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Thermophoretic Forces on Nanoparticles in Dilute Binary Gas Mixtures

Jun Wang  Zhigang Li  
【摘要】:正The nanoparticle transport and thermophoresis in dilute binary monoatomic gas mixtures is theoretically investigated based on the gas kinetic theory.By considering the gas-particle van der Waals interactions,we derive the thermophoretic forces on nanoparticles.The analytical formulas are consistent with those in simple gases.It is found that the thermophoretic forces on nanoparticles by taking into account the gas-particle van der Waals interaction are substantially different from the prediction given by the rigid-body collision.For certain conditions,it is predicted that the negative thermophoresis,by which the nanoparticles migrate from low to high temperature,is available in the free molecule regime.

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