动态等离子体中纳米颗粒的生长。

Growth of nanoparticles in dynamic plasma.

作者信息

Vekselman V, Raitses Y, Shneider M N

机构信息

Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA.

Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, USA.

出版信息

Phys Rev E. 2019 Jun;99(6-1):063205. doi: 10.1103/PhysRevE.99.063205.

DOI:10.1103/PhysRevE.99.063205

PMID:31330746

Abstract

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

摘要

由于充电现象，等离子体中纳米颗粒的凝聚生长动力学受到颗粒间静电力的影响。在静止等离子体中，颗粒的单极充电会导致颗粒生长迟缓，并可能限制颗粒尺寸。我们证明了在大气压非静止电弧放电中颗粒生长增强的相反效应。纳米颗粒生长动力学的建模揭示了双极电荷分布的形成。结果，如实验中所观察到的，反向（吸引性）库仑力在毫秒时间尺度上促进了微米级颗粒的形成。