Investigation of transport and acoustic properties of binary mixtures of 2–amino–1–butanol with isomeric butanol at 298.15 K–318.15 K: Graph theoretical approach and bloomfield–Devan model

Background

Transport and acoustic properties for binary mixtures of 2–amino-1–butanol (2AB) with isomeric butanol were measured across the temperature range (298.15–318.15) K. This study focuses on the deviation in viscosity ($\Delta \eta$), speed of sound ($\Delta u$), and excess isentropic compressibility (${\kappa }_S^E$) to explore the intermolecular interactions in the mixtures.

Methodology

The $\Delta \eta$, $\Delta u$, and ${\kappa }_S^E$ were derived from experimental measurements. The Bloomfield–Devan model (BFD) and the Graph theoretical approach (GTA) were applied to analyze the $\Delta \eta$ and ${\kappa }_S^E$ data at 298.15 K, respectively. Several empirical relations–such as Nomoto, Van Dael, Impedance, and Schaaff's collision factor (CFT) theory were used to corroborate the $\Delta u$data. In contrast, Jacobson's free length theory (JFLT) was employed to predict the $\Delta u$data.

Significant Findings

The excess/deviation in properties was analyzed to elucidate intermolecular interactions in the mixtures. The $\Delta \eta$ values exhibit the pattern: tert–butanol > sec–butanol > isobutanol > n–butanol whereas $\Delta u$ values follow an opposite trend. Theoretical predictions aligned closely with experimental results, and the impact of temperature on the observed properties was also analyzed.