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Dynamical screening and ionic conductivity in water from ab initio simulations.

Martin French1, Sebastien Hamel, Ronald Redmer

  • 1Universität Rostock, Institut für Physik, D-18051 Rostock, Germany.

Physical Review Letters
|November 24, 2011
PubMed
Summary
This summary is machine-generated.

We developed a new method to calculate ionic conductivity in complex fluids using ab initio simulations. This reveals insights into proton charge transport in warm dense water, applicable to planetary interiors.

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Area of Science:

  • Computational physics
  • Materials science
  • Physical chemistry

Background:

  • Calculating ionic conductivity in complex fluids under extreme conditions is challenging.
  • Ab initio simulations offer a powerful tool for understanding material properties at the atomic level.

Purpose of the Study:

  • To present a novel method for calculating ionic conductivities of complex fluids from ab initio simulations.
  • To apply this method to warm dense water and investigate proton charge transport.

Main Methods:

  • Combining density functional theory molecular dynamics simulations with polarization theory.
  • Utilizing the Green-Kubo formula with time-dependent effective charges of electronically screened ions.
  • Applying the method to two phases of warm dense water.

Main Results:

  • Observed large fluctuations in effective charges during simulations.
  • Demonstrated that protons can transport effective charges greater than +e on ultrashort timescales.
  • Compared results with a simpler diffusion-based model for ionic conductivity.

Conclusions:

  • The developed method accurately calculates ionic conductivities for complex fluids.
  • Proton dynamics in warm dense water exhibit unique charge transport characteristics.
  • The approach is extendable to study ionic conductivity in electronically insulating materials under extreme conditions, such as in planetary interiors.