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Single-file transport of binary hard-sphere mixtures through periodic potentials
David Voráč1, Philipp Maass2, Artem Ryabov1
1Charles University, Faculty of Mathematics and Physics, Department of Macromolecular Physics, V Holešovičkách 2, CZ-18000 Praha 8, Czech Republic.
The Journal of Chemical Physics
|September 19, 2023
Summary
Polydispersity significantly impacts single-file transport of hard spheres. A fundamental unit cell governs particle currents, allowing predictions based on sphere size and mixture ratios.
Area of Science:
- Physics
- Statistical Mechanics
- Soft Matter Physics
Background:
- Single-file transport is crucial in diverse systems like nanopores and cellular processes.
- Understanding particle behavior in confined spaces is essential for nanotechnology and biophysics.
Purpose of the Study:
- Investigate polydispersity effects on particle currents in single-file Brownian motion.
- Analyze how hard sphere diameters and mixing ratios influence particle flow through periodic potentials.
Main Methods:
- Theoretical analysis of single-file Brownian motion.
- Extensive Brownian dynamics simulations of binary hard sphere mixtures.
- Examination of particle currents under a constant drag force in periodic potentials.
Main Results:
- Discovered a recurring pattern in particle currents dependent on sphere diameters and mixing ratio.
- Identified a basic unit cell in the diameter space, enabling prediction of currents for any mixture.
- Explained current variations through changes in the effective potential barrier.
Conclusions:
- Polydispersity introduces predictable patterns in single-file transport.
- The unit cell concept simplifies the analysis of complex mixtures.
- Effective potential barrier modulation is key to understanding current fluctuations.
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