TY - JOUR
T1 - Silica-Encapsulated Germania Colloids as 3D-Printable Glass Precursors
AU - Chinn, Alexandra C.
AU - Marsh, Eric L.
AU - Nguyen, Tim
AU - Alhejaj, Zackarea B.
AU - Butler, Matthew J.
AU - Nguyen, Bachtri T.
AU - Sasan, Koroush
AU - Dylla-Spears, Rebecca J.
AU - Destino, Joel F.
N1 - Funding Information:
XRD and XPS experiments were performed at the Nebraska Nanoscale Facility: National Nanotechnology Coordinated Infrastructure and the Nebraska Center for Materials and Nanoscience, which are supported by the National Science Foundation under Award ECCS: 2025298, and the Nebraska Research Initiative. The Thermo Phenom Pharos SEM was acquired through a Nebraska EPSCoR MRI award to J.F.D.
Funding Information:
This work was supported by the Nebraska EPSCoR First Award, the Research Corporation for the Advancement of Science, Cottrell Scholar Award, and in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 within the LDRD program 16-SI-003. Release: LLNL-JRNL-832069. The authors thank the Creighton Haddix STEM Corridor program for supporting the research of Z.B.A., and NASA Nebraska EPSCoR for supporting the research of A.C.C.
Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society.
PY - 2022
Y1 - 2022
N2 - Core-shell colloids make attractive feedstocks for three-dimensional (3D) printing mixed oxide glass materials because they enable synthetic control of precursor dimensions and compositions, improving glass fabrication precision. Toward that end, we report the design and use of core-shell germania-silica (GeO2-SiO2) colloids and their use as precursors to fabricate GeO2-SiO2 glass monoliths by direct ink write (DIW) 3D printing. By this method, GeO2 colloids were prepared in solution using sol-gel chemistry and formed oblong, raspberry-like agglomerates with 15 nm diameter primary particles that were predominantly amorphous but contained polycrystalline domains. An 15 nm encapsulating SiO2 shell layer was formed directly on the GeO2 core agglomerates to form core-shell GeO2-SiO2 colloids. For glass 3D printing, GeO2-SiO2 colloidal sols were formulated into a viscous ink by solvent exchange, printed into monoliths by DIW additive manufacturing, and sintered to transparent glasses. Characterization of the glass components demonstrates that the core-shell GeO2-SiO2 presents a feasible route to prepare quality, optically transparent low wt % GeO2-SiO2 glasses by DIW printing. Additionally, the results offer a novel, hybrid colloid approach to fabricating 3D-printed Ge-doped silica glass.
AB - Core-shell colloids make attractive feedstocks for three-dimensional (3D) printing mixed oxide glass materials because they enable synthetic control of precursor dimensions and compositions, improving glass fabrication precision. Toward that end, we report the design and use of core-shell germania-silica (GeO2-SiO2) colloids and their use as precursors to fabricate GeO2-SiO2 glass monoliths by direct ink write (DIW) 3D printing. By this method, GeO2 colloids were prepared in solution using sol-gel chemistry and formed oblong, raspberry-like agglomerates with 15 nm diameter primary particles that were predominantly amorphous but contained polycrystalline domains. An 15 nm encapsulating SiO2 shell layer was formed directly on the GeO2 core agglomerates to form core-shell GeO2-SiO2 colloids. For glass 3D printing, GeO2-SiO2 colloidal sols were formulated into a viscous ink by solvent exchange, printed into monoliths by DIW additive manufacturing, and sintered to transparent glasses. Characterization of the glass components demonstrates that the core-shell GeO2-SiO2 presents a feasible route to prepare quality, optically transparent low wt % GeO2-SiO2 glasses by DIW printing. Additionally, the results offer a novel, hybrid colloid approach to fabricating 3D-printed Ge-doped silica glass.
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U2 - 10.1021/acsomega.2c02292
DO - 10.1021/acsomega.2c02292
M3 - Article
AN - SCOPUS:85130816549
SN - 2470-1343
JO - ACS Omega
JF - ACS Omega
ER -