Research into the influence OF AL2O3 nanoparticle admixtures on the magnitude of isopropanol molar volume

Prediction of nanofluids properties: the density and the heat capacity

“…Thirdly, data on the diameter of the adsorption layer of the base fluid on nanoparticles obtained by processing the information about nanofluid of isopropanol/Al 2 O 3 nanoparticles are in good agreement with data of the dynamic light scattering measurements [14]. Information on the diameter of the diffusive layer obtained by processing data on the heat capacity of nanofluids satisfactorily agrees with data obtained by spectroturbidimetry method at low concentrations of nanoparticles in isopropanol.…”

“…Equivalent sizes of nanoparticles under normal conditions can be easily obtained by dynamic light scattering and by spectroturbidimetry methods. Figure 9 shows that the values of the isobaric mole heat capacity, which is calculated using the characteristic sizes of nanoparticles in the base fluid [14] are in a good agreement with experimental data on the heat capacity of isopropyl alcohol/Al 2 O 3 nanoparticles at a temperature of 293 K. Since optical studies are generally performed at environment temperature, the proposed method cannot predict the isobaric heat capacity of nanofluids in a wide range of the state parameters. To solve this problem, we propose to use the method of predicting the thermophysical properties of substances on the boiling line, which is based on the application of the basic principles of extended scaling [18].…”

“…In this model, only the density of nanofluids (the diameter of the adsorption layer of molecules on the surface of nanoparticles [14]) and the equivalent diameter of nanoparticles, which can be determined by the method of spectroturbidimetry can be used as initial data.…”

“…As initial information, we used data on the density and heat capacity of a model nanofluid consisting of isopropyl alcohol and alumina oxide nanoparticles Al 2 O 3 [14,15]. Selecting of this object of study was due to high stability of colloidal solutions of isopropanol/Al 2 O 3 nanoparticles.…”

“…To solve this problem, we used data on the excess thermodynamic functions -diameter of the adsorption phase obtained from data on the nanofluids density [14]; • -data on the diameter of the diffuse layer obtained from the heat capacity data at 293 K [15]. The information in figures 6-8 allows us to formulate several conclusions.…”