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

97 Citations (Scopus)

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 - 2007

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dielectric polarization
Polarization
Specific heat
polarization
Dielectric relaxation
specific heat
Hydrogen bonds
Electric fields
Alcohols
glass transition temperature
alcohols
Liquids
electric fields
2-ethylhexanol
hydrogen
liquids
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Comparing calorimetric and dielectric polarization modes in viscous 2-ethyl-1-hexanol. / Huth, Heiko; Wang, Li Min; Schick, Christoph; Richert, Ranko.

In: Journal of Chemical Physics, Vol. 126, No. 10, 104503, 2007.

Research output: Contribution to journalArticle

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