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A minimal model for solvent evaporation and absorption in thin films
Matthew G Hennessy1, Giulia L Ferretti1, João T Cabral1
1Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.
Journal of Colloid and Interface Science
|November 9, 2016
Summary
This study introduces a minimal model for solvent evaporation and absorption in thin films, enabling accurate prediction of drying and sorption dynamics. The model successfully extracts key parameters like mass transfer coefficient and diffusivity from experimental data.
Area of Science:
- Physical Chemistry
- Materials Science
- Chemical Engineering
Background:
- Thin film formation involves complex solvent evaporation and absorption processes.
- Understanding these dynamics is crucial for applications in coatings, packaging, and electronics.
- Existing models may not fully capture the interplay of solvent and solute behavior.
Purpose of the Study:
- To develop a minimal, predictive model for solvent evaporation and absorption in thin films.
- To extract key physical parameters (mass transfer coefficient, diffusivity) from experimental data.
- To understand the conditions leading to skin formation during drying and saturation fronts during absorption.
Main Methods:
- Asymptotic analysis of a minimal thin film model.
- Development of expressions for parameter extraction.
- Utilizing a state diagram to analyze drying conditions.
- Comparison with experimental data from dynamic vapor sorption.
Main Results:
- The model accurately predicts drying and sorption dynamics.
- Physically significant parameters are extractable from experimental data.
- The model correctly predicts skin formation and saturation front propagation.
- Excellent agreement was found with experimental data for ternary mixtures.
Conclusions:
- The minimal model provides a robust framework for analyzing thin film solvent dynamics.
- The model is broadly applicable across diverse industrial applications.
- It facilitates the understanding and control of film formation and material properties.
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