Wetting morphologies at microstructured surfaces

被引:326
|
作者
Seemann, R
Brinkmann, M
Kramer, EJ
Lange, FF
Lipowsky, R [1 ]
机构
[1] Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany
[2] Univ Calif Santa Barbara, Mitsubishi Chem Ctr Adv Mat, Santa Barbara, CA 93106 USA
关键词
surface topography; wetting phenomena; microfluidics;
D O I
10.1073/pnas.0407721102
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The wetting of microstructured surfaces is studied both experimentally and theoretically. Even relatively simple surface topographies such as grooves with rectangular cross section exhibit a large variety of different wetting morphologies as observed by atomic force microscopy. This polymorphism arises from liquid wedge formation along the groove corners and from contact line pinning along the groove edges. A global morphology diagram is derived that depends only on two system parameters: (i) the aspect ratio of the groove geometry and (it) The contact angle of the underlying substrate material. For microfluidics, the most interesting shape regimes involve extended liquid filaments, which can grow and shrink in length while their cross section stays essentially constant. Thus, any method by which one can vary the contact angle can be used to switch the length of the filament, as is demonstrated in the context of electrowetting.
引用
收藏
页码:1848 / 1852
页数:5
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