Solvation enthalpies and heat capacities of n-alkanes in four polymer phases by capillary gas chromatography

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Abstract

Molar solvation enthalpy (Δsol H298 o) and molar heat capacity changes (Δsol Cpo) were determined by gas chromatography for the C6-C12 n-alkanes on four preferred stationary phases (100% polydimethyl siloxane, 50% diphenyl-50% dimethyl polysiloxane, 50% trifluoropropyl methylsiloxane, and polyethylene glycol) in commercial FSOT. Statistical evaluation indicated the temperature independence of Δsol Cpo in the range 303-393 K. Δsol H298o depends linearly on the number of carbon atoms in the n-alkanes, but no linearity could be established for Δsol Cpo of higher homologues on polar columns, which may be due to a more ordered state on the liquid phase. The homologues for which a linear temperature dependence exists demonstrated that Δsol Cpo is related linearly to the van der Waals volume and the temperature derivative of the density of the stationary phase. The results are consistent with a simple physical explanation at the molecular level.

Original languageEnglish
Pages (from-to)506-512
Number of pages7
JournalJournal of Separation Science
Volume28
Issue number6
DOIs
Publication statusPublished - Apr 2005

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Alkanes
Solvation
Polymethyl Methacrylate
Sols
Gas chromatography
Gas Chromatography
Paraffins
Specific heat
Enthalpy
Polymers
Hot Temperature
Temperature
Siloxanes
Silicones
Carbon
Polyethylene glycols
Derivatives
Atoms
Liquids

Keywords

  • Enthalpy of solution
  • Gas chromatography
  • Solvation molar heat capacity
  • Solvation thermodynamics
  • Stationary phases

ASJC Scopus subject areas

  • Molecular Medicine
  • Clinical Biochemistry
  • Chemical Engineering(all)
  • Filtration and Separation

Cite this

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title = "Solvation enthalpies and heat capacities of n-alkanes in four polymer phases by capillary gas chromatography",
abstract = "Molar solvation enthalpy (Δsol H298 o) and molar heat capacity changes (Δsol Cpo) were determined by gas chromatography for the C6-C12 n-alkanes on four preferred stationary phases (100{\%} polydimethyl siloxane, 50{\%} diphenyl-50{\%} dimethyl polysiloxane, 50{\%} trifluoropropyl methylsiloxane, and polyethylene glycol) in commercial FSOT. Statistical evaluation indicated the temperature independence of Δsol Cpo in the range 303-393 K. Δsol H298o depends linearly on the number of carbon atoms in the n-alkanes, but no linearity could be established for Δsol Cpo of higher homologues on polar columns, which may be due to a more ordered state on the liquid phase. The homologues for which a linear temperature dependence exists demonstrated that Δsol Cpo is related linearly to the van der Waals volume and the temperature derivative of the density of the stationary phase. The results are consistent with a simple physical explanation at the molecular level.",
keywords = "Enthalpy of solution, Gas chromatography, Solvation molar heat capacity, Solvation thermodynamics, Stationary phases",
author = "M. G{\"o}rg{\'e}nyi and K. Heberger",
year = "2005",
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pages = "506--512",
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TY - JOUR

T1 - Solvation enthalpies and heat capacities of n-alkanes in four polymer phases by capillary gas chromatography

AU - Görgényi, M.

AU - Heberger, K.

PY - 2005/4

Y1 - 2005/4

N2 - Molar solvation enthalpy (Δsol H298 o) and molar heat capacity changes (Δsol Cpo) were determined by gas chromatography for the C6-C12 n-alkanes on four preferred stationary phases (100% polydimethyl siloxane, 50% diphenyl-50% dimethyl polysiloxane, 50% trifluoropropyl methylsiloxane, and polyethylene glycol) in commercial FSOT. Statistical evaluation indicated the temperature independence of Δsol Cpo in the range 303-393 K. Δsol H298o depends linearly on the number of carbon atoms in the n-alkanes, but no linearity could be established for Δsol Cpo of higher homologues on polar columns, which may be due to a more ordered state on the liquid phase. The homologues for which a linear temperature dependence exists demonstrated that Δsol Cpo is related linearly to the van der Waals volume and the temperature derivative of the density of the stationary phase. The results are consistent with a simple physical explanation at the molecular level.

AB - Molar solvation enthalpy (Δsol H298 o) and molar heat capacity changes (Δsol Cpo) were determined by gas chromatography for the C6-C12 n-alkanes on four preferred stationary phases (100% polydimethyl siloxane, 50% diphenyl-50% dimethyl polysiloxane, 50% trifluoropropyl methylsiloxane, and polyethylene glycol) in commercial FSOT. Statistical evaluation indicated the temperature independence of Δsol Cpo in the range 303-393 K. Δsol H298o depends linearly on the number of carbon atoms in the n-alkanes, but no linearity could be established for Δsol Cpo of higher homologues on polar columns, which may be due to a more ordered state on the liquid phase. The homologues for which a linear temperature dependence exists demonstrated that Δsol Cpo is related linearly to the van der Waals volume and the temperature derivative of the density of the stationary phase. The results are consistent with a simple physical explanation at the molecular level.

KW - Enthalpy of solution

KW - Gas chromatography

KW - Solvation molar heat capacity

KW - Solvation thermodynamics

KW - Stationary phases

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