Optimizing surfactant removal from a soft-templated ordered mesoporous carbon precursor: an in situ SAXS study

Max Rauscher, Malina Seyffertitz, Richard Kohns, Sebastian Stock, Heinz Amenitsch, Nicola Huesing, Oskar Paris

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

In situ small-angle X-ray scattering (SAXS) was employed to identify critical parameters during thermal treatment for template removal of an ordered mesoporous carbon precursor synthesized via a direct soft-templating route. The structural parameters obtained from the SAXS data as a function of time were the lattice parameter of the 2D hexagonal structure, the diameter of the cylindrical mesostructures and a power-law exponent characterizing the interface roughness. Moreover, detailed information on contrast changes and pore lattice order was obtained from analysis of the integrated SAXS intensity of the Bragg and diffuse scattering separately. Five characteristic regions during heat treatment were identified and discussed regarding the underlying dominant processes. The influence of temperature and O2/N2 ratio on the final structure was analyzed, and parameter ranges were identified for an optimized template removal without strongly affecting the matrix. The results indicate that the final structure and controllability of the process are optimum for temperatures between 260 and 300°C with a gas flow containing 2 mol% of O2.
OriginalspracheEnglisch
Seiten (von - bis)801-809
Seitenumfang8
FachzeitschriftJournal of applied crystallography
Jahrgang56.2023
Ausgabenummer3
DOIs
PublikationsstatusVeröffentlicht - 2 Mai 2023

Schlagwörter

  • SAXS
  • In Situ Behandlung
  • carbon
  • Mesoporous carbon
  • calcination
  • ordered mesoporous carbon

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