Synthesis and Study of Thermo Acoustic Properties of α-Al2O3 Nano Suspension in Ethanol Base Fluid

The present paper reports the synthesis and study of thermo acoustic properties of alpha alumina (α-Al₂O₃) nano suspension in ethanol base fluid. α-Al₂O₃ nanoparticles were synthesized through alkoxide route using sol-gel method. Aluminum isopropoxide Al (OC₃H₇)3, and aluminum nitrate nanohydrate Al (NO3)3 9 H₂O were used for preparing alumina solution. Sodium dodecylbenzene sulfonate (SDBS) was used as the surfactant stabilizing agent. The sample was characterized by X- ray diffraction (XRD) and scanning electron microscopy (SEM). Average particle size has been estimated by using Debye-Scherrer formula. The ultrasonic velocity measurement at 4 MHz with an interferometric technique has been made on alpha alumina (α-Al₂O₃) nano suspension in ethanol base fluid. Measurements were also taken for the density and viscosity. The thermo acoustic parameters were calculated from the velocity, density and the viscosity measurements. By taking measurements over entire range of concentrations and temperatures, we obtained information about the aggregation of nanoparticles in the suspended medium. Thermo acoustic parameters are related to the surface of nanoparticles and nanoparticle surfactant interactions and help for the study of thermo acoustic properties of nanosuspension.