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Volume 83
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Volume 81
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Volume 80
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Volume 79
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Volume 78
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Volume 77
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Volume 76
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Volume 83
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Volumes 60-71 (2022)
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Volume 70
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Volume 68
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Volume 67
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Volume 65
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Volume 64
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Volume 63
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Volume 62
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Volume 61
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Volume 60
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Volume 71
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• Particle temperature effect on thermophoresis of nanoparticles is studied.
• Theoretical formulas for the thermophoresis on nanoparticles are obtained.
• Error due to equal gas–particle temperature assumption can be larger than 30%.
Aerosol particles suspended in a diluted gas with non-uniform temperature distribution are expected to experience a thermophoretic force. In theoretical treatment of thermophoresis, it is usually assumed that the particle temperature is equal to the surrounding gas temperature. However, this might not always be the case. In some particular applications, the particle temperature can significantly differ from the gas temperature. In the present paper, we theoretically investigate the effect of the particle temperature on the thermophoresis of nanoparticles in the free molecule regime. Theoretical formulas for the thermophoretic force and thermophoretic velocity are obtained based on the gas kinetic theory. As examples, a spherical Ag nanoparticle suspended in a dilute He gas is considered, and the Rudyak–Krasnolutski potential is employed to model the gas–particle interaction. It is found that the influence of the particle temperature on the thermophoresis of nanoparticles can be significant. With increasing particle size, the error due to the equal gas–particle temperature assumption can be neglected.