Coalescence Sampling and Analysis of Aerosols using Aerosol Optical Tweezers

We present a first exploratory study to assess the use of aerosol optical tweezers as an instrument for sampling and detecting accumulation- and coarse-mode aerosol. A subpicoliter aqueous aerosol droplet is captured in the optical trap and used as a sampling volume, accreting mass from a free-flowi...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2017-02, Vol.89 (4), p.2345-2352
Main Authors: Haddrell, Allen E, Miles, Rachael E. H, Bzdek, Bryan R, Reid, Jonathan P, Hopkins, Rebecca J, Walker, Jim S
Format: Article
Language:English
Subjects:
Aerosols
Analytical chemistry
Atmospheric aerosols
Coalescence
Coalescing
Droplets
Equivalence
Measurement
Refractivity
Sampling
Standard deviation
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Summary:We present a first exploratory study to assess the use of aerosol optical tweezers as an instrument for sampling and detecting accumulation- and coarse-mode aerosol. A subpicoliter aqueous aerosol droplet is captured in the optical trap and used as a sampling volume, accreting mass from a free-flowing aerosol generated by a medical nebulizer or atomizer. Real-time measurements of the initial stability in size, refractive index, and composition of the sampling droplet inferred from Raman spectroscopy confirm that these quantities can be measured with high accuracy and low noise. Typical standard deviations in size and refractive index of the sampling droplet over a period of 200 s are
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.6b03979