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DTSTART;TZID=America/New_York:20210111T150000
DTEND;TZID=America/New_York:20210111T170000
DTSTAMP:20260407T112916
CREATED:20201221T160845Z
LAST-MODIFIED:20201221T160845Z
UID:10006569-1610377200-1610384400@seasevents.nmsdev7.com
SUMMARY:CBE PhD Dissertation Defense | Study of Metal Catalysts Supported on Thin Films of Perovskites prepared by Atomic Layer Deposition (ALD)
DESCRIPTION:Abstract: \n\nSintering is a severe problem with supported-metal catalysts in high-temperature applications\, such as in automotive-emissions control\, because it leads to a loss of catalytically active surface area. To stabilize the metal particles\, in 2001\, the Daihatsu group proposed using perovskite-supported metals\, which they referred to as “intelligent” catalysts. The original goal was to regenerate sintered metals by driving the metal into the oxide lattice by high-temperature oxidation and releasing the metal as small particles by reduction. Unfortunately\, the concept has not been entirely successful\, partially because of the large crystallite size and low surface areas of typical perovskites. To achieve higher surface areas and reduce the length scale for any ingress-egress of metal particles\, Atomic Layer Deposition (ALD) was used in this thesis to prepare thermally stable thin films of perovskites on high-surface-area supports. Metal catalysts\, Pt\, Ni\, Pd\, and Rh\, were deposited onto the perovskite thin films\, LaCoO 3 and LaFeO 3 \, using ALD.\n\n\n\n\n\nThis thesis focused on studying metal-perovskite interactions in the ALD samples of metals supported on LaFeO 3 films. It was found that metal-perovskite interactions could dramatically affect the preferential alignment of metal particles with the substrate\, the metal dispersions\, and catalytic activity. In the presence of the perovskite films\, the equilibrium oxidation of the metals could also shift several order-of-magnitudes towards lower PO 2 . The changes in the thermodynamic properties would further cause different catalytic behaviors. Systems of different metals supported on LaFeO 3 films were studied and compared; it was found that the metal-perovskite interaction is specific for each system.
URL:https://seasevents.nmsdev7.com/event/cbe-phd-dissertation-defense-study-of-metal-catalysts-supported-on-thin-films-of-perovskites-prepared-by-atomic-layer-deposition-ald/
LOCATION:Zoom – Email CBE for link
CATEGORIES:Doctoral,Graduate,Dissertation or Thesis Defense
ORGANIZER;CN="Chemical and Biomolecular Engineering":MAILTO:cbemail@seas.upenn.edu
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DTSTART;TZID=America/New_York:20210114T104500
DTEND;TZID=America/New_York:20210114T114500
DTSTAMP:20260407T112916
CREATED:20210107T165845Z
LAST-MODIFIED:20210107T165845Z
UID:10006571-1610621100-1610624700@seasevents.nmsdev7.com
SUMMARY:MSE Seminar: "The light stuff: sculpting photons at the molecular-scale for sustainability"
DESCRIPTION:We present methods to sculpt light at the atomic and molecular scale to detect and control chemical transformations\, en-route to improved planetary and personal health. First\, we study plasmon-driven chemical transformations\, focussing on the photocatalytic dehydrogenation of AuPd systems. Here\, the Au acts as a plasmonic light absorber and Pd serves as the catalyst. Using optically-coupled electron microscopy\, we find that plasmons modify the rate of distinct reaction steps differently\, increasing the overall rate more than ten-fold. Plasmons also open a new reaction pathway that is not observed without illumination\, laying a foundation for site-selective and product-specific photocatalysts. Next\, we describe methods to enable enantiospecific photochemistry\, using resonant dielectric nanoparticles. By overlapping electric and magnetic resonances\, these nanostructures can significantly enhance circular dichroism for improved chiral sensing and spectroscopy as well as high-yield enantioselective photochemistry. Finally\, we describe resonant nanophotonic surfaces that enable multiplexed detection of SARS-CoV-2 gene sequences. The high quality factor (high-Q) produces a large amplification of the electromagnetic field intensities near the nanostructures that increase the response to minute refractive index changes from targeted binding of nucleic acids; simultaneously\, the optical signal is beam-steered for multiplexed detection. We will present the design and development of this quantitative optical assay\, as well as application to clinical samples.
URL:https://seasevents.nmsdev7.com/event/mse-seminar-the-light-stuff-sculpting-photons-at-the-molecular-scale-for-sustainability/
LOCATION:PA
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
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DTSTART;TZID=America/New_York:20210115T150000
DTEND;TZID=America/New_York:20210115T160000
DTSTAMP:20260407T112916
CREATED:20201202T171228Z
LAST-MODIFIED:20201202T171228Z
UID:10006555-1610722800-1610726400@seasevents.nmsdev7.com
SUMMARY:Doctoral Dissertation Defense: "Multiscale Modeling of Cell Fate Switching to Predict Patient-specific Responses to Combination Cancer Therapy" (Lindsey Fernandez)
DESCRIPTION:The Department of Bioengineering at the University of Pennsylvania and Dr. Ravi Radhakrishnan are pleased to announce the Doctoral Dissertation Defense of Lindsey Fernandez. The public is welcome to attend via Blujeans (Meeting ID 680 058 608 4). \nTitle: “Multiscale Modeling of Cell Fate Switching to Predict Patient-specific Response to Combination Cancer Therapy”
URL:https://seasevents.nmsdev7.com/event/doctoral-dissertation-defense-multiscale-modeling-of-cell-fate-switching-to-predict-patient-specific-responses-to-combination-cancer-therapy-lindsey-fernandez/
LOCATION:PA
CATEGORIES:Doctoral,Student,Dissertation or Thesis Defense
ORGANIZER;CN="Bioengineering":MAILTO:be@seas.upenn.edu
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