The development of hybrid sol-gel nanoparticles (NPs) has played a central role in advancing the additive manufacture, or 3D printing, of glass materials in geometries and compositions unimaginable by conventional melt quench techniques. In this presentation, we investigate how hybrid NP morphology influences glass-network formation towards improving precursor design and ultimately enabling the development of new glass systems. Our study explores three unique NP systems: (1) a mixture of encapsulated GeO2-SiO2 and SiO2 NPs, (2) a mixture of independent GeO2 and SiO2 NPs, and (3) independent GeO2-SiO2 NPs. NP shape, size, and morphology were analyzed using electron microscopy and atomic force microscopy. The chemical composition of the NPs was probed by energy-dispersive X-ray spectroscopy Raman and Fourier-transform infrared spectroscopies were used to study chemical structures and bonding in the resulting NPs and glass networks. Initial findings from group (1) glasses suggest these methods can identify sub-micron Ge speciation and glass phase separation. Ongoing studies will seek to apply these methods to the other NP systems.

Network evolution and chemical speciation in glass materials derived from hybrid sol-gel nanoparticles

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ACS Fall 2022

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