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Scalable Stamp Printing and Fabrication of Hemiwicking Surfaces

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Spontaneous wettability patterning via creasing instability.

Dayong Chen¹, Gareth H McKinley², Robert E Cohen³

¹Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.

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

|July 7, 2016

Summary

This summary is machine-generated.

Researchers developed a simple dip-coating method to create patterned wettability surfaces on elastomers. This technique allows for spontaneous pattern generation on both flat and curved surfaces, offering a scalable alternative to traditional microfabrication for applications like heat transfer and water collection.

Keywords:

creasing instability curved surfaces domain size morphology wettability contrast

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Area of Science:

Materials Science
Surface Science
Polymer Science

Background:

Patterned wettability surfaces are crucial for industrial applications including heat transfer, water collection, and particle separation.
Conventional fabrication methods like microfabrication have limitations in scalability and applicability to curved substrates.

Purpose of the Study:

To develop a scalable and versatile method for creating wettability patterns on both flat and curved surfaces.
To explore the use of mechanical instability in polyurethane elastomer films for spontaneous pattern generation.

Main Methods:

Utilizing a mechanical instability inherent in polyurethane elastomer films.
Employing a simple dip coating process for surface fabrication.
Controlling pattern characteristics through variations in dipping time, sample prestress, and chemical treatment.

Main Results:

Successfully generated spontaneous wettability patterns on polyurethane elastomer surfaces.
Achieved independent control over domain size (100–500 μm), morphology, and wettability contrast.
Demonstrated applicability to both flat and curved surfaces.

Conclusions:

The dip coating method offers a facile and scalable approach to fabricating patterned wettability surfaces.
This technique overcomes limitations of traditional microfabrication, enabling applications on complex geometries.
The ability to tune pattern characteristics provides flexibility for diverse industrial needs.