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Large-scale kinetic roughening behavior of coffee-ring fronts
B G Barreales1,2, J J Meléndez1,2, R Cuerno3
1Departamento de Física, Universidad de Extremadura, 06006 Badajoz, Spain.
Physical Review. E
|November 18, 2022
Summary
This study investigates coffee-ring aggregate growth using numerical simulations. We found a discontinuous transition and anomalous scaling, with patch affinity significantly altering aggregate morphology and dynamics.
Area of Science:
- Soft Matter Physics
- Materials Science
- Complex Systems
Background:
- Coffee-ring aggregates form during solvent evaporation, leaving a deposit ring.
- Understanding the kinetic roughening of these aggregates is crucial for controlling their morphology.
Purpose of the Study:
- To investigate the kinetic roughening behavior of coffee-ring aggregate fronts.
- To elucidate the role of patchy colloid affinity on aggregate morphology and scaling properties.
Main Methods:
- Extensive numerical simulations of an off-lattice ballistic deposition model for patchy colloids.
- Analysis of kinetic roughening exponents and correlation functions.
- Investigation across a range of patch affinity parameters (r_AB).
Main Results:
- A discontinuous pinning-depinning transition was observed at r_AB=0, exhibiting anomalous scaling with specific exponents.
- For r_AB > 0, patch structure induces morphological instability, leading to macroscopic shape dominance.
- A crossover to one-dimensional KPZ exponents occurs for r_AB > 0.01, while r_AB ≤ 0.01 is dominated by r_AB=0 behavior.
Conclusions:
- Aggregate fronts remain in the moving phase for 0 < r_AB ≤ 1.
- Kinetic roughening behavior is intrinsically anomalous for r_AB ≤ 0.01.
- Patch affinity (r_AB) critically influences the morphological instability and scaling of coffee-ring aggregates.
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