10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Aerosol Charge Conditioning and the Characterization of a New Soft X-ray Charger
FREDERIK WEIS, Mara Pfeffinger, Maximilian Weiss, Palas GmbH
Abstract Number: 1686 Working Group: Instrumentation
Abstract Prerequisite for the measurement of particle size distributions of an aerosol by differential mobility analyzer systems (DMAS) is the establishment of a known charge distribution. Soft X-ray chargers can offer an alternative to traditionally used radioactive neutralizers, which suffer from strict legislative handling and operation regulations. In this work, a new soft X-ray charger was developed and the performance was evaluated in comparison to a radioactive 85Kr source and with respect to the ongoing development of ISO standard 19996. Different aerosol generators were used to produce liquid and solid test aerosols with different pre-charge levels, as well as ambient air monitoring was investigated. In order to evaluate the aerosol charge distribution a new DEMC control unit incorporating two high voltage modules (positive and negative) was developed. By using two identical classifier columns and condensation particle counters the differences in the charged aerosol fractions can be directly monitored and characterized. The results will be discussed in comparisons to the bipolar diffusion theory and known particle charge distributions of other soft x-ray chargers.