159x Filetype PPTX File size 0.36 MB Source: als.lbl.gov
Chemical kinetics in submicron droplets Opportunity ALS-U Tools Required Submicron droplets are reactive compartments Soft x-ray imaging/spectroscopy beamline with whose overall chemistry is governed by ~1 mm focal spot (possibly nanofocus); flexible interplay of surface and bulk processes. There is sample environment (temperature, humidity); emerging evidence that confined reactions colliding aerosol droplet jets for rapid mixing proceed via much different mechanisms and and sub-ms chemical kinetic measurements; rates than the same reactions in macroscopic optical and electrostatic aerosol traps containers. Importance of ALS-U Broader Scientific Impact The coherence of ALS-U will enable soft x-ray Aerosol chemistry is one of the more poorly microscopy, correlation spectroscopy, and modeled feature of earth’s climate system; nanoprobe spectroscopies to probe chemical droplets replicate complex chemistry relevant structure and kinetics with nanoscale sensitivity. to many realistic environments, e.g., geological References: pores, atmospheric aerosols, micelles, etc. Carroll, B.; Hidrovo, C., Experimental Investigation of Inertial Mixing in Colliding Droplets. Heat Transfer Engineering 2013, 34, (2-3), 120-130. Lee, J. K.; Kim, S.; Nam, H. G.; Zare, R. N., Microdroplet fusion mass spectrometry for fast reaction kinetics. Proceedings of the National Academy of Sciences 2015, 112, (13), 3898-3903. IPCC, Climate Change: The Physical Science Basis - Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Contact: Kevin Wilson, LBNL/CSD Press: Cambridge, 2007. 2
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