Thermodynamic Properties of Aqueous Solutions and Electrolytes
Summary
Aqueous electrolyte solutions underpin processes in energy storage, environmental science, industrial separation and geochemistry. Their nonideality arises from electrostatic interactions, solvation structure and concentration-dependent dielectric response, which collectively influence activity and osmotic coefficients, solubility limits and phase equilibria. Central thermodynamic functions such as Gibbs free energy, chemical potentials and activity coefficients describe deviations from ideal behaviour and govern speciation, precipitation and transport phenomena. Advances in theoretical frameworks, from continuum models to molecular simulation and equations of state, have markedly improved predictions of ion-solvent interactions over wide temperature, pressure and concentration ranges. Practical applications include design of high-performance batteries, optimisation of metal recovery, control of scaling in geothermal and industrial systems, and safe management of radioactive wastes.
Research from Nature Portfolio
Recent high-temperature experiments have revealed a neutral uranium chloride species that remains stable under reducing, acidic brine conditions above 100 °C. This overturns the long-standing assumption that uranium mobility ceases in its reduced state and compels a revision of geochemical and reactor-coolant transport models. By identifying nontraditional aqueous complexes, the work emphasises the need to expand thermodynamic databases and integrate novel species into predictive frameworks for ore formation, nuclear waste behaviour and deep-Earth fluid dynamics.
Thermodynamic Properties of Aqueous Solutions and Electrolytes publication trend
The graph below shows the total number of articles in thermodynamic properties of aqueous solutions and electrolytes across all publications each year (not limited to Nature Index journals).
Technical terms
Activity coefficient: A factor quantifying deviation from ideal solution behaviour due to ionic interactions.
Osmotic coefficient: A measure of the effect of solute on the chemical potential of the solvent, related to osmotic pressure.
Debye–Hückel theory: A model for long-range electrostatic interactions in dilute electrolyte solutions, yielding activity coefficients at low ionic strength.
Born equation: A continuum electrostatic expression for the solvation free energy of an ion based on dielectric screening.
Dielectric constant: A dimensionless property indicating a medium’s ability to reduce the effective electric field between charges.
Phase equilibrium: The condition under which multiple phases coexist at constant temperature, pressure and overall composition.
Statistical associating fluid theory (SAFT): An equation-of-state framework that models molecular fluids by accounting for dispersion, association and chain formation.
References
- Modeling the effects of salt concentration on aqueous and organic electrolytes. npj Computational Materials (2023).
- Uranium transport in acidic brines under reducing conditions. Nature Communications (2018).
- Prediction of salting‐out in liquid‐liquid two‐phase systems with ePC‐SAFT: Effect of the Born term and of a concentration‐dependent dielectric constant. Zeitschrift für anorganische und allgemeine Chemie (2021).
- A generalized Debye-Hückel theory of electrolyte solutions. AIP Advances (2019).
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