Volatility Study of Amino Acids by Knudsen Effusion with QCM Mass Loss Detection.

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ID: 103096
2020
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Ranked #7 of 22 articles by views in Chemphyschem : a European journal of chemical physics and physical chemistry

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Abstract
This work presents a new Knudsen effusion apparatus employing continuous monitoring of sample deposition using a quartz-crystal microbalance sensor with internal calibration by gravimetric determination of the sample mass loss. The apparatus was tested with anthracene and 1,3,5-triphenylbenzene and subsequently used for the study of sublimation behavior of several proteinogenic amino acids. Their low volatility and thermal instability strongly limit possibilities of studying their sublimation behavior and available literature data. The results presented in this work are unique in their temperature range and low uncertainty required for benchmarking theoretical studies of sublimation behavior of molecular crystals. The possibility of dimerization in the gas phase that would invalidate the effusion experiments is addressed and disproved by theoretical calculations. The enthalpy of sublimation of each amino acid is analyzed based on the contributions in two hypothetical sublimation paths involving the proton transfer in the solid and in the gas phase.
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tejfa2020volatilitychemphyschem Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Štejfa, Vojtěch;Pokorný, Václav;Miranda, Carlos F P;Fernandes, Óscar O P;Santos, Luís M N B F;
Journal Chemphyschem : a European journal of chemical physics and physical chemistry
Year 2020
DOI
10.1002/cphc.202000078
URL
Keywords
amino acids thermodynamics phase transitions knudsen effusion sublimation enthalpies

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