Investigation of the effect of nanoparticles on isopropyl alcohol saturated vapor pressure

This paper presents the results of the experimental study of the saturated vapor pressure of isopropyl alcohol / Al2O3 nanoparticles solutions. The average size of the Al2O3 nanoparticles determined by the scanning electron microscope method was 27.3 nm and the hydrodynamic diameter of the nanoparticles in isopropyl alcohol did not exceed 50 nm. The saturated vapor pressure was investigated by a static method using an original experimental setup in the temperature range 300 - 350 K and concentrations 2.53, 4.44, 6.87 and 9.55 wt.%. of Al2O3 nanoparticles in isopropyl alcohol. The description of the experimental setup for measuring the saturated vapor pressure of liquids is given. The performed analysis shows that the expanded uncertainty of the obtained experimental data on the saturated vapor pressure of nanofluids does not exceed 0.0006 bar (0.71%). Based on the experimental data we have obtained the information on the effect of Al2O3 nanoparticles additives on the saturated vapor pressure of isopropyl alcohol in a wide range of temperatures and nanoparticle concentrations. The analysis of the temperature and concentration dependences of the saturated vapor pressure of isopropyl alcohol / Al2O3 nanoparticles is given. It is shown that the additives of Al2O3 nanoparticles in isopropyl alcohol contribute to the increase in the saturated vapor pressure. Moreover, this effect increases with increasing temperature and concentration of Al2O3 nanoparticles. The greatest difference in the saturated vapor pressure of isopropyl alcohol / Al2O3 nanoparticle from that of pure isopropanol reaches 2.6%. The information presented in the paper is important for the development of models for predicting the caloric properties (isobaric heat capacity, enthalpy, and entropy) of nanofluids and for correct modeling of heat exchange processes.