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X-WR-CALDESC:Events for UNAM Nanoteknoloji Araştırma Merkezi
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DTSTART;TZID=Europe/Moscow:20211217T160000
DTEND;TZID=Europe/Moscow:20211217T170000
DTSTAMP:20260908T011902
CREATED:20211213T074324Z
LAST-MODIFIED:20211213T074324Z
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SUMMARY:Plasmon-Enhanced Light-Matter Interactions at the Nanoscale
DESCRIPTION:Wonmi Ahn\nMSN Graduate Program and UNAM \n\nNoble metal nanoparticles supporting collective oscillations of conduction electrons\, i.e.\, surface plasmon resonances\, exhibit excellent light-focusing ability and high spectral sensitivity to changes in the surrounding medium. These capabilities explain the increasing role of plasmonic nanomaterials in nanoimaging\, sensing\, energy\, and biomedical applications. However\, high dissipative losses in plasmonic metals and the lack of mass-production methods have been severe bottlenecks preventing their practical use in many applications. In this seminar\, I will show some of the approaches we have taken in the past to overcome the challenges in the field of plasmonics\, which have eventually led to the development of new classes of optoplasmonic materials and bottom-up nanofabrication methods. I will also show how we exploited the dissipative plasmonic loss\, which has been a significant drawback\, to generate hot carriers that drive chemical reactions. Beyond plasmonics\, I will also discuss light-matter interactions in the strong coupling regime (for both excitonic and vibrational absorbers)\, which have great potential to modify materials’ physical and chemical properties by light. The talk will conclude with future research directions that may spark interdisciplinary collaboration within the UNAM community. \n \nKonuşmacı hakkında\nWonmi Ahn obtained a Bachelor of Engineering degree in Chemical Engineering from Soongsil University in South Korea and a Ph.D. degree in Materials Science and Engineering from the University of Utah in the United States. She undertook postdoctoral research at Boston University in the United States and continued her research at the U.S. Naval Research Laboratory as a National Research Council postdoctoral fellow of the United States and later worked as a Materials Research Scientist. She has published more than 21 research papers\, including one U.S. Patent on a nanofabrication method based on electroless metal plating technique. Her research interests include light-matter interactions in the strong coupling regime\, plasmonic nanomaterials for photocatalysis\, plasmon-enhanced photoelectrochemistry\, and photonic-plasmonic hybrid materials for sensing applications. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/plasmon-enhanced-light-matter-interactions-at-the-nanoscale/
CATEGORIES:UNAM PI Seminars
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DTSTART;TZID=Europe/Moscow:20211224T160000
DTEND;TZID=Europe/Moscow:20211224T170000
DTSTAMP:20260908T011902
CREATED:20211221T101709Z
LAST-MODIFIED:20211221T101709Z
UID:6149-1640361600-1640365200@unam.bilkent.edu.tr
SUMMARY:Control of Static Electricity By Light and Polymer Mechanochemistry
DESCRIPTION:Bilge Baytekin\nMSN Graduate Program and UNAM \n\nThe mechanism of static electricity generation and mitigation on insulator surfaces upon rubbing/contact is one of the few scientific questions that have remained unanswered for millennia. Static charging (tribocharging) of insulators is not just a scientific mystery – it is also a significant problem\, especially critical for various industries\, e.g.\, polymer\, pharmaceuticals\, electronics\, and space. Several methods of tribocharge mitigation exist in practice; however\, none can reach the practicality of using light in the process. Here I will present light-controlled mitigation of triboelectric charges on common polymers. The tribocharged polymers are discharged upon illumination with appropriate wavelengths of light in the presence of a mediator organic dye. Our method provides spatial and temporal control on mitigation of static charges on common polymer surfaces by a mechanism that involves photoexcitation of organic dyes\, allowing an additional ‘wavelength control’. \nMechanochemistry of organics and polymers has long been studied\, but the link between the static electricity of polymers and mechanochemistry – despite its obvious presence – is still overlooked. In this talk\, I present this chemical link and show how the mechanochemical pathways and the generated mechanospecies can be used to make composites in a green chemistry way. \n \nKonuşmacı hakkında\nBilge Baytekin is an Assistant Professor in the Chemistry Department of Bilkent University. She received her Ph.D. from Freie Universitat Berlin and pursued her postdoctoral studies (2009-2014) at Northwestern University and Harvard University. Her research interests include static electricity\, organic and polymer mechanochemistry\, smart materials\, and soft robotics. She is the recipient of the Loreal Unesco for Women in Science\, TÜBA GEBIP\, BAGEP\, Mustafa Parlar Vakfı\, TÜBİTAK Teşvik Awards\, and 2019 Rising Star Award from the Electrostatics Society of America (ESA). She likes poetry and tea. She has a lovely daughter. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/control-of-static-electricity-by-light-and-polymer-mechanochemistry/
CATEGORIES:UNAM PI Seminars
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