Low Temperature Physics: 39, 441 (2013); https://doi.org/10.1063/1.4807048 (5 pages)
Физика Низких Температур: Том 39, Выпуск 5 (Май 2013), c. 568-573    ( к оглавлению , назад )

The heat capacity of nitrogen chain in grooves of single-walled carbon nanotube bundles

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

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: bagatskii@ilt.kharkov.ua

Received November 2, 2012

Аннотация

The heat capacity of bundles of closed-cap single-walled carbon nanotubes with one-dimensional chains of nitrogen molecules adsorbed in the grooves has been first experimentally studied at temperatures from 2 to 40 K using an adiabatic calorimeter. The contribution of nitrogen CN2 to the total heat capacity has been separated. In the region 28 K the behavior of the curve CN2(T) is qualitatively similar to the theoretical prediction of the phonon heat capacity of 1D chains of Kr atoms localized in the grooves of SWNT bundles. Below 3 K the de-pendence CN2(Т) is linear. Above 8 K the dependence CN2(Т) becomes steeper in comparison with the case of Kr atoms. This behavior of the heat capacity CN2(Т) is due to the contribution of the rotational degrees of free-dom of the N2 molecules.

PACS: 65.40.Ba Heat capacity;
PACS: 65.80.–g Thermal properties of small particles, nanocrystals, nanotubes, and other related systems;
PACS: 68.65.–k Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelec-tronic properties;
PACS: 81.07.De Nanotubes.

Ключевые слова: heat capacity, single-walled carbon nanotubes bundles, one-dimensional periodic phase of nitrogen molecules.