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Dip-coating of suspensions
Adrien Gans1, Emilie Dressaire, Bénédicte Colnet
1Surface du Verre et Interfaces, UMR 125 CNRS/Saint-Gobain, 93300 Aubervilliers, France.
Soft Matter
|December 14, 2018
Summary
This study investigates fluid and particle coating on a plate during withdrawal. Three distinct coating regimes were identified based on withdrawal speed and particle concentration, impacting film thickness.
Area of Science:
- Fluid dynamics
- Colloid science
- Surface science
Background:
- Plate withdrawal from a fluid results in coating.
- The Landau-Levich problem describes liquid film entrainment.
- Particle suspensions introduce complexities to coating phenomena.
Purpose of the Study:
- Investigate the Landau-Levich problem for non-Brownian particle suspensions.
- Identify different coating regimes based on experimental parameters.
- Determine the influence of withdrawal velocity, particle volume fraction, and particle size on coating behavior.
Main Methods:
- Experimental study of plate withdrawal from particle suspensions.
- Varying withdrawal velocity (U), particle volume fraction (φ), and particle diameter (2a).
- Analysis of coating regimes and film thickness in relation to capillary number (Ca) and effective viscosity (η(φ)).
Main Results:
- Observed three distinct coating regimes: liquid-only, particle-inclusive following Landau-Levich law, and heterogeneous.
- No particle entrainment at low capillary numbers (Ca).
- Suspension film thickness follows Landau-Levich law with effective viscosity at high Ca.
- Intermediate Ca shows complex, heterogeneous coating.
Conclusions:
- The study elucidates three coating regimes in particle suspensions.
- Regime transitions are dependent on capillary number, volume fraction, and particle properties.
- Effective viscosity governs particle suspension coating at high capillary numbers.
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