Glasses, Optical Materials, and Devices: Current Issues in Science & Technology: Poster Ssession
Program Organizers: Jincheng Du, University of North Texas; S. Sundaram, Alfred University

Tuesday 11:00 AM
October 1, 2019
Room: Exhibit Hall CD
Location: Oregon Convention Center

P1-21: Characterization of Potentially Antibacterial Glass Powders Prepared by Zn2+ Ion Exchange: Duygu Güldiren1; İpek Erdem2; Caner Kuzu2; Suheyla Aydin2; 1Şişecam Science, Technology and Design Center; 2Istanbul Technical University
    In recent years, bulk or powdered glasses showing antibacterial property have become highly applicable in textiles, cosmetics, touch screens, surface coverings, hospital appliances, biomaterials etc. Metal ions used for such purposes are mainly silver, zinc and copper. Besides silver, zinc is one of the metals known its antimicrobial properties against different bacteria and fungi species. In this study, it was aimed to prepare zinc containing soda-lime silicate glass powder via ion exchange process. For this purpose, powdered Corning® 2947 glass with maximum particle size of 75 m was submitted to ion exchange process using Zn(NO3)2 - NaNO3 salt bath with varying amounts of Zn(NO3)2 at varying temperature and time. Zinc incorporation into the glass was realized by using atomic absorption spectroscopy (AAS) analysis, possible phase formations after the ion exchange treatment was determined by X-ray diffraction (XRD) technique, ion releasing ability which indicates a potential antibacterial behavior was studied.

P1-22: Effect of Al2O3:K2O Ratio on Sintering and Crystallization Behaviour of Lithium Dislicate Glass Ceramics: Santa Kolay1; Parag Bhargava1; 1IIT Bombay
     Among various glass ceramics systems Lithium disilicate glass ceramics have been accepted as significantly important material due to its good crystallization ability, flexural strength, fracture toughness, translucenct properties which made them suitable for a wide range of different applications viz. dental restoration, electrical insulation, transparent glass ceramic armour etc. Among many other factors, Al2O3:K2O ratio of glass composition plays an important role to vary the crystallization behaviour, microstructure and densification of lithium disilicate based glass ceramics. Our present study aims toward investigating the effect of Al2O3/K2O ratio on sintering and crystallization behaviour in a SiO2-Li2O-Al2O3-K2O-MgO-ZnO-ZrO2-P2O5 glass system. The glasses were characterized by using MAS-NMR spectroscopy. Sintering and crystallization behaviour of the glass ceramics was characterized by using XRD, SEM and DTA. Mechanical property was characterized by Vickers microhardness.Keywords: Lithium disilicate, glass ceramics, sintering, crystallization