Macroporosity Control by Phase Separation in Sol-Gel Derived Monoliths and Microspheres

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Macroporous and hierarchically macro/mesoporous materials are vital for diverse applications including chromatography, energy storage, catalysis, biomedical devices, drug delivery, and environmental remediation.
• The sol-gel technique, combined with spinodal decomposition and emulsification, is a successful method for creating these tailored porous materials, particularly microspheres.

Purpose of the Study:

• This review discusses the evolution of synthesis methodologies and material design for macroporous and hierarchically porous materials.
• The goal is to inspire new advancements in the synthesis and application of these materials, especially for emerging fields like photocatalysis.

Main Methods:

• The review focuses on sol-gel techniques, phase separation via spinodal decomposition, and emulsification as a soft templating method.
• Advancements in synthesis using alkoxides or metal-salts are highlighted, alongside strategies for material design.

Main Results:

• Significant progress has been made in optimizing synthesis methodologies for porous materials.
• Material design strategies, including grafting or immobilizing specific species or nanoparticles, are enabling cutting-edge applications such as photocatalysis.

Conclusions:

• The review provides a comprehensive overview of the progress in macroporous and hierarchically porous materials.
• Continued evolution in material composition and synthesis strategies is expected to drive breakthroughs in technological applications.