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Related Experiment Video

Updated: Jun 9, 2026

Quantitative Analysis of Cell Edge Dynamics during Cell Spreading

Quantitative Analysis of Cell Edge Dynamics during Cell Spreading

Published on: May 22, 2021

Spreading and retraction as a function of drop size.

Moniraj Ghosh¹, Kathleen J Stebe

¹Johns Hopkins University, Baltimore, MD, USA.

Advances in Colloid and Interface Science

|September 7, 2010

Summary

Simulating drop dynamics on thin films reveals that small drops are influenced by disjoining pressure, while larger drops follow Tanner's law, with thin film effects crucial for accurate retraction modeling.

Area of Science:

Fluid dynamics
Surface science
Nanotechnology

Background:

Understanding drop behavior on thin films is crucial for applications in coatings, microfluidics, and material science.
Existing models often simplify thin film dynamics or neglect their influence on macroscopic drop motion.

Purpose of the Study:

To simulate and analyze the spreading and retraction of two-dimensional drops on thin films in the small slope limit.
To investigate the relationship between apparent contact line velocity and dynamic contact angles, considering disjoining pressure effects.
To explore the influence of drop scale and thin film stability regimes on drop rearrangement dynamics.

Main Methods:

Numerical simulations in the small slope limit for drop heights from nanometers to hundreds of nanometers.

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Modeling disjoining pressure including van der Waals and acid-base interactions.

Analyzing drop rearrangement for different wetting conditions (spreading, stable retraction, spinodally unstable retraction).

Main Results:

Small drops are significantly affected by disjoining pressure gradients across their entire base.
Larger drops initially follow macroscopic behavior described by Tanner's law.
Retraction over spinodally unstable films exhibits three distinct regimes: rim formation, propagation, and disappearance, with Tanner's law applicable in later stages.

Conclusions:

Thin film dynamics critically influence drop rearrangement, even after macroscopic behavior (Tanner's law) emerges.
Ignoring thin film effects can lead to inaccurate simulations of drop retraction.
The study provides insights into the complex interplay between drop scale, wetting conditions, and thin film stability.