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Wetting morphologies at microstructured surfaces.

Abstract：

: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 (ii) 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.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Seemann R,Brinkmann M,Kramer EJ,Lange FF,Lipowsky R

doi

10.1073/pnas.0407721102

keywords:

subject

Has Abstract

pub_date

2005-02-08 00:00:00

pages

1848-52

issue

6

eissn

0027-8424

issn

1091-6490

pii

0407721102

journal_volume

102

pub_type

杂志文章

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