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Multiscale modeling of a rectifying bipolar nanopore: explicit-water versus implicit-water simulations
Zoltán Ható1, Mónika Valiskó2, Tamás Kristóf2
1Department of Physical Chemistry, University of Pannonia, P. O. Box 158, H-8201 Veszprém, Hungary. boda@almos.vein.hu and Institute of Advanced Studies Köszeg (iASK), Chernel st. 14, H-9730 Köszeg, Hungary.
Physical Chemistry Chemical Physics : PCCP
|June 29, 2017
Summary
Multiscale modeling of nanopores shows reduced models accurately predict device function, despite molecular-level inaccuracies. This validates their use in device design and understanding.
Area of Science:
- Computational Nanoscience
- Multiscale Modeling
- Ion Transport Phenomena
Background:
- Nanopore devices are crucial for various applications, but accurate simulation requires balancing computational cost and physical detail.
- Understanding ion transport at the nanoscale is essential for designing and optimizing these devices.
- The validity of reduced computational models for nanoscale systems remains a key question.
Purpose of the Study:
- To compare simulation results from all-atom and reduced models for a rectifying bipolar nanopore.
- To assess the accuracy of a reduced model (implicit water, Local Equilibrium Monte Carlo, Nernst-Planck) against an all-atom model (explicit water, molecular dynamics).
- To investigate whether reduced models can capture essential device-level physics despite molecular-level discrepancies.
Main Methods:
- All-atom molecular dynamics simulations with explicit water for direct ion transport simulation.
- Reduced model using implicit water, Local Equilibrium Monte Carlo, and Nernst-Planck equation for faster calculations.
- Comparative analysis of electrical current, concentration profiles, and potential profiles between the two models.
Main Results:
- Both models qualitatively reproduced similar electrical current behavior across different voltages and parameters.
- Significant differences in detailed concentration and potential profiles were observed between explicit and implicit water models.
- These molecular-level differences did not affect the z-dependence of concentration profiles, which are critical for device function.
Conclusions:
- Reduced models, despite molecular-scale inaccuracies, can accurately represent the overall device physics and function of nanopores.
- The study resolves the paradox of reduced models predicting experimental data by highlighting their focus on device-relevant physics.
- Reduced models are suitable for general device understanding and design, while all-atom models are necessary for molecular-level insights.
