An investigation of the saturated vapor pressure for the solutions of Al₂O₃ nanoparticles in the isopropanol and fullerenes C₆₀ in o-xylene is presented in this paper. An average size of Al₂O₃ nanoparticles was measured by transmission electron microscopy (TEM) and found to be equal 27.3 nm whereas a hydrodynamic diameter for the same nanoparticles in isopropanol does not exceed 50 nm. The measurement of the saturated vapor pressure is conducted using a static method in a temperature range from 300 K to 350 K for the nanofluids with the mass concentrations 0–9.55% of the nanoparticles Al₂O₃ in isopropanol and the mass concentration 0–0.55% of fullerenes C₆₀ in o-xylene.

An analysis revealed that the total uncertainty of the measured saturated vapor pressure for the nanofluids does not exceed 242 Pa and 559 Pa for the solutions of the isopropanol/Al₂O₃ and o-xylene/C₆₀ respectively. The temperature and concentration dependences of the saturated vapor pressure for the nanofluids have been discussed. The latent heat of evaporation was calculated and examined using experimental information on the saturated vapor pressure of the nanofluids. It was proven that additives of the nanoparticles Al₂O₃ and fullerenes C₆₀ could both increase and decrease the saturated vapor pressure and the latent heat of evaporation of the isopropanol and o-xylene. We also discussed a hypothesis that explains changes in the saturated vapor pressure and the latent heat of evaporation of the nanofluids not only by the temperature and concentration of the nanoparticles in the nanofluids but also through structural changes in the base fluids due to a presence of Al₂O₃ and C₆₀ additives.

本文研究了Al ₂ O ₃纳米粒子在异丙醇和富勒烯C ₆₀在邻二甲苯中的溶液的饱和蒸气压。通过透射电子显微镜（TEM）测量Al ₂ O ₃纳米颗粒的平均尺寸，发现其等于27.3nm，而相同纳米颗粒在异丙醇中的流体力学直径不超过50nm。对于静态质量浓度为0-9.55％的纳米颗粒Al ₂ O ₃在异丙醇中的质量浓度为0-0.55的纳米流体，使用静态方法在300 K至350 K的温度范围内进行饱和蒸气压的测量。富勒烯C的百分比₆₀在邻二甲苯中。

分析表明，对于异丙醇/ Al ₂ O ₃和邻二甲苯/ C ₆₀溶液，纳米流体的饱和蒸汽压的总不确定度分别不超过242 Pa和559 Pa 。已经讨论了纳米流体的饱和蒸气压的温度和浓度依赖性。使用关于纳米流体的饱和蒸气压的实验信息来计算和检查蒸发潜热。证明了纳米颗粒Al ₂ O ₃和富勒烯C _60的添加剂可以同时增加和减少异丙醇和邻二甲苯的饱和蒸气压和蒸发潜热。我们还讨论了一个假说，该假说不仅可以解释纳米流体的饱和蒸气压和蒸发潜热的变化，不仅可以通过纳米流体中纳米颗粒的温度和浓度，还可以通过存在Al的基础流体的结构变化来解释₂ O ₃和C ₆₀添加剂。