{"391251":{"#nid":"391251","#data":{"type":"event","title":"Ph.D. Thesis Defense by Stephanie L. Chinnapongse Cates","body":[{"value":"\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003ESchool of Civil and Environmental Engineering\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u0026nbsp;Ph.D.\u0026nbsp;Thesis Defense Announcement\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003E\u0026nbsp;Visible to UV\u0026nbsp;Upconversion\u0026nbsp;Materials for Surface Disinfection and\u0026nbsp;Photocatalyst\u0026nbsp;Sensitization\u003C\/strong\u003E\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u0026nbsp;by:\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003EStephanie L.\u0026nbsp;Chinnapongse\u0026nbsp;Cates\u003C\/strong\u003E\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u0026nbsp;\u003Cstrong\u003EAdvisor:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003EDr.\u0026nbsp;Jaehong\u0026nbsp;Kim (CEE)\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003ECommittee Members:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003EDr. John\u0026nbsp;Crittenden\u0026nbsp;(CEE); Dr. Ching-Hua Huang (CEE); Dr. Angus Wilkinson (CHEM), Dr.\u0026nbsp;Sotira\u0026nbsp;Yiacoumi\u0026nbsp;(CEE)\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003EDate \u0026amp; Time:\u003C\/strong\u003E\u0026nbsp;April 3\u0026nbsp;@ 11:00am\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003ELocation:\u003C\/strong\u003E\u0026nbsp;\u0026nbsp;Mason 3133\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EUV radiation is utilized in a number of environmental technologies, most notably for the disinfection of water, air, and surfaces through the use of UVC fluorescent lamps. Recently, our group developed a luminescent material that could emit germicidal UVC simply by irradiating it with a household fluorescent lamp, thus introducing a new type of antimicrobial surface powered by low-intensity visible light. The materials were doped with praseodymium ions (Pr3+) which have the unique capability of converting visible light to higher energy UV using an optical mechanism called upconversion. While visible-to-UV upconversion materials appeared promising for environmental application --particularly because solar irradiation could be used for their activation --their practical application was thwarted by low light conversion efficiencies. Herein we discuss the pursuit of new material forms and modifications designed to improve the efficiency of Pr3+-based upconversion systems. These enabled successful enhancement of antimicrobial activity and led to a proof of concept for upconversion-sensitized TiO2\u0026nbsp;photocatalysis. Correlations between material properties and optical behavior will be presented, followed by commentary on how these strategies might be used to further advance upconversion systems toward environmental application.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Visible to UV Upconversion Materials for Surface Disinfection and Photocatalyst Sensitization"}],"uid":"28077","created_gmt":"2015-03-27 12:07:18","changed_gmt":"2016-10-08 01:49:08","author":"Danielle Ramirez","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2015-04-03T12:00:00-04:00","event_time_end":"2015-04-03T14:00:00-04:00","event_time_end_last":"2015-04-03T14:00:00-04:00","gmt_time_start":"2015-04-03 16:00:00","gmt_time_end":"2015-04-03 18:00:00","gmt_time_end_last":"2015-04-03 18:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"1808","name":"graduate students"},{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}