scholarly journals Determination of the thermodynamic activities of LiF and ThF4in the LixTh1−xF4−3xliquid solution by Knudsen effusion mass spectrometry

2015 ◽  
Vol 17 (44) ◽  
pp. 30110-30118 ◽  
Author(s):  
Elisa Capelli ◽  
Ondřej Beneš ◽  
Jean-Yves Colle ◽  
Rudy J. M. Konings
Keyword(s):  
Mass Spectrometry ◽  
Vapour Pressure ◽  
Liquid Solution ◽  
Knudsen Effusion ◽  
Thermodynamic Activities ◽  
Knudsen Effusion Mass Spectrometry

Vapour pressure and thermodynamic activities of LiF and ThF4in the liquid solution are studied by Knudsen effusion mass spectrometry.

Determination of the Work Function for Europium Dibromide by Knudsen Effusion Mass Spectrometry

2012 ◽  
Vol 57 (2) ◽  
pp. 436-438 ◽  
Author(s):  
Lev S. Kudin ◽  
Mikhail F. Butman ◽  
Dmitry N. Sergeev ◽  
Vladimir B. Motalov ◽  
Karl W. Krämer
Keyword(s):  
Mass Spectrometry ◽  
Work Function ◽  
Knudsen Effusion ◽  
Knudsen Effusion Mass Spectrometry

scholarly journals Study of thermal stability of p-type skutterudites DD0.7Fe3CoSb12 by Knudsen effusion mass spectrometry

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21451-21459
Author(s):  
František Zelenka ◽  
Pavel Brož ◽  
Jan Vřešťál ◽  
Jiří Buršík ◽  
Gerda Rogl ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Thermal Stability ◽  
Vapour Pressure ◽  
Knudsen Effusion ◽  
Knudsen Effusion Mass Spectrometry ◽  
P Type ◽  
Thermal Stability Of

Antimony vapour pressure is measured by Knudsen effusion mass spectrometry in order to assess the thermal stability of p-type DD0.7Fe3CoSb12 thermoelectrics.

scholarly journals Measured Solid State and Sub-Cooled Liquid Vapour Pressures of Benzaldehydes Using Knudsen Effusion Mass Spectrometry

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 397
Author(s):  
Petroc Shelley ◽  
Thomas J. Bannan ◽  
Stephen D. Worrall ◽  
M. Rami Alfarra ◽  
Carl J. Percival ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Solid State ◽  
Vapour Pressure ◽  
Boiling Point ◽  
Point Method ◽  
Scanning Calorimetry ◽  
Knudsen Effusion ◽  
Pressure Method ◽  
Liquid Saturation ◽  
Knudsen Effusion Mass Spectrometry

Benzaldehydes are components of atmospheric aerosol that are poorly represented in current vapour pressure predictive techniques. In this study the solid state (PSsat) and sub-cooled liquid saturation vapour pressures (PLsat) were measured over a range of temperatures (298–328 K) for a chemically diverse group of benzaldehydes. The selected benzaldehydes allowed for the effects of varied geometric isomers and functionalities on saturation vapour pressure (Psat) to be probed. PSsat was measured using Knudsen effusion mass spectrometry (KEMS) and PLsat was obtained via a sub-cooled correction utilising experimental enthalpy of fusion and melting point values measured using differential scanning calorimetry (DSC). The strength of the hydrogen bond (H-bond) was the most important factor for determining PLsat when a H-bond was present and the polarisability of the compound was the most important factor when a H-bond was not present. Typically compounds capable of hydrogen bonding had PLsat 1 to 2 orders of magnitude lower than those that could not H-bond. The PLsat were compared to estimated values using three different predictive techniques (Nannoolal et al. vapour pressure method, Myrdal and Yalkowsky method, and SIMPOL). The Nannoolal et al. vapour pressure method and the Myrdal and Yalkowsky method require the use of a boiling point method to predict Psat. For the compounds in this study the Nannoolal et al. boiling point method showed the best performance. All three predictive techniques showed less than an order of magnitude error in PLsat on average, however more significant errors were within these methods. Such errors will have important implications for studies trying to ascertain the role of these compounds on aerosol growth and human health impacts. SIMPOL predicted PLsat the closest to the experimentally determined values.

scholarly journals Measured solid state and subcooled liquid vapour pressures of nitroaromatics using Knudsen effusion mass spectrometry

2020 ◽  
Vol 20 (14) ◽  
pp. 8293-8314
Author(s):  
Petroc D. Shelley ◽  
Thomas J. Bannan ◽  
Stephen D. Worrall ◽  
M. Rami Alfarra ◽  
Ulrich K. Krieger ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Solid State ◽  
Vapour Pressure ◽  
Scanning Calorimetry ◽  
Subcooled Liquid ◽  
Knudsen Effusion ◽  
Liquid Saturation ◽  
Knudsen Effusion Mass Spectrometry ◽  
Saturation Vapour Pressure ◽  
Selection Of Species

Abstract. Knudsen effusion mass spectrometry (KEMS) was used to measure the solid state saturation vapour pressure (PSsat) of a range of atmospherically relevant nitroaromatic compounds over the temperature range from 298 to 328 K. The selection of species analysed contained a range of geometric isomers and differing functionalities, allowing for the impacts of these factors on saturation vapour pressure (Psat) to be probed. Three subsets of nitroaromatics were investigated: nitrophenols, nitrobenzaldehydes and nitrobenzoic acids. The PSsat values were converted to subcooled liquid saturation vapour pressure (PLsat) values using experimental enthalpy of fusion and melting point values measured using differential scanning calorimetry (DSC). The PLsat values were compared to those estimated by predictive techniques and, with a few exceptions, were found to be up to 7 orders of magnitude lower. The large differences between the estimated PLsat and the experimental values can be attributed to the predictive techniques not containing parameters to adequately account for functional group positioning around an aromatic ring, or the interactions between said groups. When comparing the experimental PSsat of the measured compounds, the ability to hydrogen bond (H bond) and the strength of the H bond formed appear to have the strongest influence on the magnitude of the Psat, with steric effects and molecular weight also being major factors. Comparisons were made between the KEMS system and data from diffusion-controlled evaporation rates of single particles in an electrodynamic balance (EDB). The KEMS and the EDB showed good agreement with each other for the compounds investigated.

The Determination of Thermodynamic Properties of melts from the Cu-Si-System by Mass Spectrometry

1981 ◽  
Vol 36 (5) ◽  
pp. 447-453 ◽  
Author(s):  
G. Riekert ◽  
P. Lamparter ◽  
S. Steeb
Keyword(s):  
Mass Spectrometry ◽  
Thermodynamic Properties ◽  
Composition Range ◽  
Entire Composition Range ◽  
Knudsen Effusion ◽  
Gibbs Energies ◽  
Thermodynamic Activities ◽  
Excess Gibbs Energies ◽  
Knudsen Effusion Technique

Abstract The Knudsen effusion technique combined with mass spectrometry has been applied to determine thermodynamic activities and excess Gibbs energies for the liquid Cu-Si System. The system shows a tendency for segregation over the entire composition range. Special features in the partial and integral properties could be interpreted by means of two models.

Sign in / Sign up

Export Citation Format

Share Document