The Effect of Patterned Micro-Structure on the Apparent Contact Angle and Three-Dimensional Contact Line

The measurement of the apparent contact angle on structured surfaces is much more difficult to obtain than on smooth surfaces because the pinning of liquid to the roughness has a tremendous influence on the three phase contact line. The results presented here clearly show an apparent contact angle v...

Full description

Saved in:

Bibliographic Details
Published in:	Fluids (Basel) 2021-02, Vol.6 (2), p.92
Main Authors:	Foltyn, Patrick, Restle, Ferdinand, Wissmann, Markus, Hengsbach, Stefan, Weigand, Bernhard
Format:	Article
Language:	eng
Subjects:	apparent contact angle hot embossing laser lithography micro-structured surface nickel electroforming three-dimensional evaluation
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	The measurement of the apparent contact angle on structured surfaces is much more difficult to obtain than on smooth surfaces because the pinning of liquid to the roughness has a tremendous influence on the three phase contact line. The results presented here clearly show an apparent contact angle variation along the three phase contact line. Accordingly, not only one value for the apparent contact angle can be provided, but a contact angle distribution or an interval has to be given to characterize the wetting behavior. For measuring the apparent contact angle distribution on regularly structured surfaces, namely micrometric pillars and grooves, an experimental approach is presented and the results are provided. A short introduction into the manufacturing process of such structured surfaces, which is a combination of Direct LASER Writing (DLW) lithography, electroforming and hot embossing shows the high quality standard of the used surfaces.
ISSN:	2311-5521 2311-5521