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Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics

Photochemistry taking place in atmospheric aerosol droplets has a significant impact on the Earth's climate. Nanofocusing of electromagnetic radiation inside aerosols plays a crucial role in their absorption behaviour, since the radiation flux inside the droplet strongly affects the activation...

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Autores principales: Cremer, Johannes W., Thaler, Klemens M., Haisch, Christoph, Signorell, Ruth
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4799369/
https://www.ncbi.nlm.nih.gov/pubmed/26979973
http://dx.doi.org/10.1038/ncomms10941
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author Cremer, Johannes W.
Thaler, Klemens M.
Haisch, Christoph
Signorell, Ruth
author_facet Cremer, Johannes W.
Thaler, Klemens M.
Haisch, Christoph
Signorell, Ruth
author_sort Cremer, Johannes W.
collection PubMed
description Photochemistry taking place in atmospheric aerosol droplets has a significant impact on the Earth's climate. Nanofocusing of electromagnetic radiation inside aerosols plays a crucial role in their absorption behaviour, since the radiation flux inside the droplet strongly affects the activation rate of photochemically active species. However, size-dependent nanofocusing effects in the photokinetics of small aerosols have escaped direct observation due to the inability to measure absorption signatures from single droplets. Here we show that photoacoustic measurements on optically trapped single nanodroplets provide a direct, broadly applicable method to measure absorption with attolitre sensitivity. We demonstrate for a model aerosol that the photolysis is accelerated by an order of magnitude in the sub-micron to micron size range, compared with larger droplets. The versatility of our technique promises broad applicability to absorption studies of aerosol particles, such as atmospheric aerosols where quantitative photokinetic data are critical for climate predictions.
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spelling pubmed-47993692016-03-23 Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics Cremer, Johannes W. Thaler, Klemens M. Haisch, Christoph Signorell, Ruth Nat Commun Article Photochemistry taking place in atmospheric aerosol droplets has a significant impact on the Earth's climate. Nanofocusing of electromagnetic radiation inside aerosols plays a crucial role in their absorption behaviour, since the radiation flux inside the droplet strongly affects the activation rate of photochemically active species. However, size-dependent nanofocusing effects in the photokinetics of small aerosols have escaped direct observation due to the inability to measure absorption signatures from single droplets. Here we show that photoacoustic measurements on optically trapped single nanodroplets provide a direct, broadly applicable method to measure absorption with attolitre sensitivity. We demonstrate for a model aerosol that the photolysis is accelerated by an order of magnitude in the sub-micron to micron size range, compared with larger droplets. The versatility of our technique promises broad applicability to absorption studies of aerosol particles, such as atmospheric aerosols where quantitative photokinetic data are critical for climate predictions. Nature Publishing Group 2016-03-16 /pmc/articles/PMC4799369/ /pubmed/26979973 http://dx.doi.org/10.1038/ncomms10941 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Cremer, Johannes W.
Thaler, Klemens M.
Haisch, Christoph
Signorell, Ruth
Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
title Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
title_full Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
title_fullStr Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
title_full_unstemmed Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
title_short Photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
title_sort photoacoustics of single laser-trapped nanodroplets for the direct observation of nanofocusing in aerosol photokinetics
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4799369/
https://www.ncbi.nlm.nih.gov/pubmed/26979973
http://dx.doi.org/10.1038/ncomms10941
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