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Published on: December 15, 2015
Capillary wrinkling of floating thin polymer films
Jiangshui Huang1, Megan Juszkiewicz, Wim H de Jeu
1Department of Physics, University of Massachusetts, Amherst, MA 31003, USA.
Science (New York, N.Y.)
|August 4, 2007
Summary
Ultrathin polymer films wrinkle when exposed to water. This study develops a simple method using wrinkling patterns to measure film elasticity and thickness, aiding material science research.
Area of Science:
- Materials Science
- Polymer Physics
- Surface Science
Background:
- Freely floating polymer films, tens of nanometers thick, exhibit wrinkling instability when subjected to capillary forces from liquid drops.
- Wrinkling patterns are characterized by the number and length of wrinkles, offering insights into material properties.
Purpose of the Study:
- To develop a metrology for measuring the elasticity and thickness of ultrathin polymer films.
- To validate theoretical predictions regarding wrinkling instability and pattern selection.
- To establish a method for studying the viscoelastic response of thin films.
Main Methods:
- Inducing capillary force-induced wrinkling on ultrathin polymer films using a water droplet.
- Analyzing wrinkling patterns by quantifying the number and length of wrinkles.
- Combining scaling relations for wrinkle length and number to create a metrology.
Main Results:
- The number of wrinkles directly correlates with the film's elastic properties and the applied capillary force.
- The study confirms theoretical predictions for pattern selection and well-defined length scales in wrinkling.
- A validated metrology was established for measuring ultrathin film elasticity and thickness.
Conclusions:
- Wrinkling patterns in ultrathin polymer films provide a reliable basis for metrology.
- The developed method offers a simple, low-cost approach to characterize thin film properties.
- Film relaxation dynamics reveal insights into the viscoelastic behavior of ultrathin materials.
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