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Related Experiment Video

Updated: Jun 30, 2026

Fabrication of Large-area Free-standing Ultrathin Polymer Films

Fabrication of Large-area Free-standing Ultrathin Polymer Films

Published on: June 3, 2015

Capillarity-induced fold localization in film-substrate systems.

So Nagashima¹, Rikuto Ota¹, Seishiro Matsubara¹

¹Department of Mechanical Systems Engineering, Nagoya University, Nagoya 464-8603, Japan.

Interface Focus

|May 19, 2025

Summary

Surface instability and elastocapillarity drive fold localization in thin films. High-aspect-ratio wrinkles enable channel formation, with reversible control via strain adjustment for novel applications.

Keywords:

elastocapillarity fold surface instability thin film water droplet wrinkle

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Area of Science:

Mechanics of Materials
Surface Science
Biophysics

Background:

Surface instability and elastocapillarity are fundamental in biological and engineered systems.
Understanding fold localization is key to controlling surface morphology.

Purpose of the Study:

Investigate capillarity-induced fold localization in film-substrate systems.
Analyze the influence of wrinkle aspect ratio on fold morphology.
Explore reversible control of morphological transitions.

Main Methods:

Experimental investigation of film-substrate systems.
Finite element simulations for mechanical analysis.
Water droplet deposition to induce surface changes.

Main Results:

Globally ordered wrinkles transform into localized folds upon water droplet deposition.
Fold morphology and dimensions are dictated by initial wrinkle aspect ratio.
High-aspect-ratio wrinkles promote spontaneous formation of subsurface channels.
Morphological transitions between wrinkles and folds are reversible with strain adjustment.

Conclusions:

Established a framework for understanding surface instability and elastocapillarity.
Demonstrated the role of wrinkle geometry in fold localization and channel formation.
Provided design principles for functional surfaces and devices, including fold nanochannels and graphene oxide folding.