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<p>This work explores how molecules interact in binary and ternary aqueous mixes of choline salicylate with sodium sulphate (<i>Na</i><sub><i>2</i></sub><i>SO</i><sub><i>4</i></sub>) and sodium bicarbonate (NaHCO<sub>3</sub>) using a combined thermodynamic, volumetric, and acoustic approach. Density and sound speed were measured at 288.15–318.15&#xa0;K and choline salicylate concentrations of 0.0590, 0.0688, and 0.0885&#xa0;mol∙kg⁻<sup>1</sup>. Based on these measurements, values such as apparent and partial molar volumes, isentropic compressibility, apparent specific volume, thermal expansion, partial molar expansibilities, and transfer volumes were determined. The analysis includes derivative thermodynamic properties and evaluates relative association and relaxation strength to assess molecular aggregation and structural dynamics. The co-sphere overlaps model and McMillan–Mayer theory reveals how choline salicylate and inorganic salts modulate interactions between solute and solvent molecules, influencing the structure-making or disrupting behaviour of the system. These findings provide new insights into solvation dynamics and molecular association in aqueous media, with implications for the design of advanced solvent systems and a deeper understanding of solution chemistry.</p>

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Thermophysical and Acoustic Investigation of Molecular Interactions in Choline Salicylate Solutions Containing Sodium Sulphate and Sodium Bicarbonate

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Mashahid Hussain Choudhary,
  • Nabaparna Chakraborty,
  • Kailash Chandra Juglan

摘要

This work explores how molecules interact in binary and ternary aqueous mixes of choline salicylate with sodium sulphate (Na2SO4) and sodium bicarbonate (NaHCO3) using a combined thermodynamic, volumetric, and acoustic approach. Density and sound speed were measured at 288.15–318.15 K and choline salicylate concentrations of 0.0590, 0.0688, and 0.0885 mol∙kg⁻1. Based on these measurements, values such as apparent and partial molar volumes, isentropic compressibility, apparent specific volume, thermal expansion, partial molar expansibilities, and transfer volumes were determined. The analysis includes derivative thermodynamic properties and evaluates relative association and relaxation strength to assess molecular aggregation and structural dynamics. The co-sphere overlaps model and McMillan–Mayer theory reveals how choline salicylate and inorganic salts modulate interactions between solute and solvent molecules, influencing the structure-making or disrupting behaviour of the system. These findings provide new insights into solvation dynamics and molecular association in aqueous media, with implications for the design of advanced solvent systems and a deeper understanding of solution chemistry.