Multicomponent oxide microspheres with designed macroporosity (MICROSCAFS®): a customized platform for chemicals...

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Developing advanced materials with controlled porosity is crucial for applications like environmental remediation.
• Existing methods often require specific additives or porogens, limiting reproducibility and versatility.

Purpose of the Study:

• To present a novel, versatile, and recyclable material platform based on multicomponent oxide microspheres.
• To investigate the synthesis and properties of these microspheres, termed MICROSCAFS®.
• To establish a base for consistent custom production of MICROSCAFS® for diverse applications.

Main Methods:

• Emulsion templating combined with an adapted sol-gel technique involving polymerization-induced phase separation by spinodal decomposition.
• Cryo-scanning electron microscopy (cryo-SEM) for formation mechanism insights.
• X-ray computed tomography (CT) for porosity and morphological analysis.

Main Results:

• Successfully synthesized multicomponent oxide microspheres (silica-titania and silica-titania-hafnia) with tailored interconnected macroporosity (MICROSCAFS®).
• Demonstrated that silicon precursor composition significantly influences pore size (nanometer to micron scale).
• Correlated mechanical properties with morphology, showing higher macroporosity leads to increased elastic recovery and compressibility.

Conclusions:

• The developed method allows for reproducible synthesis of MICROSCAFS® without specific gelation additives or porogens.
• The material platform shows potential for environmental remediation and other emerging applications.
• The study provides a foundation for designing custom MICROSCAFS® with tunable properties.