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November 2019

MSE Seminar: “Exploring Photonic Materials with Symmetry and Topology”

November 21 at 10:45 AM - 11:45 AM
Auditorium, LRSM Building, 3231 Walnut Street
Philadelphia, PA 19104 United States
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Symmetry and topology are fundamental notions existing in all kinds of natural systems, from spiral galaxies and hurricanes to amino acids in molecules and non-trivial topologically protected electronic states in condensed matter. A stream of photons is typically topologically trivial, nevertheless, its full-vector nature intrinsically endows light with full capability of creating and carrying unique symmetry and topology, especially non-Hermitian symmetries that cannot be easily implemented in condensed matter. Explorations of symmetry and topology on a photonic platform not only…

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MEAM Seminar: “Micro/Nanomanufacturing of 3D Functional Coatings via Self-Limiting Electrospray Deposition”

November 26 at 10:30 AM - 12:00 PM
Wu and Chen Auditorium (Room 101), Levine Hall, 3330 Walnut Street
Philadelphia, PA 19104 United States
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Recent developments in nanostructured materials have demonstrated myriad desirable properties ranging from optical and mechanical metamaterials to biomanipulative surfaces. To bring these properties from the lab to the commercial space will require innovative nanomanufacturing strategies focused on scalable and cost-effective techniques. My lab, the Hybrid Micro/Nanomanufacturing Laboratory, applies the manipulation of fundamental driving forces to this challenge through combinations of top-down and bottom-up techniques for new hybrid lithographic strategies. In this seminar, I will highlight one such strategy: self-limiting electrospray…

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December 2019

MSE Seminar: “In-Situ Resistance Degradation & Switching of Bulk Fe-doped SrTiO3 and Yttria-Stabilized Zirconia”

December 5 at 10:45 AM - 11:45 AM
Auditorium, LRSM Building, 3231 Walnut Street
Philadelphia, PA 19104 United States
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Perovskite-type titanates are the standard dielectric used in multilayer ceramic capacitors (MLCCs), and yttria-stabilized (YSZ) is the prototypical fast oxygen conductor used in solid oxide fuel cells (SOFCs) and oxygen sensors. Under a DC electric field, the resistance of YSZ and Fe-doped strontium titanate (Fe-STO) degrades in an indistinguishable way. This is surprising because, unlike YSZ, Fe-STO is a p-type semiconductor, so they cannot possibly degrade by the same mechanism. For decades, it is known that the degradation of perovskite…

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