BEGIN:VCALENDAR VERSION:2.0 METHOD:PUBLISH PRODID:-//Missouri State University/Calendar of Events//EN CALSCALE:GREGORIAN X-WR-TIMEZONE:America/Chicago BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 DTSTART:20070311T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU TZNAME:CDT END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 DTSTART:20071104T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:bc7e2930-2a11-473c-b7de-9c3c17fdfae6.234005@calendar.missouristate.edu CREATED:20240124T151344Z LAST-MODIFIED:20240124T151344Z LOCATION:Meyer Library\, Duane G. 101 SUMMARY:Chemistry & Biochemistry Seminar: "Imaging Nanoporous Particles fo r Chemical Separations" DESCRIPTION:Presenter: Dr. Max Lei Geng - University of Iowa\n\n\nAbstract \n\n\nChromatography separations involve chemical and physical processes that cover a wide range of time scales\, from molecular diffusion and ads orption at microsecond time scale\, to the gradual structural\, chemical and physical changes in the chromatography materials at a time scale of h ours. These changes result in a degradation in separation capacity\, sele ctivity and throughput over time\, but the molecular origins of these cha nges are not understood.\n\n\nWe have developed multiscale imaging method s\, from microsecond time resolution up to hours\, to visualize chromatog raphy separation and to investigate these fundamental processes. Molecula r diffusion and adsorption are studied through imaging fluorescence corre lation spectroscopy to generate images of diffusion rates and adsorption kinetics inside the stationary phase particles. To investigate the fundam ental origins for the changes in the particles over time after hundreds o f separations have been performed by the column\, we imaged the free ener gy of interactions over equivalent of 1\,000 injections through the packi ng. These imaging methods provide direct information on the fundamental m olecular processes central to chromatography separations. X-ALT-DESC;FMTTYPE=text/html:<html><head><title></title></head><body><p>Pr esenter: Dr. Max Lei Geng - University of Iowa</p>\n<p><b><span>Abstract< /span></b><span></span></p>\n<p><span>Chromatography separations involve chemical and physical processes that cover a wide range of time scales\, from molecular diffusion and adsorption at microsecond time scale\, to th e gradual structural\, chemical and physical changes in the chromatograph y materials at a time scale of hours. These changes result in a degradati on in separation capacity\, selectivity and throughput over time\, but th e molecular origins of these changes are not understood.</span><span></sp an></p>\n<p><span>We have developed multiscale imaging methods\, from mic rosecond time resolution up to hours\, to visualize chromatography separa tion and to investigate these fundamental processes. Molecular diffusion and adsorption are studied through imaging fluorescence correlation spect roscopy to generate images of diffusion rates and adsorption kinetics ins ide the stationary phase particles. To investigate the fundamental origin s for the changes in the particles over time after hundreds of separation s have been performed by the column\, we imaged the free energy of intera ctions over equivalent of 1\,000 injections through the packing. These im aging methods provide direct information on the fundamental molecular pro cesses central to chromatography separations.</span><span></span></p></bo dy></html> DTSTART;TZID=America/Chicago:20240207T153500 DTEND;TZID=America/Chicago:20240207T162500 SEQUENCE:0 URL:https://chemistry.missouristate.edu/Seminars.htm CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students,Staff END:VEVENT END:VCALENDAR