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Manipulation of Wetting Directions Using Nanostructures with Asymmetric Surface Energies

Published online by Cambridge University Press:  20 February 2014

Changquan Lai ,
Carl V. Thompson  and
W.K. Choi
Changquan Lai
Affiliation:
Singapore MIT Alliance, National University of Singapore, Singapore 117576, Singapore.
Carl V. Thompson
Affiliation:
Singapore MIT Alliance, National University of Singapore, Singapore 117576, Singapore. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
W.K. Choi
Affiliation:
Singapore MIT Alliance, National University of Singapore, Singapore 117576, Singapore. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore.
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Abstract

Ordered arrays of polymeric nanostructures with different shapes were generated using laser interference lithography and plasma etching. Surface energy anisotropy was produced in each nanostructure in the array through oblique angle deposition of a hydrophilic metal. When a water droplet was placed on such a surface, it was found to wet preferentially in the direction of the hydrophilic face. Depending on the shape of the nanostructure and the deposition direction, wetting can be made uni-, bi- or tri-directional. Insights obtained in this study contribute to the understanding of wetting on rough, chemically heterogeneous surfaces and provide new methods to engineer functional surfaces for the control of wetting directions.

Keywords

fluidicspolymernanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1648: Symposium HH – Functional Surfaces/Interfaces for Controlling Wetting and Adhesion , 2014 , mrsf13-1648-hh03-04
Copyright
Copyright © Materials Research Society 2014 

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References

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