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Related Experiment Video

Updated: May 9, 2026

A Microfluidic Technique to Probe Cell Deformability

A Microfluidic Technique to Probe Cell Deformability

Published on: September 3, 2014

Capillary deformations of bendable films.

R D Schroll¹, M Adda-Bedia, E Cerda

¹Physics Department, University of Massachusetts, Amherst, Massachusetts 01003, USA.

Physical Review Letters

|July 19, 2013

Summary

We found that liquid drops on ultrathin, bendable solid sheets exhibit a modified contact angle due to elastocapillary effects. Wrinkle pattern size is predictable, enabling precise measurements of thin films.

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Area of Science:

Physics
Materials Science
Surface Science

Background:

Classical theories describe liquid drop contact angles on solid surfaces.
Ultrathin solid sheets on deformable foundations present unique wetting behaviors.

Purpose of the Study:

To investigate the partial wetting of liquid drops on ultrathin solid sheets.
To understand the elastocapillary phenomena governing liquid-solid-vapor interactions on highly bendable sheets.
To develop a predictable model for wrinkle patterns in such systems.

Main Methods:

Theoretical calculations based on membrane theory.
Experimental validation of theoretical predictions.
Analysis of liquid-solid-vapor contact angle modification.

Main Results:

The liquid-solid-vapor contact angle deviates from the Young angle due to sheet bendability, not material softness.
A new elastocapillary phenomenon driven by high bendability was identified.
The size of emergent wrinkle patterns is fully predictable.

Conclusions:

High bendability of ultrathin sheets introduces a novel elastocapillary effect impacting wetting.
Predictable wrinkle patterns allow for quantitative, calibration-free metrology of ultrathin films.
This work revises classical wetting theories for highly deformable thin films.