Thermal vacancies in one-dimensional Xe adsorbate chains in grooves of nanotube bundles

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

doi:10.1134/s0021364014080049

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…The plates were obtained by compacting the MWCNTs powder under the pressure of 1.1 GPa as in Ref. 28.…”

Section: Methodsmentioning

confidence: 99%

“…25). Adsorbed Xe, N 2 , and CH 4 impurities lead to a significant increase in the specific heat of bundles of closed single-wall carbon nanotubes at low temperatures [26][27][28][29][30]. For example, the concentration of several admixture nitrogen molecules per 1000 carbon atoms in bundles of singlewalled carbon nanotubes leads to an increase in the specific heat by a factor of 1.5 at ~ 2 K. Thus, thorough cleaning of samples from gas impurities is an integral part of obtaining precision data on the heat capacity of carbon nanomaterials.…”

Section: The Low-temperature Specific Heat Of Mwcntsmentioning

confidence: 99%

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The low-temperature specific heat of MWCNTs

Sumarokov

Jeżowski

Szewczyk

et al. 2019

Low Temperature Physics

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The specific heat of multi-walled carbon nanotubes (MWCNTs) with a low defectiveness and with a low content of inorganic impurities has been measured in the temperature range from 1.8 to 275 K by the thermal relaxation method. The elemental composition and morphology of the MWCNTs were determined using scanning electron microscopy analysis and energy dispersion x-ray spectroscopy. The MWCNTs were prepared by chemical catalytic vapor deposition and have mean diameters from 7 nm up to 18 nm and lengths in some tens of microns. MWCNTs purity is over 99.4 at.%. The mass of the samples ranged from 2-4 mg. It was found that the temperature dependence of the specific heat of the MWCNTs differs significantly from other carbon materials (graphene, bundles of SWCNTs, graphite, diamond) at low temperatures. The specific heat of MWCNTs systematically decreases with increasing diameter of the tubes at low temperatures. The character of the temperature dependence of the specific heat of the MWCNTs with different diameters demonstrates the manifestation of different dimensions from 1D to 3D, depending on the temperature regions. The crossover temperatures are about 6 and 40 K. In the vicinity of these temperatures, a hysteresis is observed.

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“…The plates were obtained by compacting the MWCNTs powder under the pressure of 1.1 GPa as in Ref. 28.…”

Section: Methodsmentioning

confidence: 99%

Section: The Low-temperature Specific Heat Of Mwcntsmentioning

confidence: 99%

The low-temperature specific heat of MWCNTs

Sumarokov

Jeżowski

Szewczyk

et al. 2019

Low Temperature Physics

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“…For the chains of this length, the boundary effects can be neglected. The one-dimensional nature of these structures is confirmed by both neutrondiffraction studies [2] and heat capacity data [3][4][5][6][7]. Neutron diffraction studies of 4 He atoms adsorbed in grooves on the nanobundle surface have shown the periodicity of the arrangement of 4 He atoms in the chain [9].…”

Section: Introductionmentioning

confidence: 73%

“…Recently the adsorption of rare-gas atoms onto carbon nanotube bundles is often used to obtain stable macroscopically long q1D structures [2][3][4][5][6][7][8]. In the grooves between the nanotubes, the adsorbed atoms can form linear chains of length ~ 10 μm.…”

Section: Introductionmentioning

confidence: 99%

Phonon spectra and vibrational heat capacity of quasi-one-dimensional structures formed by rare gas atoms on the surface of carbon nanotube bundles

Manzhelii

Feodosyev

Gospodarev

2019

Low Temperature Physics

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The features of phonon spectra and their effect on the vibrational heat capacity of linear chains of inert gas atoms adsorbed onto a substrate, which is the surface of nanotubes bound to a nanobundle. The influence of the substrate results both in a shift of the lower limit of the chain spectrum from zero, and in mechanical stress in the chain (its extension or compression) also. It is shown that in the case of a compressed chain, the non-central interaction between atoms is negative (repulsive), it results in a shift of the lower boundary of the spectrum of transverse vibrations to low frequencies and to a shortening of the part of the specific heat temperature dependence in which this dependence is close to exponential. Heterogeneity of the nanobundle structure can cause a change in the distances between atoms of the chain. It is shown both and analytically and numerically, that as a result of it, discrete levels with frequencies both above and below the quasi-continuous spectrum band can appear in the phonon spectrum of the chain. The discrete levels with frequencies below the quasi-continuous spectrum band lead to a further shortening of the temperature interval at which the temperature dependence of the specific heat is close to the exponential one.

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“…Voronel and coworkers discovered more than 50 years ago that the isochoric heat capacity of argon diverges at the critical point [16,17]. This divergence has been subsequently confirmed for other fluids.…”

mentioning

confidence: 85%

Comment on Gibbs Density Surface of Fluid Argon, L.V. Woodcock, Int. J. Thermophys. (2014) 35:1770–1784

Sengers

Анисимов

2015

Int J Thermophys

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It has been established experimentally that the thermodynamic properties of fluids satisfy scaling laws with universal critical exponents asymptotically close to a single critical point of the vapor-liquid phase transition. In contrast to the conjecture of Woodcock, there is no reliable experimental evidence to doubt the existence of such a single critical point in the thermodynamic limit and of the validity of the scaling theory for critical thermodynamic behavior.Keywords Argon · Compressibility · Critical point · Isochoric heat capacity · Vapor-liquid coexistence It has been well established that the thermodynamic properties of fluids satisfy scaling laws with universal critical exponents asymptotically close to the vapor-liquid critical point [1][2][3]. For instance, the isothermal susceptibility, (proportional to the isothermal compressibility κ T ), which is the derivative of the density ρ (order parameter) with respective to the chemical potential μ (ordering field) at constant temperature T , diverges strongly at the critical density ρ = ρ c asB J. V. Sengers

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Thermal vacancies in one-dimensional Xe adsorbate chains in grooves of nanotube bundles

Cited by 16 publications

References 26 publications

The low-temperature specific heat of MWCNTs

The low-temperature specific heat of MWCNTs

Phonon spectra and vibrational heat capacity of quasi-one-dimensional structures formed by rare gas atoms on the surface of carbon nanotube bundles

Comment on Gibbs Density Surface of Fluid Argon, L.V. Woodcock, Int. J. Thermophys. (2014) 35:1770–1784

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