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Optimizing surfactant removal from a soft-templated ordered mesoporous carbon precursor: an

Max Valentin Rauscher1, Malina Seyffertitz1, Richard Kohns2

  • 1Chair of Physics, Department Physics, Mechanics and Electrical Engineering, Montanuniversität Leoben, Leoben, Austria.

Journal of Applied Crystallography
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PubMed
Summary

This study used in situ small-angle X-ray scattering (SAXS) to optimize thermal template removal for ordered mesoporous carbon. Optimal conditions involve temperatures of 260-300°C and 2% O2 for preserving structure.

Keywords:
calcinationin situ small-angle X-ray scatteringordered mesoporous carbonssoft-templated carbons

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Ordered mesoporous carbons are crucial materials for catalysis and energy storage.
  • Controlling their structure during synthesis and post-processing is essential for performance.
  • Template removal via thermal treatment is a critical step that can alter material properties.

Purpose of the Study:

  • To investigate the structural evolution of ordered mesoporous carbon during thermal template removal.
  • To identify critical parameters influencing the process and final material structure.
  • To establish optimal conditions for template removal without compromising the carbon matrix.

Main Methods:

  • In situ small-angle X-ray scattering (SAXS) was utilized to monitor structural changes over time.
  • Analysis focused on lattice parameter, mesostructure diameter, and interface roughness.
  • Integrated SAXS intensity was analyzed to assess contrast and pore lattice order.

Main Results:

  • Five distinct regions of structural evolution during heat treatment were identified.
  • The influence of temperature and oxygen concentration on structural integrity was quantified.
  • Optimal template removal was achieved between 260-300°C with 2 mol% O2.

Conclusions:

  • In situ SAXS provides critical insights into the dynamic processes of thermal template removal.
  • Precise control over temperature and oxygen content is vital for preserving the ordered mesoporous carbon structure.
  • The identified optimal conditions ensure efficient template removal while maintaining desired material characteristics.