In situ SAXD studies on phenylene- and thiophene-bridged periodic mesoporous organosilicas (PMOs)

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Erscheinungsjahr:
2010
Medientyp:
Text
Schlagworte:
  • Mesoporous materials
  • Silica
  • Mesoporous organosilicas
  • Catalysts
  • Zeolites
  • Hydrogenation
  • Mesoporous materials
  • Silica
  • Mesoporous organosilicas
  • Catalysts
  • Zeolites
  • Hydrogenation
Beschreibung:
  • In situ small-angle X-ray diffraction (SAXD) investigations are carried out in order to obtain an insight into the formation process of 2D hexagonal ordered phenylene- and thiophene-bridged periodic mesoporous organosilicas (PMOs) synthesized with Brij 76 (polyethylene (10) stearylether). The reaction solution is investigated by pumping it through a capillary placed in a synchrotron radiation beam. Data collection is stopped when the growing particle size lead to an irregular flow of the solution. The resulting data is compared with powder X-ray diffraction of the samples synthesized in the laboratory. The 2D hexagonal ordered PMO products synthesized with Brij 76 are formed via a metastable three-dimensional hexagonal ordered transition state. Here, we describe the formation process of the PMO materials regarding the properties of the structure-directing agent. © 2010 American Chemical Society.
Lizenz:
  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/d82c29fe-1318-4799-838b-560210878d2f