Working Group: Physical Chemistry of Aqueous Systems

The Physical Chemistry of Aqueous Systems (PCAS) Working Group focuses on the exploration and characterization of the fundamental physical and chemical properties of water and its various solutions. Composed of experts from a diverse range of scientific backgrounds, the group conducts research, develops models, and formulates equations to accurately describe the properties of water over a wide range of conditions, including temperature, pressure, and chemical composition. Their work empowers the scientific and industrial communities by providing essential data and guidelines for applications in water-chemistry engineering, environmental studies, energy production, and more. The group's efforts contribute significantly to the understanding of the complexities of water-related phenomena, ensuring accurate and reliable information for various scientific and industrial advances.

These activities deepen our understanding of water and related substances and contribute to scientific and industrial progress.

Currently ongoing activities include the following:

Development of Formulation of Diffusion Coefficient of Water

Diffusion coefficients measure the transport of the mass of molecules within a fluid, which is critical to understanding the dynamic aspect of water. This project focuses on creating correlation functions to quantify diffusion coefficients of water as a function of temperature and pressure (density) over a wide range of thermodynamic states for which diffusivity data are available. The correlations will provide recommended values of the self-diffusion coefficient of water for use in various purposes such as industrial processes and environmental contexts.

Revision of the Formulation of the Water Ionization Constant (Kw)

The water dissociation constant (Kw) characterizes the extent to which water dissociates into hydrogen ions (H+) and hydroxide ions (OH). Kw is an important parameter for describing the physical chemistry of aqueous systems. This ongoing effort aims to revise the current formulation to accurately represent Kw over a wider range of conditions, with a more accurate representation at near-critical and supercritical conditions.

Physical Chemistry of Film-Forming Amines in High-Temperature Aqueous Solutions

Film-forming amines (FFA) are substances that exhibit anticorrosive effects on metals in high-temperature water systems. This project investigates the mechanisms of FFA film formation in high-temperature water and their behavior in hydrothermal reactions. Understanding the practical utility and behavior of FFA is intended to provide guidance in areas related to corrosion protection in steam power plants and industrial steam generators.

For further information, please contact the Working Group officers:
Chair: Ken Yoshida,, Tokushima University
Vice-Chair: Hugues Arcis,, National Nuclear Laboratory

This page updated November 30, 2023 >> Working Groups >> PCAS