DOI: 10.11648/j.sdc.20260102.12 ISSN: 3143-0597

Examination of Excess Thermodynamic Properties Catalysed by Aromatic Hydrocarbons for the Binary Liquid Systems at 298.15K

Dhirendra Sharma, Chandrapal Prajapati, Gauri Khanwalkar, Sandeep Sahu
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In this study, the thermo-acoustical and physicochemical behavior of a binary liquid mixture was investigated over the entire concentration range at 298.15K. Utilizing experimentally measured data of density (ρ) viscosity (η) and ultrasonic velocity (u), primary physical properties were computed, including the intermolecular free length (L f ), surface tension (S), acoustic impedance (Z), and relaxation time ( τ ). To gain deeper insights into the structural arrangements and the nature of molecular interactions within the mixture, the corresponding excess parameters excess surface tension (S E ), excess acoustical impedance (Z E ), excessrelaxation time (τ E ) and excess intermolecular free length ( L f E ) were derived. The variations of these excess properties as a function of mixture composition were analyzed and fitted using the Redlich–Kister polynomial equation. The trends observed in these excess parameters offer direct evidence regarding the strength and nature of the molecular packing and hetero-molecular interactions present within the system. These results contribute valuable empirical profiles required for validating fluid theories and optimizing chemical processing models. The sign and magnitude of the calculated excess values reveal the existence of weak interactions between the component molecules, providing vital thermodynamic data for industrial and process engineering applications. The variation of physical properties such as surface tension (S), intermolecular free length (L f ), relaxation time ( τ ) and acoustic impedance (Z) with mixture composition confirms the presence of molecular interactions among the constituent components. Furthermore, the positive deviations observed across all corresponding excess parameters (S E ), (Z E ), ( L f E ) and (τ E ) indicate weak-to-moderate interactions within these systems, dominated primarily by π–π and solute-solvent interaction

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