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SUMMARY:IMX Seminar Series - Chemical and physical processes in the confin
 ed environment of an aerosol particle
DTSTART:20241028T131500
DTEND:20241028T141500
DTSTAMP:20260502T045730Z
UID:16cf572d2739b6f13a18636a5e881ed8e119e49d0379847ac124c575
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ruth Signorell\, ETHZ\nPhotochemical processes have been
  identified as the main cause of the degradation and oxidation of matter i
 n atmospheric aerosol particles. When light interacts with an aerosol part
 icle\, the light intensity inside the particle can be significantly increa
 sed as the latter acts as a light-amplifying cavity. These optical confine
 ment effects lead to an acceleration of photochemical reactions in aerosol
  particles compared to reactions in extended condensed matter. We studied 
 and quantified the acceleration of in-particle photochemistry using photoa
 coustic spectroscopy [1] and X-ray spectroscopic imaging of single aerosol
  particles [2].\n\nThe formation of new particles through condensation fro
 m the gas phase is an important source of aerosols. Volatile vapor compone
 nts can accelerate the nucleation of other\, less volatile vapor component
 s by orders of magnitude. To investigate the molecular mechanism behind ac
 celerated vapor nucleation\, we developed a new nucleation tool based on L
 aval expansions combined with soft cluster ionization [1]. We find that a 
 catalytic cycle involving transient heteromolecular clusters is the origin
  of this acceleration phenomenon.\n\n1. J.W. Cremer\, K.M. Thaler\, C. Hai
 sch\, R. Signorell\, „Photoacoustics of single laser-trapped nanodroplet
 s for the direct observation of nanofocusing in aerosol photokinectics”\
 , Nat. Commun.\, 7\, 10941 (2016)\n2. P.C. Arroyo\, G. David\, P.A. Alpe
 rt\, E.A. Parmentier\, M. Ammann and R. Signorell\, „Amplification of li
 ght within aerosol particles accelerates in-particle photochemistry”\, 
 Science\, 376\, 293-296 (2022).\n3. C. Li\, J. Krohn\, M. Lippe and R. Sig
 norell\, Sci. Adv.\, 7\, eabd9954 (2021).\n\nBio: Ruth Signorell received
  her MSc and PhD degrees in molecular spectroscopy from the Swiss Federal 
 Institute of Technology (ETH). She began her aerosol research in 2002 as a
 n assistant professor at the Georg-August University of Göttingen. From 2
 005 to 2012 she was an associate professor and later a full professor at t
 he University of British Columbia in Vancouver\, Canada. In 2012 she retur
 ned to Switzerland to take up a position as full professor of physical che
 mistry at the Department of Chemistry and Applied Biosciences at ETH Zuric
 h. Her research interests focus on spectroscopic studies of fundamental pr
 ocesses in aerosol particles and clusters held together by weak intermolec
 ular forces. She is co-editor of a book on the topic “Fundamentals and A
 pplications in Aerosol Spectroscopy (MUOAA)” and co-founder of the aeros
 ol conference “Molecular-Level Understanding of Atmospheric Aerosols”.
 \n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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