Comparing calorimetric and dielectric polarization modes in viscous 2-ethyl-1-hexanol

Heiko Huth, Li Min Wang, Christoph Schick, Ranko Richert

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

Dielectric relaxation and dynamic heat capacity measurements are compared for 2-ethyl-1-hexanol near its glass transition temperature Tg in order to further clarify the origin of the prominent Debye-type loss peak observed in many monohydroxy alcohols and other hydrogen-bonding liquids. While the dielectric spectrum ε″ displays two distinct polarization processes that are separated by a factor of 2000 in terms of the peak frequency, the heat capacity cp″ shows only a single peak. The dielectric process with lower amplitude and higher peak frequency coincides with the calorimetric signal, whereas the large dielectric Debye signal is not associated with calorimetric modes. The authors conclude that the Debye process corresponds to a transition among states which differ in energy only in the case of an external electric field.

Original languageEnglish (US)
Article number104503
JournalJournal of Chemical Physics
Volume126
Issue number10
DOIs
StatePublished - Mar 23 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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