Acoustic, volumetric, transport, optical and rheological properties of Benzyltripropylammonium based Deep Eutectic Solvents

The present study is focused on synthesis and physicochemical properties of a new class of Deep Eutectic Solvents (DESs) based on Benzyltripropylammonium chloride as hydrogen bond acceptor (HBA) and different hydrogen bond donors (HBD) like phenol, ethylene glycol, glycerol and lactic acid. Several physicochemical properties such as, density, speed of sound, conductivity and refractive index of these four DESs have been measured in the temperature range of 293.15-343.15 K and used to calculate various derived thermodynamic properties. Further, rheological measurements have been carried out to understand the viscosity and flow behavior of these DESs and also the influence of different hydrogen bonding environment on the nature of DESs. The temperature dependent density and viscosity values have been fitted using second order polynomial and well-known Vogel-Tammann-Fulcher (VTF) equations, respectively The experimental results implies that both the type of HBD and temperature has significant influence on the physicochemical characteristics of the synthesized DES. (C) 2017 Elsevier B.V. All rights reserved.