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It is shown that thermophoresis of ultrafine and nanosized particles can be calculated using an ideal gas model in a single-velocity Clausius approximation. An application of the classical approach allows determining the particle velocity and the force generated by the gas phase in the case where a temperature gradient is present in it. A good agreement with the available experimental data is obtained.
The coefficients of mechanical resistance to motion of carbon nanoparticles (graphenes, nanotubes, and fullerenes) are theoretically determined. The average velocity of their motion in an annular gas flow rotating at a constant angular velocity is calculated. The results are obtained within the ideal gas model.
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