Events

Friday, December 2, 2016 -
12:00pm to 1:00pm
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100F Pierce Hall, 29 Oxford St., Cambridge

Atmospheric & Environmental Chemistry Seminar

"Effect of particle Morphology – in particular Liquid-liquid phase separation - on the absorption cross section of aerosol particles containing black carbon" with Ulrich Krieger, ETH Zurich.

While it is well known that absorption by light absorbing black carbon (BC) increases when the carbon is internally mixed with other material (e.g. Bond et al. 2013), the magnitude of this enhancement is still under debate (e.g. Cappa et al., 2013). Understanding the large variability of measured absorption enhancement in the field relies on an appropriate representation of carbon morphology and mixing with other materials (Scarnato et al., 2013). Here we investigate how liquid-liquid phase separation (LLPS) influences the absorption cross section of particles containing black carbon aggregates. Recently, we showed that black carbon (BC) preferentially segregates into the organic phase upon LLPS in micron size particles (Brunamonti et al. 2015), resulting in an “inverted core-shell structure”, in which a transparent aqueous core is surrounded by a BC-containing absorbing shell. In the Brunamonti et al. study, the radiative effect for accumulation size particles was estimated assuming the BC-absorption to be volume mixed within the shell. We will compare this with a more realistic treatment of the black carbon as fractal aggregate and also study configurations in which the black carbon is only partially embedded in the organic liquid phase.

 

 

Contact Name: 

Adam Birdsall

Harvard University
Center for the Environment

NEW! Address: 26 Oxford Street, 4th Floor, Cambridge
Email: huce@environment.harvard.edu
Phone: (617) 495-0368

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