Photoacoustics of single aerosol droplets immobilised by counter-propagating optical tweezers
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Date
2020-08
Publication Type
Conference Paper
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yes
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Abstract
In this contribution we discuss the influence of relative humidity on photoacoustic measurements from both an experimental and theoretical perspective. We present a refined model of the photoacoustic (PA) signal that accounts for elevated particle temperatures and different levels of relative humidity. We use this new model together with the photoacoustic data collected with our photothermal single-particle spectrometer (PSPS) to retrieve the mass accommodation coefficients of water on organic aerosol particles. The single-particle nature of our experiments is achieved by employing counter-propagating tweezers. Furthermore, we investigate the influence of relative humidity on the eigenfrequency of the PA cell.
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published
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Book title
Proceedings Volume c, Optical Trapping and Optical Micromanipulation XVII; 1146316 (2020)
Journal / series
Volume
11463
Pages / Article No.
1146316
Publisher
SPIE
Event
SPIE Nanoscience + Engineering (2020)
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Date collected
Date created
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Organisational unit
03961 - Signorell, Ruth / Signorell, Ruth
Notes
Due to the Corona virus (COVID-19) the conference was conducted virtually.
Funding
177479 - Fundamentals of Aerosol Photoacoustic Spectroscopy (SNF)
172472 - Phase Transitions of Ultrafine Aerosol Particles: Condensation, Freezing, and Metal Formation in Confined Systems (SNF)
172472 - Phase Transitions of Ultrafine Aerosol Particles: Condensation, Freezing, and Metal Formation in Confined Systems (SNF)