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Textural control of ionosilicas by ionic liquid templating.

Nicole Abdou1, Philippe Dieudonné-George2, Nicolas Brun1

  • 1ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France. peter.hesemann@umontpellier.fr.

Physical Chemistry Chemical Physics : PCCP
|September 6, 2022
PubMed
Summary

Ionic liquids (ILs) are effective soft templates for creating mesoporous ionosilica materials. The type and amount of IL used precisely control the resulting material

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Ionic liquids (ILs) exhibit unique self-assembly properties, making them suitable as soft templates for mesoporous material synthesis.
  • Ionosilicas, functional materials with covalently immobilized ionic building blocks in a silica matrix, show promise in water treatment, separation, and drug delivery.

Purpose of the Study:

  • To report a straightforward method for forming mesoporous ionosilica phases using ionic liquids as soft templates.
  • To investigate the influence of ionic liquids on the textural properties of mesoporous ionosilica.

Main Methods:

  • Non-hydrolytic sol-gel procedures were employed in the presence of ionic liquids.
  • The textural properties of the resulting ionosilica phases were analyzed using nitrogen sorption, small-angle X-ray scattering (SAXS), and electron microscopy (TEM, SEM).

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Main Results:

  • Mesoporous ionosilica phases were successfully formed using ionic liquids as soft templates.
  • The study demonstrated a high affinity between ILs and silylated ionic precursors, facilitating the templating process.
  • Textural characteristics, including surface area, pore size, pore size distribution, and connectivity, were effectively controlled by the choice and concentration of the ionic liquid.

Conclusions:

  • Ionic liquids are versatile and efficient soft templates for the controlled synthesis of mesoporous ionosilica.
  • The ionothermal sol-gel procedure offers a reproducible method for tailoring ionosilica properties for various applications.