A New Framework for 3D Printing Aerogels with Additives: Hardware and Ink Development

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• 3D printing enables custom material fabrication.
• Aerogels offer unique properties but are challenging to print.
• Incorporating nanoparticles enhances aerogel functionality.

Purpose of the Study:

• To develop a 3D printing method for titanium dioxide (TiO2) nanoparticle-infused aerogels.
• To optimize aerogel ink formulation for precise printing.
• To explore applications in photocatalysis and environmental remediation.

Main Methods:

• Adapted a commercial 3D printer with a custom syringe pump for aerogel ink extrusion.
• Formulated a shear-thinning silica aerogel ink with homogeneous TiO2 nanoparticle dispersion (50 wt %).
• Utilized ammonia vapor gelation and supercritical CO2 drying for postprocessing.

Main Results:

• Achieved 3D printing of aerogel structures with <1 mm precision.
• Fabricated aerogels with high specific surface area (407 m²/g) and low density (0.15 g/cm³).
• Demonstrated shear-thinning behavior (viscosity drop from 10,000 Pa·s to 1 Pa·s) for smooth extrusion.

Conclusions:

• Developed a scalable and cost-effective 3D printing approach for functional aerogels.
• The TiO2-infused aerogels show promise for catalysis, thermal insulation, and environmental remediation.
• This methodology allows for tailored aerogel properties through precise structural control.