A study of acoustical parameters of cupric oxide nanoparticles dispersed in aqueous solutions of various glycols

Abstract

In this study cupric oxide (CuO) nanoparticles have been synthesised by precipitation method using cupric acetate dihydrate [Cu(CH₃COO)₂.2H₂O] as a starting material. The synthesised nanoparticles have been characterised by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). These nanoparticles have been dispersed in three different base fluids which are 10% aqueous solutions of ethylene glycol (EG), propylene glycol (PG) and hexylene glycol (HG). Ultrasonic velocity (<i>U</i>), density (ρ<i>) </i> and viscosity (η) of these nanofluids have been measured at different concentrations of CuO nanoparticles as a function of temperatures (<i>T</i> = 303.15 K, 308.15 K and 313.15 K). Using these values various acoustical parameters such as adiabatic compressibility, intermolecular free length, relaxation time, acoustic impedance and attenuation coefficient have been evaluated.