METHOD AND SYSTEM FOR SIGNIFICANTLY IMPROVING CHARGE PROBABILITIES OF NANOMETER AEROSOL PARTICLES

摘要

The various embodiments described herein significantly increase charge probabilities of nanoparticles by first growing them to larger droplets using a diethylene glycol-based preconditioner, neutralizing the droplets with a bipolar charger, and then removing the condensed liquid to recover the original aerosol particles. The small droplet size is an important element in reducing the amount of aerosol particles with more than one charge. The high single-charge particle probability significantly enhances the monodisperse aerosol throughput of a DMA, while the reduced multiple charge probabilities ensure high monodispersity of DMA-classified aerosols and good data quality of SMPS measurements.

主权项

1. A nanoparticle measurement system comprising:
a nanoparticle charger apparatus configured to receive a nanoparticle laden flow and to grow the particles using a working fluid comprised of a fluid having a high surface tension and a low vapor pressure, the charger apparatus further configured to charge the grown particles before drying the particles; a differential mobility analyzer operatively coupled to said nanoparticle charger apparatus and adapted to receive and separate the charged nanoparticles; and an aerosol detector device operatively coupled to the mobility analyzer and adapted to conduct particle monitoring.