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This Week at Physics

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Events on Thursday, March 9th, 2017

R. G. Herb Condensed Matter Seminar
Hyperpolarized Spins in Nanodiamond
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Ewa Rej, University of Sydney
Abstract: Nanodiamond is emerging as a platform for the development of nanoparticles for personalized medicine, based on its unique quantum mechanical properties, biocompatibility, and rich surface chemistry. Although diamonds have already been used for drug delivery of chemotherapeutics, and as optical sensors of sub cellular processes, a means of non-invasively detecting these nanoparticles in-vivo is still lacking.
I will present work towards developing nanodiamond as a new bioagent for MRI. By increasing the 13C nuclear spin polarization in diamond, we boost the detectable NMR signal by several orders of magnitude. These hyperpolarization techniques, combined with the long T1 relaxation times of up to an hour in nanodiamond, open the possibility of using standard MRI techniques to image small concentrations of nanoparticles over long time scales.
I will also present work examining T2 spin-spin relaxation times, demonstrating how T2 can increase by three orders of magnitude using hyperpolarization combined with dynamical decoupling sequences.
Host: McDermott
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Neutrinos, DUNE, and Liquid Argon Time Projection Chambers
Time: 11:00 am
Place: Physical Sciences Lab, Stoughton, WI
Speaker: Michelle Stancari, Fermilab
Host: Physical Sciences Lab (PSL)
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Astronomy Colloquium
Physical Conditions in the Cold ISM of Nearby Galaxies and Their Relation to Star Formation
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and Cookies at 3:30 PM. Talk begins 3:45 PM
Speaker: Adam Leroy, Ohio State University
Abstract: I will present results from several new projects using ALMA, the IRAM mm-wave telescopes, and soon the Green Bank Telescope to map physical conditions in the molecular gas of nearby galaxies. Using multi-line spectroscopy we are able to constrain the gas density distribution in each part of the galaxy, while using high resolution CO imaging we can measure the structure (density, turbulence, and self-gravity) of the interstellar medium on the scale of individual star-forming clouds. The ability to make such measurements over a large part of a star forming galaxy is new in the last few years, thanks to the IRAM programs EMPIRE and PAWS, the beginning of ALMA operations (and our PHANGS CO survey), and upgrades to the GBT. I will show how the amount of dense gas changes across the disk of galaxies, and illustrate a more nuanced role for gas density in star formation than commonly asserted. I will also show how the basic cloud-scale structure of the cold interstellar medium changes from galaxy-to-galaxy, reflecting the local environment, and I will show how these local structural conditions relate to gas density and star formation in the best studied nearby galaxies. Finally, I will highlight first results several new surveys with ALMA (as part of the PHANGS collaboration) that promise to give us a sharp new view of cold gas in nearby galaxies over the next years.
Host: Astronomy Department
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