Particle charge-size distribution measurement using a differential mobility analyzer and an electrical low pressure impactor. Issue 1 (2nd January 2017)

• Record Type: Journal Article
• Authors: Järvinen, A.; Heikkilä, P.; Keskinen, J.; Yli-Ojanperä, J.
• Is Part Of: Aerosol science and technology. Volume 51:Issue 1(2017)
• Page Start: 20
• Page End: 29
• Publication Date: 2017-01-02
• Subjects: Jing Wang; Aerosols -- Periodicals; Aerosol Propellants -- Periodicals; Aerosols -- Periodicals; 660.294515
• DOI: 10.1080/02786826.2016.1256469
• Languages: English
• ISSNs: 0278-6826

Abstract

ABSTRACT: We introduce a particle charge-size distribution measurement method using a differential mobility analyzer and an electrical low pressure impactor in tandem configuration. The main advantage of this type of measurement is that it is suitable for a wide range of particle sizes, from approximately 30 nm up to a micrometer, and for high charge levels, which have been problematic for previously used methods. The developed charge measurement method requires information on the particle effective density, and the accuracy of the measurement is dependent on how well the particle effective density is known or estimated. We introduce the measurement and calculation procedures and test these in laboratory conditions. The developed method has been tested using narrow and wide particle size distributions of a known density and well-defined particle charging states. The particles have been produced by the Singly Charged Aerosol Reference (SCAR) and an atomizer and charged with the previously well-characterized unipolar diffusion chargers used in the Nanoparticle Surface Area Monitor (NSAM) and in the Electrical Low Pressure Impactor (ELPI+). The acquired charge-size distributions are in good agreement with the reference values in terms of the median charge levels and widths of the charge distributions. Copyright © 2017 American Association for Aerosol Research