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ORGANIZER;CN=SOCAAR:mailto:[log in to unmask]
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN="SOCAAR-l:
Southern Ontario Centre for Atmospheric Aerosol Research":mailto:SOCAAR-L@l
istserv.utoronto.ca
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=Christophe
r Lim:mailto:[log in to unmask]
ATTACH:CID:[log in to unmask]
DESCRIPTION;LANGUAGE=en-US:Hi Everyone\,\n\nHappy New Year!\n\nSOCAAR is pl
eased to announce our first Seminar for 2020:\n\nWednesday\, January 15\,
2020\n3:00 - 4:00PM\nWallberg Building\, 200 College Street\, Room 215\n\n
\n\n\nChristopher Y. Lim\nPostdoctoral Fellow\nDepartment of Chemistry\nUn
iversity of Toronto\n\n\nLaboratory aging of organic particulate matter an
d indoor films: kinetics and products from the heterogeneous oxidation of
model organic aerosol and thirdhand smoke surfaces\n\nThe chemistry of org
anic aerosol (OA) and indoor films is immensely complex due to the vast nu
mber of organic compounds present in the air and on surfaces and their com
plex reaction pathways. Laboratory experiments have generally focused on t
he initial formation of OA from volatile organic compounds (VOCs)\, but ha
ve neglected processes that can change the composition and loading of orga
nics over longer timescales (“aging”). This seminar will describe seve
ral laboratory studies that better constrain the effects of heterogeneous
oxidation\, the reaction of gas-phase radicals with organic molecules in t
he condensed phase\, both outdoors and indoors. First\, the effect of part
icle morphology on the rate of heterogeneous oxidation is examined by comp
aring the hydroxyl radical (OH) oxidation of particles with thin organic c
oatings to pure organic particles. Results show that morphology can have a
strong impact on oxidation kinetics and that particles with high organic
surface area to volume ratios can be rapidly oxidized. Second\, the molecu
lar products from the heterogeneous OH oxidation of model organic particle
s are measured. Significant concentrations of oxygenated VOCs are observed
in the gas phase indicating the importance of fragmentation reactions tha
t break carbon-carbon bonds and decrease OA mass. Finally\, the effect of
aging on organic films indoors is examined by measuring the heterogeneous
ozonolysis products of lingering cigarette smoke on surfaces (thirdhand sm
oke). Small\, gas-phase acids are found to be significantly enhanced when
the surfaces are exposed to ozone. The results from this work emphasize th
at aging of organic particles and films can significantly alter their comp
osition and lead to the volatilization of gas-phase products.\n\n───
────────────────────────
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lease join my meeting from your computer\, tablet or smartphone.\n\n\nhttp
s://global.gotomeeting.com/join/125236597\n\nYou can also dial in using yo
ur phone.\n\nCanada: +1 (647) 497-9391\n- One-touch: tel:+16474979391\,\,1
25236597#\n\nAccess Code: 125-236-597\n\nNe
w to GoToMeeting? Get the app now and be ready when your first meeting sta
rts: https://global.gotomeeting.com/install/125236597\n\n─────
────────────────────────
─────────────────────\n\n\nNatal
ie Leung\nFinancial and Administrative Assistant | Southern Ontario Centre
for Atmospheric Aerosol Research\, University of Toronto\nwww.socaar.utor
onto.ca\n200 College Street\, Toronto\, ON\, Canada\, M5S 3E5\n• 416 978
5932 | • [log in to unmask]\n\n\n
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01000000099C9FB37C855C44DA2FE03C3C99BBF47
SUMMARY;LANGUAGE=en-US:SOCAAR Seminar - Dr. Christopher Lim
DTSTART;TZID=Eastern Standard Time:20200115T150000
DTEND;TZID=Eastern Standard Time:20200115T160000
CLASS:PUBLIC
PRIORITY:5
DTSTAMP:20200107T151937Z
TRANSP:OPAQUE
STATUS:CONFIRMED
SEQUENCE:0
LOCATION;LANGUAGE=en-US:WB 215 - 200 College St
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