An extended Stokes-Einstein model for condensed ionic water structures with topological complexity

Area of Science:

• Physical Chemistry
• Materials Science
• Chemical Physics

Background:

• The structure of water, particularly its condensed phases, remains a significant research challenge.
• Hydrophilic ions influence water structure through kosmotropic and chaotropic effects, introducing topological complexity.
• Understanding these complex interactions is crucial for various scientific disciplines.

Purpose of the Study:

• To develop a model describing the constitutive relationship between dynamic diffusion and topologically complex condensed water structures.
• To explore the geometrical and thermodynamic aspects of condensed ionic water structures in electrolyte solutions.
• To provide a framework for analyzing the influence of ions on water dynamics and structure.

Main Methods:

• An extended Stokes-Einstein model was developed, incorporating the Flory-Huggins free energy equation.
• A free-energy function was formulated to study thermodynamics in electrolyte aqueous solutions.
• The model's effectiveness was validated using molecular dynamics simulations and existing experimental data.

Main Results:

• The proposed model successfully describes the constitutive relationship between dynamic diffusion and condensed water structure with topological complexity.
• It provides a geometrical strategy based on end-to-end distance to analyze these structures.
• The model elucidates the topologically complex changes in condensed ionic water structures within electrolyte solutions.

Conclusions:

• The extended Stokes-Einstein model offers a novel approach to understanding ion-water interactions and condensed water structures.
• The findings contribute to a deeper comprehension of thermodynamics and dynamic diffusion in electrolyte solutions.
• This research provides a valuable tool for predicting and analyzing the behavior of water in the presence of ions.