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Related Experiment Video

Updated: May 9, 2026

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

Published on: September 8, 2023

Polarization as a field variable from molecular dynamics simulations.

Kranthi K Mandadapu¹, Jeremy A Templeton, Jonathan W Lee

¹Sandia National Laboratories, Livermore, California 94551-0969, USA.

The Journal of Chemical Physics

|August 10, 2013

Summary

This summary is machine-generated.

A new computational framework calculates macroscopic polarization density from molecular dynamics simulations. This method accurately characterizes electrical double layers in electrolyte solutions, revealing length scales crucial for understanding surface charge effects.

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Spatial Separation of Molecular Conformers and Clusters

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Published on: January 9, 2014

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Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Area of Science:

Computational physics
Physical chemistry
Materials science

Background:

Macroscopic polarization density is crucial for understanding electrostatic phenomena.
Existing methods struggle to bridge molecular and continuum scales for polarization calculations.
The Irving and Kirkwood procedure provides a basis for calculating macroscopic properties from atomic variables.

Purpose of the Study:

To develop a theoretical and computational framework for calculating macroscopic polarization density from molecular dynamics simulations.
To extend the Irving and Kirkwood procedure to electrostatics.
To apply the framework to characterize electrical double layers in electrolyte solutions.

Main Methods:

Extending the Irving and Kirkwood procedure to electrostatics.
Developing a coarse-graining approach to connect molecular and continuum scales.
Applying the framework to bulk water and a 1:1 electrolyte solution.

Main Results:

The framework successfully calculates macroscopic polarization density, incorporating molecular dipole, quadrupole, and higher-order moments.
The dielectric constant of bulk water was accurately reproduced, validating the method.
An intermediate asymptotic length scale was identified in the electrical double layer, validating Poisson-Boltzmann theory in specific regions.

Conclusions:

The developed framework provides a systematic method for calculating macroscopic polarization density from molecular dynamics.
The framework accurately characterizes electrical double layers, identifying diffuse and condensed/Stern layer lengths.
This approach offers a powerful tool for studying electrostatic phenomena across various concentrations and surface charges.