A quartz crystal microbalance to determine enthalpies of sublimation at intermediate temperatures by the Knudsen effusion method

1994 ◽  
Vol 5 (1) ◽  
pp. 51-54 ◽  
Author(s):  
L A Torres ◽  
I Hernandez-Contreras ◽  
J A Guardado ◽  
M G Gonzalez
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
Enthalpies Of Sublimation ◽  
Effusion Method

Microwave-assisted synthesis and sublimation enthalpies of hemiporphyrazines

2019 ◽  
Vol 23 (03) ◽  
pp. 296-302 ◽  
Author(s):  
Aleksandra S. Kuznetsova ◽  
Nadezhda L. Pechnikova ◽  
Yuriy A. Zhabanov ◽  
Aleksey E. Khochenkov ◽  
Oscar I. Koifman ◽  
...  
Keyword(s):  
Second Law Of Thermodynamics ◽  
Mass Spectrometric ◽  
Microwave Assisted Synthesis ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
High Yields ◽  
Time Required ◽  
Enthalpies Of Sublimation ◽  
Effusion Method ◽  
C Nmr

It was established that microwave irradiation solvent-free processing of 2,6- diaminopyridine or 1,3-phenylenediamine with phthalonitrile or 4-tert-butylphthalonitrile led to corresponding hemiporphyrazines with sufficiently high yields and a huge reduction in the time required for synthesis, from 8–12 h to 20 min. The data of IR and UV-vis spectroscopies and elemental analysis of the final products were found to be similar to those described in literature. The obtained hemiporphyrazines were characterized by 1H and [Formula: see text]C NMR data. We applied the Knudsen effusion method with mass spectrometric control of vapor composition. The mass spectrometric investigations established that the macrocyclic compounds give a stable stream of particles and their enthalpies of sublimation were estimated by the second law of thermodynamics.

Study of thermal stability of n-type skutterudites Sr0.07Ba0.07Yb0.07Co4Sb12 by differential thermal analysis and Knudsen effusion method

Calphad ◽  
2021 ◽  
Vol 73 ◽  
pp. 102258
Author(s):  
František Zelenka ◽  
Jakub Strádal ◽  
Pavel Brož ◽  
Jan Vřešťál ◽  
Jiří Buršík ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
Effusion Method ◽  
Thermal Stability Of

Development of the Knudsen effusion methodology for vapour pressure measurements of low volatile liquids and solids based on a quartz crystal microbalance

2018 ◽  
Vol 126 ◽  
pp. 171-186 ◽  
Author(s):  
Luís M.N.B.F. Santos ◽  
Ana I.M.C. Lobo Ferreira ◽  
Vojtech Štejfa ◽  
Ana S.M.C. Rodrigues ◽  
Marisa A.A. Rocha ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Vapour Pressure ◽  
Quartz Crystal ◽  
Pressure Measurements ◽  
Knudsen Effusion ◽  
Volatile Liquids
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