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Shape of a liquid front upon dewetting.

R Seemann¹, S Herminghaus, K Jacobs

¹Department of Applied Physics, University of Ulm, D-89069 Ulm, Germany.

Physical Review Letters

|November 3, 2001

Summary

Polymer film dewetting creates a rim structure. Unlike simple liquids, non-Newtonian fluids exhibit viscoelastic effects, altering rim profiles and offering insights into nanoscale fluid properties.

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Area of Science:

Materials Science
Fluid Dynamics
Surface Science

Background:

Dewetting of polymer films on solid substrates is a critical phenomenon in materials science.
The rim structure formed at the contact line during dewetting is theoretically predicted to exhibit damped harmonic oscillations.
Experimental investigation of this phenomenon is crucial for understanding complex fluid behavior.

Purpose of the Study:

To experimentally investigate the profile of the liquid front during polymer film dewetting.
To compare the behavior of non-Newtonian liquids with theoretical predictions for simple systems.
To explore the potential of rim profile analysis for studying rheological properties of complex fluids.

Main Methods:

Utilizing atomic force microscopy (AFM) to examine the liquid front profile.
Analyzing the accumulated material in the rim adjacent to the three-phase contact line.
Comparing experimental observations with theoretical models of damped harmonic oscillations.

Main Results:

The study experimentally confirms the formation of a rim structure during polymer film dewetting.
Non-Newtonian liquids show qualitatively different rim profiles compared to theoretical predictions for Newtonian fluids, attributed to viscoelastic effects.
The observed rim shapes provide a basis for quantitative analysis of fluid rheology.

Conclusions:

The rheological properties of complex fluids can be quantitatively studied at the nanometer scale by analyzing dewetting rim shapes.
Viscoelastic effects significantly influence the dewetting process and rim morphology of non-Newtonian polymer films.
This research bridges theoretical predictions with experimental observations in polymer dewetting.

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