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Diversity-induced resonance at surfactant-laden interfaces.
1Università Campus Bio-Medico di Roma, National Institute of Chemical Physics and Biophysics,, Rävala 10, Tallinn 15042, Estonia and Department of Engineering, Via Á. del Portillo 21, 00128 Rome, Italy.
Physical Review. E
|March 20, 2026
Summary
Diversity-induced resonance amplifies weak signals in coupled nonlinear systems. This study models surfactant interfaces, showing intermediate diversity maximizes signal amplification and enhances robustness, aligning with diversity-induced resonance (DIR) principles.
Area of Science:
- Physical Chemistry
- Nonlinear Dynamics
- Surface Science
Background:
- Networks of coupled nonlinear elements can amplify weak periodic signals through diversity-induced resonance (DIR).
- Surfactant-laden interfaces exhibit complex dynamics relevant to signal processing and material science.
- Understanding interfacial phenomena is crucial for applications ranging from drug delivery to materials engineering.
Purpose of the Study:
- To investigate the applicability of diversity-induced resonance (DIR) at surfactant-laden interfaces.
- To model and analyze the collective response of a heterogeneous interfacial system.
- To connect theoretical predictions to experimental observables for interfacial phenomena.
Main Methods:
- Modeling the surfactant interface as a 2D lattice of coupled patches with Frumkin adsorption-desorption kinetics.
- Applying sinusoidal modulation of monomer concentration to drive the system.
- Utilizing linear analysis and numerical simulations to compute the first-harmonic gain.
- Systematically varying diversity (patchwise variability) and other parameters.
Main Results:
- Intermediate levels of diversity were found to maximize the collective response of the interfacial network.
- The mean surface coverage increased by approximately 3-4 times compared to a homogeneous interface.
- The system demonstrated improved robustness to variations in signal frequency with intermediate diversity.
- The model successfully connected theoretical parameters to experimental observables.
Conclusions:
- Diversity-induced resonance (DIR) is a viable mechanism for signal amplification at surfactant-laden interfaces.
- Heterogeneity in adsorption drive is key to enhancing interfacial response and signal processing.
- The network coupling mechanism eliminates the need for empirical time constants or ad hoc relaxation pathways in the model.
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