Sampling nanoparticles for chemical analysis by low resolution electrical mobility classification

Peter H McMurry; Ajaya Ghimire; Hyo Kueh Ahn; Hiromu Sakurai; Katharine Moore; Mark R Stolzenburg; James N. Smith

doi:10.1021/es8029335

Sampling nanoparticles for chemical analysis by low resolution electrical mobility classification

Peter H McMurry, Ajaya Ghimire, Hyo Kueh Ahn, Hiromu Sakurai, Katharine Moore, Mark R Stolzenburg, James N. Smith

Mechanical Engineering

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41 Scopus citations

Abstract

The use of electrostatic classification to collect samples of aerosol nanoparticles for chemical analysis is discussed. Our technique exposes the aerosol to negative ions in a unipolar charger with subsequent mobility classification at low resolution and high sampling rate. The negative unipolar charger produces high charged fractions. The low-resolution mobility classifier enables the delivery of high mass concentrations in a well-defined mobility range. The mobility-classified particles are collected by electrostatic precipitation. We summarize experimental and computational work on the performance of the unipolar charger, and we describe the performance of the overall system when used to sample atmospheric particles. For a size distribution measured in Atlanta during a new particle formation event, calculated mass sampling rates of ∼8 nm particles were about 150 pg/h.

Original language	English (US)
Pages (from-to)	4653-4658
Number of pages	6
Journal	Environmental Science and Technology
Volume	43
Issue number	13
DOIs	https://doi.org/10.1021/es8029335
State	Published - Jul 1 2009

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AU - McMurry, Peter H

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AU - Ahn, Hyo Kueh

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AU - Moore, Katharine

AU - Stolzenburg, Mark R

AU - Smith, James N.

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AB - The use of electrostatic classification to collect samples of aerosol nanoparticles for chemical analysis is discussed. Our technique exposes the aerosol to negative ions in a unipolar charger with subsequent mobility classification at low resolution and high sampling rate. The negative unipolar charger produces high charged fractions. The low-resolution mobility classifier enables the delivery of high mass concentrations in a well-defined mobility range. The mobility-classified particles are collected by electrostatic precipitation. We summarize experimental and computational work on the performance of the unipolar charger, and we describe the performance of the overall system when used to sample atmospheric particles. For a size distribution measured in Atlanta during a new particle formation event, calculated mass sampling rates of ∼8 nm particles were about 150 pg/h.

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Sampling nanoparticles for chemical analysis by low resolution electrical mobility classification

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