplets on a silicon dioxide surface are up to twice as large as those acting on macroscale droplets. On a substrate where the effect of pinning was strong, an unexpected irreversible change from an irregularly shaped droplet to an atomically flat liquid film occurred. This was explained by the transition of the dominant force from liquid/gas interfacial tension to an adsorption force.

収録刊行物

参考文献 (40)*注記

もっと見る

関連プロジェクト

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ