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Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices

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Published on: April 1, 2016

Elastocapillary Crease.

Qihan Liu¹, Tetsu Ouchi², Lihua Jin³

¹John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters

|April 2, 2019

Summary

This summary is machine-generated.

Soft materials form creases under compression due to elasticity and capillarity. This study models crease nucleation, finding it depends on surface defects and strain range, with vanishing surface tension upon contact significantly impacting the process.

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Area of Science:

Soft matter physics
Materials science
Mechanics of materials

Background:

Compressing soft, elastic materials can lead to the formation of creases.
Crease nucleation in these materials is governed by a interplay between elasticity and surface tension (capillarity).

Purpose of the Study:

To introduce and analyze a new model for elastocapillary crease nucleation.
To investigate the influence of surface tension changes upon self-contact on crease formation.

Main Methods:

Development of a theoretical model for elastocapillary creases.
Incorporation of surface tension variations, specifically vanishing upon self-contact.
Analysis of the model's predictions regarding defect size and strain ranges.

Main Results:

Crease nucleation is dependent on surface defect size relative to the elastocapillary length.
Nucleation occurs over a defined range of strains, not at a single critical strain.
Loss of surface tension upon self-contact reduces nucleation energy barriers and broadens the nucleation strain range.

Conclusions:

The elastocapillary model provides a framework for understanding crease nucleation in soft materials.
Surface tension dynamics, particularly its loss upon contact, are critical factors influencing crease formation.
The model's predictions are validated through experimental data and literature review.