Electrostatic effects in nanosystems are understood via a physical picture built on their multiscale character and the distinct behavior of mobile ions versus charge groups fixed to the nanostructure. The Poisson–Boltzmann equation is nondimensionalized to introduce a factor that measures the density of mobile ion charge versus that due to fixed charges; the diffusive smearing and volume exclusion effects of the former tend to diminish its value relative to that from the fixed charges. We introduce the ratio of the average nearest-neighbor atom distance to the characteristic size of the features of the nanostructure of interest (e.g., a viral capsomer). We show that a unified treatment (i.e., ) and a perturbation expansion around yields, through analytic continuation, an approximation to the electrostatic potential of high accuracy and computational efficiency. The approach was analyzed via Padé approximants and demonstrated on viral system electrostatics; it can be generalized to accommodate extended Poisson-Boltzmann models, and has wider applicability to nonequilibrium electrodiffusion and many-particle quantum systems.
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7 May 2010
Research Article|
May 07 2010
Multiscale analytic continuation approach to nanosystem simulation: Applications to virus electrostatics
Abhishek Singharoy;
Abhishek Singharoy
Department of Chemistry, Center for Cell and Virus Theory,
Indiana University
, Bloomington, Indiana 47405, USA
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Anastasia M. Yesnik;
Anastasia M. Yesnik
Department of Chemistry, Center for Cell and Virus Theory,
Indiana University
, Bloomington, Indiana 47405, USA
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Peter Ortoleva
Peter Ortoleva
a)
Department of Chemistry, Center for Cell and Virus Theory,
Indiana University
, Bloomington, Indiana 47405, USA
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Abhishek Singharoy
Anastasia M. Yesnik
Peter Ortoleva
a)
Department of Chemistry, Center for Cell and Virus Theory,
Indiana University
, Bloomington, Indiana 47405, USA
a)
Electronic mail: [email protected].
J. Chem. Phys. 132, 174112 (2010)
Article history
Received:
December 16 2009
Accepted:
April 12 2010
Citation
Abhishek Singharoy, Anastasia M. Yesnik, Peter Ortoleva; Multiscale analytic continuation approach to nanosystem simulation: Applications to virus electrostatics. J. Chem. Phys. 7 May 2010; 132 (17): 174112. https://doi.org/10.1063/1.3424771
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