期刊
SIAM JOURNAL ON APPLIED MATHEMATICS
卷 81, 期 4, 页码 1645-1667出版社
SIAM PUBLICATIONS
DOI: 10.1137/19M1310098
关键词
Poisson-Nernst-Planck equations; correlations; Green's function; WKB approximations
资金
- Natural Science Foundation of China [11701428]
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation
- Fundamental Research Funds for the Central Universities
- NSFC [12071288]
- Shanghai Science and Technology Commission [20JC1414100]
- HPC center of Shanghai Jiao Tong University
The study develops a modified Poisson-Nernst-Planck model that accurately describes ion transport in complex environments by including both long-range and short-range correlations. The Coulomb correlation is handled by solving a generalized Debye-Huckel equation, while hard-sphere correlation is modeled using modified fundamental measure theory. The resulting model is capable of addressing problems beyond mean-field theory, such as variable dielectric media, multivalent ions, and strong surface charge density, showing improved accuracy compared to other modified models in capturing physical properties near interfaces.
We develop a modified Poisson-Nernst-Planck model which includes both the long-range Coulomb and short-range hard-sphere correlations in its free energy functional such that the model can accurately describe the ion transport in complex environment and under a nanoscale confinement. The Coulomb correlation including the dielectric polarization is treated by solving a generalized Debye-Huckel equation which is a Green's function equation with the correlation energy of a test ion described by the self Green's function. The hard-sphere correlation is modeled through the modified fundamental measure theory. The resulting model is available for problems beyond the mean-field theory such as problems with variable dielectric media, multivalent ions, and strong surface charge density. We solve the generalized Debye-Huckel equation by the Wentzel-Kramers-Brillouin approximation, and study the electrolytes between two parallel dielectric surfaces. In comparison to other modified models, the new model is shown to be more accurate in agreement with particle-based simulations and capturing the physical properties of ionic structures near interfaces.
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