Lilo Pozzo, University of Washington (CMU Chemistry)
Understanding Nanoscale and Molecular Processes in Emulsions Systems
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Abstract: Emulsions are dynamic and complex systems with several physical mechanisms possibly leading to the formation, destruction and transformation of their interfacial and bulk structures. Simultaneously, emulsions are increasingly being used in consumer products (creams, cosmetics), for the synthesis of advanced materials (latexes, nanoparticles), in medicine (disease diagnosis and treatment) and in energy technologies (oil extraction and processing). This talk will summarize our past work using neutron and x-ray scattering to uncover fundamental colloidal and transport principles that are essential to understand in order to design new emulsion technologies for specific uses. I will briefly introduce the techniques of small angle neutron and x-ray scattering (SANS, SAXS) followed by the discussion of several examples showcasing how these have been applied to understand the formation of Pickering emulsions, the synthesis of ultrasound medical contrast agents, sonochemical production of semiconductor nanoparticles (quantum dots) and finally the analysis of mass transport processes occurring within emulsion systems using contrast variation small angle neutron scattering.