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arXiv 1805.06409physics.plasm-ph
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动态等离子体中纳米粒子的生长

Nanoparticles growth in dynamic plasma

V. Vekselman, M. N. Shneider, Y. Raitses

摘要:

纳米粒子在等离子体中的凝聚生长动力学受粒子间由于带电现象而产生的静电力的影响。在静止等离子体中,颗粒的单极充电导致颗粒生长的延迟,并且可能导致对颗粒尺寸的限制。我们证明了相反的效果,在大气压非稳态电弧放电增强颗粒生长。纳米颗粒生长动力学模型揭示了双极性电荷分布的形成。结果,如实验中所观察到的,反向(吸引)库仑力在毫秒时间尺度内促进微米尺寸颗粒的形成。

英文摘要:

Coagulation growth kinetics of nanoparticles in plasma is affected by inter-particle electrostatic forces due to charging phenomenon. In stationary plasmas, unipolar charging of particles results in retardation of particles growth and may result in limitation on a particle size. We demonstrate opposite effect of enhanced particles growth in atmospheric pressure non-stationary arc discharge. Modeling of the nanoparticles growth kinetics revealed the formation of bipolar charge distribution. As a result, reversed (attractive) Coulomb forces promote formation of micrometer size particles in a millisecond time scale as observed in experiment.

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