Glasses and Optical Materials: Current Issues and Functional Applications: Poster Session
Sponsored by: ACerS Basic Science Division, ACerS Glass & Optical Materials Division
Program Organizers: Doris Möncke, Alfred University; Mathieu Hubert, Corning Incorporated
Monday 5:00 PM
October 10, 2022
Room: Ballroom BC
Location: David L. Lawrence Convention Center
D-13: Flow Dissolution of Lithium Disilicate Glass under Aqueous Conditions: Ben Dillinger1; Carlos Suchicital1; David Clark1; 1Virginia Polytechnic Institute and State University
Glass dissolution under flow conditions is an area of research that has mainly focused on the analysis of complex glass. The purpose of this study was to examine flow dissolution on a lithium disilicate glass and compare the results to previous research on complex glass. Experiments using deionized water were conducted for up to two weeks at temperatures of 50°C or 95°C and flow rates of 0.333 mL/min and 1 mL/min. Results showed that the total normalized mass loss for silicon was independent of flow rate while for lithium it increased with decreasing flow rate. These trends are different from what has been previously observed in complex glasses where the total normalized mass loss increased with flow rate before becoming independent. It was thought that the difference in trends was due to the presence of a protective layer on complex glasses which does not occur for lithium disilicate glasses.
D-15: Natural Glasses – Findings from an Undergraduate Project: Kenneth Berlin1; Doris Möncke1; Jessica Domino1; Lucas Greiner1; 1Alfred University
A series of natural glasses, ranging from volcanic glass (obsidians, pumice), the skeleton of a deep-sea sponge, to glasses formed by lightning strikes (fulgurites) or impacts (tektites), and even amber, were studied for variations in their composition, transition temperature, amorphous nature and structure. This project resulted from an interdisciplinary elective for students from Engineering, Art, Science and Geology, including first year students to seniors, which had the opportunity to melt glasses and to use various characterization methods from SEM to spectroscopy, DSC to XRD. Some students opted for a deeper literature review, while others had a more practical approach, including the remelting of space glass, using a composition found on Mars. This class will likely turn into a regular elective offered by the School of Engineering, and more detailed results can be expected.
Cancelled
D-16: Studying the Scratch-induced Damage of Graphene-coated Silica Glass by Molecular Dynamics Simulations: Sourav Sahoo1; Utkarsh Tiwari1; Romit Kaware1; Sajid Mannan1; Nitya Gosvami1; N. M. Anoop Krishnan1; 1Indian Institute of Technology (IIT) Delhi
Glass surfaces are highly susceptible to scratch-induced damages, which primarily depend on the friction between the glass and rigid countersurfaces. A possible approach for minimizing such deformations is to deposit thin lubricious coatings over the glass substrate. To this extent, the scratch damage of graphene-coated silica glass against a spherical diamond indenter with Molecular Dynamics (MD) method is reported. The graphene-coated silica glass exhibits a significant reduction in the frictional forces compared to the bare glass surface, implying reduced severity of sliding. The coordination number analysis of the silica glass reveals a considerable reduction in the damage layer thickness beneath the indenter sliding over graphene coating. The structure of the scratched glass is further probed to evaluate the bond angle, intermediate ring, and defect distributions and correlated with the deformation mechanisms. The results provide new insights into the reduced scratch damage of glasses with protective 2-D graphene coatings.
D-17: Sulfur Blue Glasses - S3- Anion Charge Transfer Transitions: Lucas Greiner1; Jacob Kaspryk1; Doris Möncke1; 1Alfred University
Ultramarine, the intense anion-to-anion charge transfer transitions within a sulfur cluster, gives Lapis Lazuli its typical deep blue color. In ancient times “lapis lazuli from the fire” refers to cobalt blue silicate glasses, however, low basicity phosphate and borate glasses may also stabilize sulfur clusters. Focusing first on phosphate glasses, we looked for low basicity compositions with high field strength cations in order to identify a chemically stable composition that shows the blue color of these S3- clusters. UV-Vis-NIR spectroscopy shows the typical absorption band with a maximum at 578 nm, Photoluminescence spectra saw a red fluorescence with an emission maximum near 666 nm when excited at 420 nm. The extra electron of the S3- clusters was also confirmed by Paramagnetic Resonance (EPR) spectroscopy.
D-18: Tungsten Borate – A Replacement for Lead in Glass: Elizabeth Tsekrekas1; Alexis Clare1; 1Alfred University
Heavy metal oxide glasses are often of great interest for their ability to be used as an alternative to lead-based glasses, and example of which is radiation shielding applications. In addition, it is desirable to find suitable applications for recycled lead-based glasses to reduce the production of new glasses. In a twofold-effort to find a replacement for lead and an application for recycled lead, glass microspheres from ternary tungsten borate systems and recycled lead glass were produced and compared. To create microspheres, glasses were crushed into small frit and fed into a propane/oxygen torch. Microsphere size and shape were analyzed through the use of a SEM. Raman spectroscopy was preformed on the glass to determine structural units within the network. In addition, physical, thermal, and optical properties were measured and compared between the fabricated ternary tungsten borate and recycled lead glasses.
D-19: Unusual High Oxidation States of Transition Metal Ions in Silicate Glasses of High Optical Basicity: Trivalent Co3+ and Ni3+: Lucas Greiner1; Jacob Kaspryk1; Randall Youngman2; Alix Clare1; Doris Möncke1; 1Alfred University; 2Corning Inc.
Atypical high oxidation states of transition metal ions have been successfully stabilized in the Cs2O-BaO-SiO2 metasilicate glass system of extremely high optical basicity (Λ=0.73-0.85). These glasses were prepared via traditional melt-quenching and analyzed directly after preparation. Previous solarization experiments in silicates and borosilicate glasses where Co2+ and Ni2+ are tetrahedrally coordinated showed that Co3+ (d6) and Ni3+ (d7+) can form by photo-oxidation under high energy irradiation by UV light or X-rays. The spectral parameter of trivalent Co and Ni ions in glasses were determined by UV-Vis and electron paramagnetic resonance (EPR) spectroscopy and compared with reference materials. Overlapping of optical bands of divalent and trivalent ions, of octahedral and tetrahedral coordination complicates the analysis.