Exploring Density, Viscosity, and Friction Theory in the Interaction of Linalool (3,7-Dimethylocta-1,6-dien-3-ol) with 2-Alkanol

Abstract

This investigation undertakes a thorough examination of the thermophysical properties of linalool (C₁₀H₁₈O) blended with a series of 2-alkanols (ranging from 2-propanol to 2-hexanol) across a temperature spectrum of 293.15 K to 323.15 K. The primary objective of this study is to elucidate the density and viscosity behavior of these binary systems. The experimental results reveal negative deviations from ideality in excess molar volume for linalool with 2-propanol up to 2-pentanol, and positive values for linalool with 2-hexanol, accompanied by negative viscosity deviations across all examined mixtures. The observed negative excess volume suggests the presence of strong intermolecular interactions between linalool and the 2-alkanols, which is indicative of the formation of hydrogen bonds in the mixtures. The positive values of excess molar volumes in linalool and 2-hexanol are indicative of the governing of steric hindrance effects on attractive intermolecular forces. Moreover, the Friction theory (f-theory) was utilized to model the viscosity of the binary mixtures, yielding an excellent concordance with the experimental data, with a maximum discrepancy of merely 2.25 % observed in the linalool + 2-pentanol system. This negligible deviation underscores the efficacy of the f-theory in accurately capturing the viscosity measurements, thereby validating its applicability in predicting the rheological behavior of such binary systems.