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Title: Electrical Mobility Spectrometer Using a Diethylene Glycol Condensation Particle Counter for Measurement of Aerosol Size Distributions Down to 1 nm

Abstract

We report a new scanning mobility particle spectrometer (SMPS) for measuring number size distributions of particles down to {approx}1 nm mobility diameter. This SMPS includes an aerosol charger, a TSI 3085 nano differential mobility analyzer (nanoDMA), an ultrafine condensation particle counter (UCPC) using diethylene glycol (DEG) as the working fluid, and a conventional butanol CPC (the 'booster') to detect the small droplets leaving the DEG UCPC. The response of the DEG UCPC to negatively charged sodium chloride particles with mobility diameters ranging from 1-6 nm was measured. The sensitivity of the DEG UCPC to particle composition was also studied by comparing its response to positively charged 1.47 and 1.70 nm tetra-alkyl ammonium ions, sodium chloride, and silver particles. A high resolution differential mobility analyzer was used to generate the test particles. These results show that the response of this UCPC to sub-2 nm particles is sensitive to particle composition. The applicability of the new SMPS for atmospheric measurement was demonstrated during the Nucleation and Cloud Condensation Nuclei (NCCN) field campaign (Atlanta, Georgia, summer 2009). We operated the instrument at saturator and condenser temperatures that allowed the efficient detection of sodium chloride particles but not of air ions having the samemore » mobility. We found that particles as small as 1 nm were detected during nucleation events but not at other times. Factors affecting size distribution measurements, including aerosol charging in the 1-10 nm size range, are discussed. For the charger used in this study, bipolar charging was found to be more effective for sub-2 nm particles than unipolar charging. No ion induced nucleation inside the charger was observed during the NCCN campaign.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
DOE - OFFICE OF SCIENCE
OSTI Identifier:
1020904
Report Number(s):
BNL-94767-2011-JA
Journal ID: ISSN 0278-6826; ASTYDQ; R&D Project: 2012-BNL-EE630EECA-BUDG; KP1701000; TRN: US1103887
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Aerosol Science and Technology
Additional Journal Information:
Journal Volume: 45; Journal ID: ISSN 0278-6826
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AEROSOLS; AIR; ATLANTA; BUTANOLS; CLOUDS; CONDENSATION NUCLEI; DETECTION; DISTRIBUTION; GEORGIA; GLYCOLS; NUCLEATION; RESOLUTION; SENSITIVITY; SILVER; SODIUM CHLORIDES; SPECTROMETERS; TEST PARTICLES; WORKING FLUIDS

Citation Formats

Jiang, J, Kuang, C, Chen, M, Attoui, M, and McMurry, P H. Electrical Mobility Spectrometer Using a Diethylene Glycol Condensation Particle Counter for Measurement of Aerosol Size Distributions Down to 1 nm. United States: N. p., 2011. Web. doi:10.1080/02786826.2010.547538.
Jiang, J, Kuang, C, Chen, M, Attoui, M, & McMurry, P H. Electrical Mobility Spectrometer Using a Diethylene Glycol Condensation Particle Counter for Measurement of Aerosol Size Distributions Down to 1 nm. United States. doi:10.1080/02786826.2010.547538.
Jiang, J, Kuang, C, Chen, M, Attoui, M, and McMurry, P H. Tue . "Electrical Mobility Spectrometer Using a Diethylene Glycol Condensation Particle Counter for Measurement of Aerosol Size Distributions Down to 1 nm". United States. doi:10.1080/02786826.2010.547538.
@article{osti_1020904,
title = {Electrical Mobility Spectrometer Using a Diethylene Glycol Condensation Particle Counter for Measurement of Aerosol Size Distributions Down to 1 nm},
author = {Jiang, J and Kuang, C and Chen, M and Attoui, M and McMurry, P H},
abstractNote = {We report a new scanning mobility particle spectrometer (SMPS) for measuring number size distributions of particles down to {approx}1 nm mobility diameter. This SMPS includes an aerosol charger, a TSI 3085 nano differential mobility analyzer (nanoDMA), an ultrafine condensation particle counter (UCPC) using diethylene glycol (DEG) as the working fluid, and a conventional butanol CPC (the 'booster') to detect the small droplets leaving the DEG UCPC. The response of the DEG UCPC to negatively charged sodium chloride particles with mobility diameters ranging from 1-6 nm was measured. The sensitivity of the DEG UCPC to particle composition was also studied by comparing its response to positively charged 1.47 and 1.70 nm tetra-alkyl ammonium ions, sodium chloride, and silver particles. A high resolution differential mobility analyzer was used to generate the test particles. These results show that the response of this UCPC to sub-2 nm particles is sensitive to particle composition. The applicability of the new SMPS for atmospheric measurement was demonstrated during the Nucleation and Cloud Condensation Nuclei (NCCN) field campaign (Atlanta, Georgia, summer 2009). We operated the instrument at saturator and condenser temperatures that allowed the efficient detection of sodium chloride particles but not of air ions having the same mobility. We found that particles as small as 1 nm were detected during nucleation events but not at other times. Factors affecting size distribution measurements, including aerosol charging in the 1-10 nm size range, are discussed. For the charger used in this study, bipolar charging was found to be more effective for sub-2 nm particles than unipolar charging. No ion induced nucleation inside the charger was observed during the NCCN campaign.},
doi = {10.1080/02786826.2010.547538},
journal = {Aerosol Science and Technology},
issn = {0278-6826},
number = ,
volume = 45,
place = {United States},
year = {2011},
month = {2}
}