Densities of internally mixed organic-inorganic particles from mobility diameter measurements of aerodynamically classified aerosols
Abstract
Accurate knowledge of particle density is essential for many aspects of aerosol science. Yet, density is often characterized poorly and incompletely for internally mixed particles, particularly for dry particles, with previous studies focused primarily on deliquescent (aqueous) drop- lets. Instead, densities for dry internally mixed particles are often inferred from mass composition measurements in combination with predictive models assuming ideal mixing, with the accuracy of such models not estimated. We determined particle densities from mobility diameter measurements (using a Scanning Mobility Particle Sizer, SMPS) for dried particles classified by their aerodynamic size (using an Aerosol Aerodynamic Classifier, AAC) for a range of two-component organic-inorganic particles containing known proportions of organic and inorganic species. We examined all permutations of mixing between four different organic (water soluble nigrosin dye, citric acid, polyethylene glycol-400, and ascorbic acid) and three different inorganic (sodium chloride, ammonium sulfate, and sodium nitrate) species. The accuracy and precision in our measured particle densities were ~5% and ~1%, respectively, for nonvolatile particles. Substantial deviations in particle density from ideal mixing (up to 20%) were observed. We tested descriptions of the non-ideal mixing for our systems by representing the volume change of mixing using Redlich-Kister (RK) polynomials in terms ofmore »
- Authors:
-
[1];
[2];
[3];
[4]
- School of Chemistry, University of Bristol, Bristol, United Kingdom, Department of Chemistry, University of Bath, Bath, United Kingdom
- Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York, USA
- Department of Chemistry, University of Bath, Bath, United Kingdom
- School of Chemistry, University of Bristol, Bristol, United Kingdom
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); Engineering and Physical Sciences Research Council (EPSRC); Natural Environment Research Council; EPSRC Core Equipment Grant
- OSTI Identifier:
- 1865490
- Alternate Identifier(s):
- OSTI ID: 1869260
- Report Number(s):
- BNL-223001-2022-JAAM
Journal ID: ISSN 0278-6826; 2
- Grant/Contract Number:
- SC0012704; EP/S023593/1; NE/S014314/1; EP/V036440/1; EP/S018050/1
- Resource Type:
- Published Article
- Journal Name:
- Aerosol Science and Technology
- Additional Journal Information:
- Journal Name: Aerosol Science and Technology Journal Volume: 56 Journal Issue: 8; Journal ID: ISSN 0278-6826
- Publisher:
- Informa UK Limited
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Vokes, Elinor T., Lewis, Ernie R., Johnson, Andrew L., and Cotterell, Michael I. Densities of internally mixed organic-inorganic particles from mobility diameter measurements of aerodynamically classified aerosols. United States: N. p., 2022.
Web. doi:10.1080/02786826.2022.2062293.
Vokes, Elinor T., Lewis, Ernie R., Johnson, Andrew L., & Cotterell, Michael I. Densities of internally mixed organic-inorganic particles from mobility diameter measurements of aerodynamically classified aerosols. United States. https://doi.org/10.1080/02786826.2022.2062293
Vokes, Elinor T., Lewis, Ernie R., Johnson, Andrew L., and Cotterell, Michael I. Thu .
"Densities of internally mixed organic-inorganic particles from mobility diameter measurements of aerodynamically classified aerosols". United States. https://doi.org/10.1080/02786826.2022.2062293.
@article{osti_1865490,
title = {Densities of internally mixed organic-inorganic particles from mobility diameter measurements of aerodynamically classified aerosols},
author = {Vokes, Elinor T. and Lewis, Ernie R. and Johnson, Andrew L. and Cotterell, Michael I.},
abstractNote = {Accurate knowledge of particle density is essential for many aspects of aerosol science. Yet, density is often characterized poorly and incompletely for internally mixed particles, particularly for dry particles, with previous studies focused primarily on deliquescent (aqueous) drop- lets. Instead, densities for dry internally mixed particles are often inferred from mass composition measurements in combination with predictive models assuming ideal mixing, with the accuracy of such models not estimated. We determined particle densities from mobility diameter measurements (using a Scanning Mobility Particle Sizer, SMPS) for dried particles classified by their aerodynamic size (using an Aerosol Aerodynamic Classifier, AAC) for a range of two-component organic-inorganic particles containing known proportions of organic and inorganic species. We examined all permutations of mixing between four different organic (water soluble nigrosin dye, citric acid, polyethylene glycol-400, and ascorbic acid) and three different inorganic (sodium chloride, ammonium sulfate, and sodium nitrate) species. The accuracy and precision in our measured particle densities were ~5% and ~1%, respectively, for nonvolatile particles. Substantial deviations in particle density from ideal mixing (up to 20%) were observed. We tested descriptions of the non-ideal mixing for our systems by representing the volume change of mixing using Redlich-Kister (RK) polynomials in terms of mass fraction or in terms of mole fraction, with both approaches performing similarly.},
doi = {10.1080/02786826.2022.2062293},
journal = {Aerosol Science and Technology},
number = 8,
volume = 56,
place = {United States},
year = {2022},
month = {4}
}
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