{"641093":{"#nid":"641093","#data":{"type":"event","title":"PhD Defense by Lisa Savagian","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETHE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGEORGIA INSTITUTE OF TECHNOLOGY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EUnder the provisions of the regulations for the degree\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\nDOCTOR OF PHILOSOPHY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Eon Friday, November 20, 2020\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E12:30 PM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003Evia\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EBluejeans Video Conferencing\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Ca href=\u0022https:\/\/bluejeans.com\/615995348\u0022\u003Ehttps:\/\/bluejeans.com\/615995348\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ewill be held the\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDISSERTATION\u0026nbsp;DEFENSE\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\nfor\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ELisa Savagian\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026quot;Establishing Design Principles for Polythiophenes Used in Electrochemical Applications\u0026quot;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. John Reynolds, Advisor, CHEM\/MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Natalie Stingelin, MSE\/CHBE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Carlos Silva, CHEM\/PHYS\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Blair Brettmann, CHBE\/MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Vladimir Tsukruk, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAmong the many applications that capitalize on the electrochemical functionality of \u0026pi;-conjugated polymers, electrochromic devices (ECDs) and organic electrochemical transistors (OECTs) have attracted considerable interest. The operation of these devices hinges on electrochemical doping reactions that effectuate the desired color change or conductivity modulation. Understanding relationships between polymer structure and redox properties is essential for the rational design of active materials and the development of viable application spaces. This dissertation aims to explore materials design strategies for tuning the functional properties of polythiophenes for use in ECDs and OECTs.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFirst, solution co-processing of poly(dioxythiophenes) is presented as a straightforward and scalable technique for accessing high-contrast black-to-transmissive electrochromic films with low driving voltages, extended functional lifetimes, and minimal transient chromaticity. These efforts demonstrate how judicious blend formulation, particularly in the choice of the mid- and high-gap chromophore components, can be leveraged to control the coloration of ECDs.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ENext, this work establishes a comprehensive understanding regarding the structural factors that dictate the properties of polymers for application in aqueous-based OECTs. A combination of electrochemical, spectroscopic, and X-ray techniques are used to probe the redox response, capacitance, thin film microstructure, and associated performance metrics in two distinct classes of materials: conventional polythiophenes (PTs) and poly(3,4-propylenedioxythiophenes) (PProDOTs).\u0026nbsp; In a family of PTs, the length and substitution pattern of the ethylene glycol-based side chain is found to drastically impact the properties of the active materials. Meanwhile, the properties of polar-functionalized PProDOTs are found to be remarkably less sensitive to side chain length. This work demonstrates the balance of material characteristics that must be achieved for maximal performance. The cumulative results indicate that underlying structure-property trends in OECT channel materials cannot be generalized across material classes.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFinally, this research utilizes a novel application of \u003Cem\u003Ein situ\u003C\/em\u003E specular neutron reflectivity to track actuation and electrolyte uptake in PProDOTs while electrochemically doping in aqueous media. Contrast-matching methods reveal that electrolyte irreversibly penetrates the polymer film, even prior to application of an electrochemical bias. Physical insights provided by the neutron reflectivity shed light on the diffusional limitations associated with the electrochemical doping reaction. Such work sets a precedent for using neutron-based techniques to study the redox dynamics of electroactive polymers in a more general sense.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Establishing Design Principles for Polythiophenes Used in Electrochemical Applications"}],"uid":"27707","created_gmt":"2020-11-06 20:41:37","changed_gmt":"2020-11-06 20:41:37","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2020-11-20T12:30:00-05:00","event_time_end":"2020-11-20T14:30:00-05:00","event_time_end_last":"2020-11-20T14:30:00-05:00","gmt_time_start":"2020-11-20 17:30:00","gmt_time_end":"2020-11-20 19:30:00","gmt_time_end_last":"2020-11-20 19:30:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}