A Flow-Focused Droplet Train for Investigating Liquid Phase Processes with Ambient Pressure XPS in the tender X-ray range.
| Dates: | 23 June 2021 |
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| Times: | 12:00 - 13:00 |
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| What is it: | Seminar |
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| Organiser: | Photon Science Institute |
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| Who is it for: | University staff, Current University students |
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| Speaker: | Dr. Pip Clark |
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Join us for this PSI seminar with guest speaker Dr. Pip Clark. The chemical and physical properties of liquid droplets or aerosols are becoming increasingly important to understand due to their relevance in atmospheric science, chemical synthesis, material deposition techniques, and the transmission of respiratory diseases. Due to pressure advances in ambient pressure x-ray photoelectron spectroscopy (APXPS), various liquids (including aqueous systems at room temperature) can now be measured in equilibrium with their vapor phase. Subsequently, by combining APXPS with tender X-rays (>2000 eV) two advantages are gained: 1) higher kinetic energy photoelectrons can be measured, which reduces the intensity loss due to gas phase scattering and 2) probing depths are increased, allowing the chemical and physical properties of a bulk liquid to be studied. This talk will cover a newly commissioned droplet train-APXPS experiment, where thousands of falling micro-droplets are generated and measured every second. Features of the droplet train system and recent experiments on different liquid systems will be discussed.
Speaker
Dr. Pip Clark
Organisation: Helmholtz-Zentrum Berlin
Biography: Pip C. J. Clark received a MPhys (Hons) (Physics) from the University of Manchester in 2014 and completed a PhD under the supervision of Prof. Wendy Flavell in 2018. She then joined the group of David Starr as a postdoctoral researcher in the group at the Helmholtz-Zentrum Berlin (BESSY II). Here she designed, built, and commissioned a droplet train module for the new ambient pressure X-ray photoelectron spectroscopy (APXPS) end-station SpAnTeX (Spectroscopic Analysis with Tender X-rays). Her research interests are in chemical and physical phenomena in liquids, particularly at the solid/liquid and liquid/vapor interfaces.
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