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SUMMARY:WW Kolloquium: Prof. Dr. Patricia Kooyman - Transmission elect
 ron microscopy in catalysis research – from ex situ to operando
UID:040000008200E00074C5B7101A82E0080000000060298461A436DC010000000000
 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 tradit
 ionally a high vacuum (10-6 Torr) technique\, which offers atomic reso
 lution imaging of a whole range of materials. Although a lot of useful
  information can be obtained from ex situ imaging\, many materials hav
 e a different (surface) structure at elevated temperature as opposed t
 o room temperature\, and in vacuum as opposed to gaseous environment. 
 The specific gas present can even influence the structure of a materia
 l. This means that traditional TEM images are mostly obtained of mater
 ials that are NOT in the state in which they are used in practice. One
  important area of application is catalysis research. The development 
 of differentially pumped ETEM was a significant step in the direction 
 of real in situ TEM\, allowing gas pressures of up to 50 mbar and heat
 ing up to about 1000 °C. We have developed a micro-electro-mechanical
  system (MEMS) nanoreactor to bridge the pressure gap. It confines a t
 hin layer of gas (several microns) in a windowed cell\, thus retaining
  atomic resolution at pressures exceeding 1 bar by limiting the path l
 ength of gas the electron have to traverse. The catalyst under study (
 or its precursor) can be loaded into the nanoractor prior to the exper
 iments. Small electron-transparent windows provide both good transmiss
 ion of the electron beam and stability against the pressure difference
 . Heating is possible up to about 1000 °C. New developments include i
 ncorporation of a light source to study photocatalytic reactions. Bern
 hard-Ilschner-lecture hall (H14) Martensstr. 5-7\, Erlangen or Zoom: M
 eeting-ID: 633 2071 1359 or zoom code: 380698
DTSTART:20251014T160000Z
DTEND:20251014T180000Z
LOCATION:H14 / Zoom
DTSTAMP:20260414T113356Z
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