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Updated: Jul 14, 2026

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica
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Probing Interactions between Confined Ionic Liquids and Mesoporous Silica Using X-ray Photoelectron Spectroscopy.

Andrew Drake1, Yuxin He1, Folami Ladipo2

  • 1Department of Chemical and Materials Engineering, University of Kentucky, 177 F.P. Anderson Tower, Lexington, Kentucky 40506, United States.

The Journal of Physical Chemistry. B
|September 12, 2025
PubMed
Summary

X-ray photoelectron spectroscopy revealed how ionic liquids interact within nanoconfined silica pores. Pore size and functionalization significantly influence ionic liquid speciation and binding at the interface.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Ionic liquids (ILs) confined in nanoporous materials are promising for catalysis and separations.
  • Understanding the interfacial behavior of ILs within these confined spaces is crucial for optimizing their performance.
  • Mesoporous silica thin films offer tunable pore sizes and surface chemistry for studying confinement effects.

Purpose of the Study:

  • To investigate the interfacial structure and local environment of nanoconfined ionic liquids within mesoporous silica thin films.
  • To examine the influence of pore size (3.5 nm and 8.5 nm) and surface functionalization on ionic liquid behavior.
  • To elucidate the interactions between the ionic liquid 1-butyl-3-methylimidazolium chloride and the silica pore walls using XPS.

Main Methods:

  • Synthesis of mesoporous silica thin films with vertically aligned pores via dip-coating.
  • Characterization of thin film structure using grazing-incidence small-angle X-ray scattering (GISAXS).
  • Investigation of ionic liquid loading and interfacial interactions using X-ray photoelectron spectroscopy (XPS) with selective etching.

Main Results:

  • XPS analysis confirmed IL loading within silica pores, revealing a local environment comprising both silica and bulk IL.
  • A unique shielded nitrogen peak indicated strong binding of the imidazolium ring to the pore wall.
  • Chlorine speciation was dependent on pore size and surface functionalization, with smaller pores and functionalized surfaces showing similar chloride behavior.

Conclusions:

  • XPS is effective in probing interfacial interactions between low-vapor-pressure solvents and nanoporous supports.
  • The study provides insights into cation-anion electronic environments at the IL-silica interface.
  • Findings advance the rational design of confined ILs for applications in catalysis and separations.