Imperial College London
Portrait Picture

Professor Marina Kuimova

Faculty of Natural Sciences, Department of Chemistry

Professor of Chemical Physics
 
 
 
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Contact

 

+44 (0)20 7594 8558m.kuimova

 
 
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Location

 

207BMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hosny:2016:10.1039/c5sc02959g,
author = {Hosny, NA and Fitzgerald, C and Vysniauskas, A and Athanasiadis, A and Berkemeier, T and Uygur, N and Poeschl, U and Shiraiwa, M and Kalberer, M and Pope, FD and Kuimova, MK},
doi = {10.1039/c5sc02959g},
journal = {Chemical Science},
pages = {1357--1367},
title = {Direct imaging of changes in aerosol particle viscosity upon hydration and chemical aging},
url = {http://dx.doi.org/10.1039/c5sc02959g},
volume = {7},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Organic aerosol particles (OA) play major roles in atmospheric chemistry, climate, and public health. Aerosol particle viscosity is highly important since it can determine the ability of chemical species such as oxidants, organics or water to diffuse into the particle bulk. Recent measurements indicate that OA may be present in highly viscous states, however, diffusion rates of small molecules such as water are not limited by these high viscosities. Direct observational evidence of kinetic barriers caused by high viscosity and low diffusivity in aerosol particles were not available until recently; and techniques that are able to dynamically quantify and track viscosity changes during atmospherically relevant processes are still unavailable for atmospheric aerosols. Here we report quantitative, real-time, online observations of microscopic viscosity changes in aerosol particles of atmospherically relevant composition, using fluorescence lifetime imaging (FLIM) of viscosity. We show that microviscosity in ozonated oleic acid droplets and secondary organic aerosol (SOA) particles formed by ozonolysis of myrcene increases substantially with decreasing humidity and atmospheric oxidative aging processes. Furthermore, we found unexpected heterogeneities of microviscosity inside individual aerosol particles. The results of this study enhance our understanding of organic aerosol processes on microscopic scales and may have important implications for the modeling of atmospheric aerosol growth, composition and interactions with trace gases and clouds.
AU  - Hosny,NA
AU  - Fitzgerald,C
AU  - Vysniauskas,A
AU  - Athanasiadis,A
AU  - Berkemeier,T
AU  - Uygur,N
AU  - Poeschl,U
AU  - Shiraiwa,M
AU  - Kalberer,M
AU  - Pope,FD
AU  - Kuimova,MK
DO  - 10.1039/c5sc02959g
EP  - 1367
PY  - 2016///
SN  - 2041-6539
SP  - 1357
TI  - Direct imaging of changes in aerosol particle viscosity upon hydration and chemical aging
T2  - Chemical Science
UR  - http://dx.doi.org/10.1039/c5sc02959g
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368835300064&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://pubs.rsc.org/en/content/articlelanding/2016/SC/C5SC02959G#!divAbstract
UR  - http://hdl.handle.net/10044/1/30535
VL  - 7
ER  -
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