BEGIN:VCALENDAR METHOD:PUBLISH PRODID:www-ww-tf-fau-eu//Events//EN VERSION:2.0 BEGIN:VEVENT SUMMARY:WW Colloquium: Prof. Dr. Patricia Kooyman - Transmission elect ron microscopy in catalysis research - from ex situ to operando UID:040000008200E00074C5B7101A82E008000000000099FEC7A436DC010000000000 000000100000004DFDE6C1E27F3C4BAEA28E13E1200BCF DESCRIPTION:Prof. Dr. Patricia Kooyman Catalysis Institute\, Universit y of Cape Town\, Rondebosch\, South Africa Transmission electron micro scopy in catalysis research –\; from ex situ to operando TEM is t raditionally a high vacuum (10-6 Torr) technique\, which offers atomic resolution imaging of a whole range of materials. Although a lot of u seful information can be obtained from ex situ imaging\, many material s have a different (surface) structure at elevated temperature as oppo sed to room temperature\, and in vacuum as opposed to gaseous environm ent. The specific gas present can even influence the structure of a ma terial. This means that traditional TEM images are mostly obtained of materials that are NOT in the state in which they are used in practice . One important area of application is catalysis research. The develop ment of differentially pumped ETEM was a significant step in the direc tion of real in situ TEM\, allowing gas pressures of up to 50 mbar and heating up to about 1000 °C. We have developed a micro-electro-mecha nical system (MEMS) nanoreactor to bridge the pressure gap. It confine s a thin layer of gas (several microns) in a windowed cell\, thus reta ining atomic resolution at pressures exceeding 1 bar by limiting the p ath length of gas the electron have to traverse. The catalyst under st udy (or its precursor) can be loaded into the nanoractor prior to the experiments. Small electron-transparent windows provide both good tran smission of the electron beam and stability against the pressure diffe rence. Heating is possible up to about 1000 °C. New developments incl ude incorporation of a light source to study photocatalytic reactions. Bernhard-Ilschner-lecture hall (H14) Martensstr. 5-7\, Erlangen or Zo om: Meeting-ID: 633 2071 1359 or zoom code: 380698 DTSTART:20251014T140000Z DTEND:20251014T160000Z LOCATION:H14 / Zoom DTSTAMP:20260414T112307Z END:VEVENT END:VCALENDAR