The heat capacity of 1D chains of methane molecules in the outer grooves bundles of carbon nanotubes

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

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 languageEnglish
Pages (from-to)128-133
Number of pages6
JournalFizika Nizkikh Temperatur
Volume42
Issue number2
Publication statusPublished - 1 Feb 2016

Fingerprint

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

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 journalArticle

@article{4833762e1d4945918b12cfda2997bc10,
title = "The heat capacity of 1D chains of methane molecules in the outer grooves bundles of carbon nanotubes",
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.",
keywords = "1d chain, Heat capacity of low-dimensional systems, Rotational heat capacity, The heat capacity of one-dimensional molecular chains. low",
author = "Bagatskii, {M. I.} and Sumarokov, {V. V.} and Barabashko, {M. S.}",
year = "2016",
month = "2",
day = "1",
language = "English",
volume = "42",
pages = "128--133",
journal = "Soviet Journal of Low Temperature Physics (English Translation of Fizika Nizkikh Temperatur)",
issn = "0132-6414",
publisher = "American Institute of Physics Publising LLC",
number = "2",

}

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

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 -