Abstract
The heat capacity at constant pressure CP of 1D chains of methane molecules adsorbed into the grooves on the outer surface of the bundles of closed single-walled nanotubes has been measured in the temperature range from 2 to 60 K for the first time. Character of the temperature dependence of CP below 12 K indicates on the presence of Schottky anomaly caused by the tunneling between the lowest energy levels of rotational spectra of A, T, and E-nuclear spin modifications of the methane molecules. Special feature is observed in the area of 14 K, apparently, due to orientational phase transition, in which the nature of the rotational motion of the molecules varies from libration to hindered rotation. It is found that the value of the rotational heat capacity is close to the case of free rotation of the methane molecules in the temperature range of 30-40 K. The increase in derivative dCP(T) / dT above 40 K and peculiarity in the CP(T) near 52 K are due to the processes of decay of 1D chains of CH4. PACS: 65.40.Ba Heat capacity; 65.80.-g Thermal properties of small particles, nanocrystals, nanotubes and other related systems; 68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: Structure and nonelectronic properties; 81.07.De Nanotubes.copy;M.I. Bagatskii, V.V. Sumarokov,and M.S. Barabashko,2016.
| Original language | English |
|---|---|
| Pages (from-to) | 128-133 |
| Number of pages | 6 |
| Journal | Fizika Nizkikh Temperatur |
| Volume | 42 |
| Issue number | 2 |
| Publication status | Published - 1 Feb 2016 |
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Keywords
- 1d chain
- Heat capacity of low-dimensional systems
- Rotational heat capacity
- The heat capacity of one-dimensional molecular chains. low
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
The heat capacity of 1D chains of methane molecules in the outer grooves bundles of carbon nanotubes. / Bagatskii, M. I.; Sumarokov, V. V.; Barabashko, M. S.
In: Fizika Nizkikh Temperatur, Vol. 42, No. 2, 01.02.2016, p. 128-133.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The heat capacity of 1D chains of methane molecules in the outer grooves bundles of carbon nanotubes
AU - Bagatskii, M. I.
AU - Sumarokov, V. V.
AU - Barabashko, M. S.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The heat capacity at constant pressure CP of 1D chains of methane molecules adsorbed into the grooves on the outer surface of the bundles of closed single-walled nanotubes has been measured in the temperature range from 2 to 60 K for the first time. Character of the temperature dependence of CP below 12 K indicates on the presence of Schottky anomaly caused by the tunneling between the lowest energy levels of rotational spectra of A, T, and E-nuclear spin modifications of the methane molecules. Special feature is observed in the area of 14 K, apparently, due to orientational phase transition, in which the nature of the rotational motion of the molecules varies from libration to hindered rotation. It is found that the value of the rotational heat capacity is close to the case of free rotation of the methane molecules in the temperature range of 30-40 K. The increase in derivative dCP(T) / dT above 40 K and peculiarity in the CP(T) near 52 K are due to the processes of decay of 1D chains of CH4. PACS: 65.40.Ba Heat capacity; 65.80.-g Thermal properties of small particles, nanocrystals, nanotubes and other related systems; 68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: Structure and nonelectronic properties; 81.07.De Nanotubes.copy;M.I. Bagatskii, V.V. Sumarokov,and M.S. Barabashko,2016.
AB - The heat capacity at constant pressure CP of 1D chains of methane molecules adsorbed into the grooves on the outer surface of the bundles of closed single-walled nanotubes has been measured in the temperature range from 2 to 60 K for the first time. Character of the temperature dependence of CP below 12 K indicates on the presence of Schottky anomaly caused by the tunneling between the lowest energy levels of rotational spectra of A, T, and E-nuclear spin modifications of the methane molecules. Special feature is observed in the area of 14 K, apparently, due to orientational phase transition, in which the nature of the rotational motion of the molecules varies from libration to hindered rotation. It is found that the value of the rotational heat capacity is close to the case of free rotation of the methane molecules in the temperature range of 30-40 K. The increase in derivative dCP(T) / dT above 40 K and peculiarity in the CP(T) near 52 K are due to the processes of decay of 1D chains of CH4. PACS: 65.40.Ba Heat capacity; 65.80.-g Thermal properties of small particles, nanocrystals, nanotubes and other related systems; 68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: Structure and nonelectronic properties; 81.07.De Nanotubes.copy;M.I. Bagatskii, V.V. Sumarokov,and M.S. Barabashko,2016.
KW - 1d chain
KW - Heat capacity of low-dimensional systems
KW - Rotational heat capacity
KW - The heat capacity of one-dimensional molecular chains. low
UR - http://www.scopus.com/inward/record.url?scp=84955161809&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84955161809&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84955161809
VL - 42
SP - 128
EP - 133
JO - Soviet Journal of Low Temperature Physics (English Translation of Fizika Nizkikh Temperatur)
JF - Soviet Journal of Low Temperature Physics (English Translation of Fizika Nizkikh Temperatur)
SN - 0132-6414
IS - 2
ER -