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This article is cited in 2 scientific papers (total in 2 papers)
Graphenes
Thermophoresis of monatomic particles in open nanotubes
A. V. Savina, O. I. Savinab a N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
b Plekhanov Russian State University of Economics, Moscow, Russia
Abstract:
Using the method of molecular dynamics, it is shown that thermophoresis of particles (atoms) inside single-walled carbon nanotubes (CNTs) is highly efficient. Placing a particle inside the CNT involved in heat transfer causes it to move in the direction of the heat flow at a constant speed, the value of which weakly depends on the length of the nanotube. The heat flow along the CNT leads to the formation of a constant thermophoresis force for the particles inside. The direction of this force coincides with the direction of heat transfer. The monatomic nature of the particle allowed us to numerically calculate this force and to determine the contribution to this force of interaction with each thermal phonon of the nanotube. It is shown that the magnitude of the force is almost completely determined by the interaction of the particle with long-wave bending phonons of the nanotube, which have a long free run path. Therefore, the speed of the particle movement and the value of the thermophoresis force depend weakly on the length of the nanotube, but are determined by the temperature difference at its ends. Because of this, the mode of thermophoresis of particles inside nanotubes is ballistic, not diffusive.
Keywords:
nanotubes, thermophoresis, heat transfer, nanotube phonons.
Received: 16.11.2020 Revised: 16.11.2020 Accepted: 20.11.2020
Citation:
A. V. Savin, O. I. Savina, “Thermophoresis of monatomic particles in open nanotubes”, Fizika Tverdogo Tela, 63:4 (2021), 564–571; Phys. Solid State, 63:5 (2021), 811–818
Linking options:
https://www.mathnet.ru/eng/ftt8159 https://www.mathnet.ru/eng/ftt/v63/i4/p564
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