Real Time Monitoring of Self Assembled Monolayers Using ATR: Implications to Atmospheric Organic Surfaces

December 10, 2003 - 12:00pm
Bldg. 90
Seminar Host/Point of Contact: 

Most studies of heterogeneous reactions on aerosols have focused on their implications for gas phase species. Less attention, however, has been given to the modification of aerosol surfaces during such reactions. Alteration of aerosol surface species may affect their hygroscopic and radiative properties as well as their reactivity toward other atmospheric trace species. In the present study, we use self-assembled organic monolayers (SAM) as proxies for atmospheric organic aerosols. Detection of even very short carbon chains (i.e., C3) as well as continuous monitoring of the SAMs during the experiments are achieved by depositing the SAMs directly on a silicon attenuated total reflection (ATR) crystal (10 reflections) attached to a FTIR.  The oxidation kinetics of unsaturated SAMs by ozone are studied using this technique, as a function of carbon chain length. Reaction probabilities are calculated based on surface oxidation and compared to molecular dynamic simulations of such systems and to probabilities previously calculated by gas phase monitoring. The atmospheric implications will be discussed.

Add event to Google Calendar

Announcement List

To be added to our seminar annoucement list please, email ETA Seminars. Seminars may change without notice, stay informed by joining our seminar email list. 

Site Access

For site access please email your request to ETA Seminars. To arrive at Building 90 via the LBNL shuttle, take "Blue Uphill". Click here for the shuttle schedule. To ensure your site access is set-up send your request 36 hours in advance of the seminar.

Remote Access

Not able to attend in person? Remote participants can use ReadyTalk Audio & Net conference to phone in to listen, while viewing the presentation via the ReadyTalk site.

Web Access Code: 4864835

USA & Canada call-in number:
1 (866) 740-1260
Access Code: 4864835#

International callers:
Please visit this website to see if a toll-free call-in number is available for your international location.

If not, you will need to pay for the call yourself and use this phone number:

(303) 248-0285.