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:ebb101e5-2399-4941-a88b-02779cc2b7a4.215738@calendar.missouristate.edu CREATED:20210225T230206Z LAST-MODIFIED:20210225T230206Z LOCATION:Passcode: chm700 SUMMARY:Chemistry Seminar - Dr. Aaron Rossini DESCRIPTION:Sensitizing Solid-State NMR Spectroscopy for the Atomic Level Characterization of Surfaces\n\n\nThe atomic level characterization of su rfaces and interfaces is an unresolved scientific challenge. Solid-state nuclear magnetic resonance (NMR) spectroscopy could be an ideal probe of atomic level structure for surfaces since it can be applied to both order ed and disordered materials. Solid-state NMR spectroscopy also offers unp aralleled selectivity\; it is possible to selectively detect signals from surfaces and interfaces\, perform spectral editing on the basis of spin couplings and address nearly all of the elements in the periodic table. H owever\, NMR spectroscopy suffers from intrinsically poor sensitivity tha t limits or prevents its application\, as is the case when the species of interest are very dilute\, relaxation times are unfavorable\, the nuclei under study are unreceptive\, or other mechanisms reduce sensitivity. \n \n\nIn this talk\, I will describe how the state of the art NMR technolog ies of fast magic angle spinning (MAS) or dynamic nuclear polarization (D NP) can be used to enhance the sensitivity of solid-state NMR experiments by orders of magnitude. I will give examples of how these techniques ena ble the characterization of the surfaces of semiconductor nanoparticles a nd heterogeneous catalysts. Examples of systems we have studied by these approaches include silicon\, cadmium sulfide\, cadmium selenide and cesiu m lead bromide nanoparticles and boron- and platinum-based heterogeneous catalysts. X-ALT-DESC;FMTTYPE=text/html:<html><head><title></title></head><body><p>Se nsitizing Solid-State NMR Spectroscopy for the Atomic Level Characterizat ion of Surfaces</p>\n<p>The atomic level characterization of surfaces and interfaces is an unresolved scientific challenge. Solid-state nuclear ma gnetic resonance (NMR) spectroscopy could be an ideal probe of atomic lev el structure for surfaces since it can be applied to both ordered and dis ordered materials. Solid-state NMR spectroscopy also offers unparalleled selectivity\; it is possible to selectively detect signals from surfaces and interfaces\, perform spectral editing on the basis of spin couplings and address nearly all of the elements in the periodic table. However\, N MR spectroscopy suffers from intrinsically poor sensitivity that limits o r prevents its application\, as is the case when the species of interest are very dilute\, relaxation times are unfavorable\, the nuclei under stu dy are unreceptive\, or other mechanisms reduce sensitivity.&nbsp\;</p>\n <p>In this talk\, I will describe how the state of the art NMR technologi es of fast magic angle spinning (MAS) or dynamic nuclear polarization (DN P) can be used to enhance the sensitivity of solid-state NMR experiments by orders of magnitude. I will give examples of how these techniques enab le the characterization of the surfaces of semiconductor nanoparticles an d heterogeneous catalysts. Examples of systems we have studied by these a pproaches include silicon\, cadmium sulfide\, cadmium selenide and cesium lead bromide nanoparticles and boron- and platinum-based heterogeneous c atalysts.</p></body></html> DTSTART;TZID=America/Chicago:20210303T153500 DTEND;TZID=America/Chicago:20210303T163500 SEQUENCE:0 URL: CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students,Staff END:VEVENT END:VCALENDAR