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Dynamic viscosity and refractive index of aliphatic n-heptane with substituted aromatic hydrocarbons at T = (303.15 to 323.15) K and atmospheric pressure

Year: 2025

Type: article

Abstract: Dynamic viscosity and refractive index of aliphatic n -heptane with substituted aromatic hydrocarbons , such as toluene, o -xylene, and mesitylene were measured at T = (303.15 to 323.15) K and atmospheric pressure. The measurements were carried out over the whole range of composition using A -type Ostwald viscometer and Abbe Utility (Abbe 60/E) refractometer . From dynamic viscosity data, viscosity deviation and excess Gibbs free energy of activation were calculated, while the excess molar refraction was obtained from refractive index data. The values of dynamic viscosity and refractive index were fitted with concentration dependent 4th order polynomial equation and their excess values to the Redlich–Kister type polynomial equation. The viscosity deviation and excess free energy of activation with respect to mole fraction of aromatic hydrocarbons formed negative lobe with minima at x 2 = 0.55, whereas deviation of refractive index formed negative lobe for n -heptane + toluene system and positive lobe for n -heptane + o -xylene and n -heptane + mesitylene systems. Dispersive force is dominated in n -heptane + toluene system, whereas favorable geometric fitting is responsible for other two systems.

Source: Chemical Thermodynamics and Thermal Analysis

DOI: 10.1016/j.ctta.2025.100188

Authors: M. Abdur Rahaman, M. Kamrul Hossain, Shamim Akhtar, Hossain M. Shahadat

Institutions: Mawlana Bhashani Science and Technology University, University of Chittagong, Comilla University

Language: English

Topic: Thermodynamic properties of mixtures

Subfield: Fluid Flow and Transfer Processes

Field: Chemical Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,350

Funder: Ministry of Science and Technology, Government of the People’s Republic of Bangladesh