Abstract
A novel piezoelectric plasma generator developed by TDK Electronics GmbH & Co. OG, the CeraPlas®, was investigated for its feasibility as a charger for aerosol particles. The CeraPlas® charger was directly compared to a commercially available bipolar X-ray charger regarding its efficiency of charging atomized NaCl particles in a size range from 30 nm to 100 nm. First results show the ability of the CeraPlas® to perform bipolar aerosol charging with high reproducibility, and measurements of the charge distribution in the Nit product yielded about 1012 m−3 s for our experimental charging configuration. Unwanted generation of ozone was suppressed by a dedicated charging chamber and operation in N2 atmosphere.
Highlights
Aerosols have existed for all of human history
An especially common one is the electrical mobility diameter, which assigns electrical mobility of a sphere to the considered particle. It is utilized in the differential mobility analyzer (DMA), where aerosol particles are classified by balancing the electrical force and the aerodynamic drag force [1]
In order to check for unwanted particle generation by the CeraPlas, SMPS scans with a HEPA filter upstream the charging chamber were performed with the CeraPlas alternately turned on and off
Summary
Besides the popular example of air pollution, aerosols have always existed in nature to a greater degree than than most people are aware They are part of our everyday life, from cloud formation to the spread of pandemics by airborne infections, to smoke and dust. An especially common one is the electrical mobility diameter, which assigns electrical mobility of a sphere to the considered particle It is utilized in the differential mobility analyzer (DMA), where aerosol particles are classified by balancing the electrical force and the aerodynamic drag force [1]. Common commercially available devices are include 85 Kr (TSI 3077) and X-ray (TSI 3088) chargers These chargers are well characterized and impart a known size-dependent equilibrium charge distribution on the particles, which can be approximated by analytical formulas [1,2]. The charging behavior of neutralizers is standardized in ISO 15900 [3]
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