Subambient applications of differential thermal analysis for the determination of vapor pressure

Brozena, Ann; Fielder, Donald

doi:10.1016/0040-6031(92)80220-q

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The vapor pressure of the sample was determined by recording the rate of weight loss from the cup at multiple controlled temperatures under reduced pressure, P = (10 –5 ) Pa. To validate system operation, the vapor pressure of naphthalene was determined at P = (0.13 to 13) Pa. The experimental vapor pressure of naphthalene obtained using this procedure agreed with the results reported in the literature to within 2 %. − …”

Section: Methodssupporting

confidence: 70%

Vapor Pressure of Triethyl and Tri-n-Propyl Phosphates and Diethyl Malonate

et al. 2014

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Triethyl phosphate (TEPO,, tri-npropyl phosphate (TPPO,, and diethyl malonate (DEM, are of considerable interest to the chemical defense community as nontoxic simulants for toxic chemical warfare agents. Vapor pressure data have been measured for TEPO at T = (271.25 to 480.15) K, for TPPO at T = (263.15 to 527.61) K, and for DEM at T = (265.15 to 471.25) K using a variety of standard methods that have been modified as necessary. The new data extend the range of vapor pressure data previously reported in the literature for each of the title compounds to subambient temperatures and to lower pressures by approximately 3 orders of magnitude for TEPO, 5 orders of magnitude for TPPO, and 1 order of magnitude for DEM. Vapor pressure data and derived properties, including volatility and temperature-dependent heats of vaporization are reported for TEPO, TPPO, and DEM along with comparisons to chemical warfare agent materials.

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Section: Methodssupporting

confidence: 70%

Vapor Pressure of Triethyl and Tri-n-Propyl Phosphates and Diethyl Malonate

et al. 2014

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“…Positron annihilation spectroscopy (PAS) is a spectroscopy technique that uses positrons as a probe to yield unique information regarding various properties of materials by analyzing the energy spectra of the annihilation photons. When a positron is injected into a solid from a positron source, such as 22 Na, 64 Cu, or 58 and phonon interactions. 95 In a non(metal/alloy) medium, such as nonmetal porous media, a significant fraction of positrons could capture an electron to form the hydrogen-like atomic state positronium (Ps), which has two ground states, i.e., parapositronium (p-Ps) and orthopositronium (o-Ps).…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…Differential thermal analysis (DTA) and differential scanning calorimetry (DSC), which use a heating process performed in an open system, are the two commonly used thermal analysis methods for phase transition measurements. Both methods have been applied to determine the boiling points or vapor pressures of different pure substances. − A regulated vacuum or controlled inert gas keeps the pressure constant at the atmospheric or a specific value. To standardize the procedure, ASTM E1782 (Standard Test Method for Determining Vapor Pressure by Thermal Analysis) has been established, which was then revised in 2014.…”

Section: Experimental Methodsmentioning

confidence: 99%

Experiments of Vapor–Liquid Phase Transition of Fluids Confined in Nanopores: Implications on Modeling

Adidharma

Tan

2022

Ind. Eng. Chem. Res.

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A review of the vapor–liquid phase transitions of confined fluids is presented with emphasis on recent experimental findings that have direct implications on modeling. Experimental methods to investigate the phase transition of confined fluids are also discussed. Although adsorption/desorption experiments are the most common and important methods in this field, other new methods are developed to investigate properties and behaviors that are not easily done using adsorption/desorption, such as the recent isochoric-cooling experiments using differential scanning calorimetry (DSC) that provide new findings and insights into different aspects of phase transition of confined pure fluids and mixtures, as well as experiments using nanofluidic devices that gain some attentions due to their ability to visually observe what is happening in the pores. For the modeling, engineering equations of state, which are the most attractive models for industries, are discussed. Although some promising results of these equations of state have been achieved, a lot of work still needs to be done as new findings have been experimentally unveiled. Future experiments needed for deeper physics understanding and better model development on nanoconfined fluids are identified.

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“…Methods have been published which allow the determination of vapor pressure in equilibrium with a liquid from DSC or DTA measurements (66,67).…”

Section: Thermodynamic Measurementsmentioning

confidence: 99%