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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-425
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
29 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Kinetic Controlled Glass Transition Measurement of Organic Aerosol Thin Films Using Broadband Dielectric Spectroscopy
Yue Zhang1,2,a, Shachi Katira3, Andrew Lee1,b, Andrew T. Lambe2, Timothy B. Onasch1,2, Wen Xu2, William A. Brooks2, Manjula R. Canagaratna2, Andrew Freedman2, John T. Jayne2, Doug R. Worsnop2, Paul Davidovits1, David Chandler3,†, and Charles E. Kolb2 1Department of Chemistry, Boston College, Chestnut Hill, MA, 02459
2Aerodyne Research Inc., Billerica, MA, 01821
3Department of Chemistry, University of California, Berkeley, CA, 94720
anow at: Department of Environmental Science and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill
bnow at: Department of Chemistry, University of North Carolina at Chapel Hill
deceased, April 2017
Abstract. Glass transitions from liquid to semi-solid and solid phase states have important implications for reactivity, growth, and cloud forming (cloud condensation nuclei and ice nucleation) capabilities of secondary organic aerosols (SOA). The small size and relatively low mass concentration of SOA in the atmosphere make it difficult to measure atmospheric SOA glass transitions using conventional methods. To circumvent these difficulties, we have adopted a new technique for measuring glass forming properties of atmospherically relevant organic aerosols. Aerosol particles to be studied are deposited in the form of a thin film onto an interdigitated electrode (IDE) using electrostatic precipitation. Dielectric spectroscopy provides dipole relaxation rates for organic aerosols as a function of temperature (373 to 233 K) that are used to calculate the glass transition temperatures for several cooling rates. IDE-enabled broadband dielectric spectroscopy (BDS) was successfully used to measure the kinetically controlled glass transition temperatures of glycerol and citric acid aerosols with selected cooling rates. The glass transition results agree well with available literature data for these two compounds. The results indicate that the IDE-BDS method can provide accurate glass transition data for organic aerosols under atmospheric conditions. The BDS data obtained with the IDE-BDS technique can be used to characterize glass transitions for both simulated and ambient organic aerosols and to model their climate effects.

Citation: Zhang, Y., Katira, S., Lee, A., Lambe, A. T., Onasch, T. B., Xu, W., Brooks, W. A., Canagaratna, M. R., Freedman, A., Jayne, J. T., Worsnop, D. R., Davidovits, P., Chandler, D., and Kolb, C. E.: Kinetic Controlled Glass Transition Measurement of Organic Aerosol Thin Films Using Broadband Dielectric Spectroscopy, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-425, in review, 2018.
Yue Zhang et al.
Yue Zhang et al.

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Short summary
We have adopted a new technique for measuring glass forming properties of atmospherically relevant organic aerosols at submicron sizes and relatively low mass concentrations. Aerosol particles are deposited in the form of a thin film with interdigitated electrodes using electrostatic precipitation. Broadband dielectric spectroscopy is used to measure the kinetically controlled glass transition temperatures of glycerol and citric acid aerosols with three atmospheric relevant cooling rates.
We have adopted a new technique for measuring glass forming properties of atmospherically...
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