Heat capacity of one-dimensional chains of methane molecules in the outer grooves of carbon nanotube bundles

M. I. Bagatskii, V. V. Sumarokov, M. S. Barabashko

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The heat capacity at constant pressure C P of 1D-chains of methane molecules adsorbed in the grooves on the outer surface of the bundles of closed single-walled nanotubes was measured in the temperature range from 2 to 60K for the first time. The behavior of the temperature dependence of C P below 12K indicates the presence of a Schottky-type anomaly originated from the tunneling between the lowest energy levels of the rotational spectra of the A, T, and E nuclear-spin species of methane molecules. The feature observed in the vicinity of 14K is presumably caused by an orientational phase transition, in which the nature of the rotational motion of the molecules changes from libration to hindered rotation. It was found that the rotational heat capacity in the temperature range of 30-40K is close to that of freely rotating methane molecules. An increase in the derivative dC P (T)/dT above 40K and the feature in the C P (T) near 52K are due to the decay of 1D chains of CH 4 .

Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalLow Temperature Physics
Volume42
Issue number2
DOIs
Publication statusPublished - 1 Feb 2016
Externally publishedYes

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grooves
bundles
methane
carbon nanotubes
specific heat
molecules
libration
rotational spectra
nuclear spin
nanotubes
energy levels
methylidyne
anomalies
temperature dependence
temperature
decay

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Heat capacity of one-dimensional chains of methane molecules in the outer grooves of carbon nanotube bundles. / Bagatskii, M. I.; Sumarokov, V. V.; Barabashko, M. S.

In: Low Temperature Physics, Vol. 42, No. 2, 01.02.2016, p. 94-98.

Research output: Contribution to journalArticle

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