Nielsen Robin V, Salimi Mohsen, Andersen John E V, Elm Jonas, Dantan Aurélien, Pedersen Henrik B
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
Rev Sci Instrum. 2024 Jun 1;95(6). doi: 10.1063/5.0215176.
We describe a new experimental system for direct measurements of the absolute saturation vapor pressures of liquid or solid samples. The setup allows the isolation of the sample under steady conditions in an ultra-high vacuum chamber, where the measurement of the sample's vapor pressure as a function of its temperature can be performed in a range around room temperature and in a pressure range defined only by the applied absolute pressure sensor. We characterize the setup and illustrate its capability to measure saturation vapor pressures as well as enthalpies of evaporation around room temperature with explicit measurements on four liquid compounds (diethyl phthalate, 1-decanol, 1-heptanol, and 1-hexanol) for which accurate vapor pressures have previously been reported.
我们描述了一种用于直接测量液体或固体样品绝对饱和蒸气压的新型实验系统。该装置能够在超高真空腔室的稳定条件下隔离样品，在该腔室中，可以在室温附近的温度范围内以及仅由所应用的绝对压力传感器定义的压力范围内，测量样品蒸气压随温度的变化。我们对该装置进行了表征，并通过对四种液体化合物（邻苯二甲酸二乙酯、1-癸醇、1-庚醇和1-己醇）进行明确测量，展示了其在室温附近测量饱和蒸气压以及蒸发焓的能力，此前已有这些化合物准确蒸气压的报道。
