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Influence of pinning on diffusion in two-dimensional colloidal systems with tunable interparticle interactions.
Ilya R Denisenko1, Artur D Nasyrov1, Nikita P Kryuchkov1
1Bauman Moscow State Technical University, 2nd Baumanskaya Street 5, 105005 Moscow, Russia.
Physical Review. E
|September 16, 2025
Summary
This study quantifies how substrate pinning zones impact particle diffusion during controlled self-assembly in soft matter systems. Findings provide models for designing experiments in functional materials and tissue engineering.
Area of Science:
- Soft matter physics
- Colloidal science
- Materials science
Background:
- Controlled self-assembly using external fields is key for functional materials, 3D bioprinting, and tissue engineering.
- Substrate pinning zones influence diffusion and self-assembly, but their impact on diffusion remains poorly understood.
Purpose of the Study:
- To systematically investigate the effect of pinning zones on particle diffusion in a tunable 2D colloidal system.
- To develop predictive models for diffusion under varying attractive and repulsive interactions induced by external fields.
Main Methods:
- Molecular dynamics simulations were employed to model a monolayer of colloidal particles on a substrate with pinning zones.
- Diffusion was calculated across a wide parameter range, exploring different field-induced interaction regimes (attractive and repulsive).
Main Results:
- Simple, accurate fits were derived to describe the influence of pinning on diffusion across a broad phase diagram.
- The study systematically quantifies diffusion behavior in the presence of pinning zones.
Conclusions:
- The derived diffusion fits are valuable for experimental design and analysis in 2D soft matter systems.
- This work facilitates the development of novel functional materials and advancements in bioprinting and tissue engineering through controlled self-assembly.
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