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Silica-Encapsulated Germania Colloids as 3D-Printable Glass Precursors.

Alexandra C Chinn1, Eric L Marsh1, Tim Nguyen1

  • 1Department of Chemistry & Biochemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States.

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|June 1, 2022
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Summary

Core-shell germania-silica colloids were developed for 3D printing. This novel approach enables the fabrication of optically transparent germanium-doped silica glasses with enhanced precision.

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Glass Science

Background:

  • Core-shell colloids offer precise control over precursor dimensions and compositions for advanced materials.
  • Three-dimensional (3D) printing of mixed oxide glasses requires sophisticated precursor design for improved fabrication precision.

Purpose of the Study:

  • To design and utilize core-shell germania-silica (GeO2-SiO2) colloids as precursors for 3D printing GeO2-SiO2 glass monoliths.
  • To demonstrate the feasibility of direct ink write (DIW) 3D printing using these novel colloidal precursors.

Main Methods:

  • Synthesis of GeO2 colloids via sol-gel chemistry, forming raspberry-like agglomerates.
  • Encapsulation of GeO2 cores with an SiO2 shell to create core-shell GeO2-SiO2 colloids.
  • Formulation of colloidal sols into a viscous ink for DIW 3D printing and subsequent sintering to form glass monoliths.

Main Results:

  • Successfully fabricated optically transparent low wt % GeO2-SiO2 glasses using the DIW 3D printing method.
  • Characterization confirmed the quality and optical transparency of the resulting glasses.
  • Demonstrated a novel hybrid colloid approach for fabricating 3D-printed Ge-doped silica glass.

Conclusions:

  • Core-shell GeO2-SiO2 colloids provide a viable route for producing high-quality, transparent GeO2-SiO2 glasses via 3D printing.
  • This method enhances precision in glass fabrication and offers a new pathway for creating complex glass structures.
  • The study highlights the potential of advanced colloidal precursors in additive manufacturing of functional glasses.