Papers by Keyword: Silicate Glass

Abstract: The silicate glass was prepared using rice husk as the source of silica. The base glass formula is composed of SiO₂ (from rice husk ash), Na₂CO₃, K₂CO₃, ZnO, H₃BO₃, CaO and Al₂O₃ or Al. CuO was used as the colorant in the glass matrix in the absence and presence of reducing agent. The color of the glass obtained was varied from dark blue to blue depending on the amount of CuO and reducing agent. The expansion coefficients of copper doped glass are in the range of 12.43 x 10^-6 - 14.35 x 10^-6 (°C^-1) which is common for the silicate glass. The finger prints of the bond vibrations were studied using IR spectroscopy. While the oxidation state and the coordination information of the copper ion in the glass matrix were investigated using X-ray absorption spectroscopy. In the absence and presence of reducing agent, Cu⁺ and Cu²⁺ exist in the glass matrix. However, in the presence of reducing agent, the amount of Cu⁺ in the glass matrix is higher.

Abstract: The silicate glass was prepared using rice husk as the source of silica. The base composition of glass sample was 46SiO₂ (from rice husk ash)-19Na₂CO₃-18H₃BO₃-13ZnO-3CaO-0.9Al₂O₃-0.2Sb₂O₃ mol %. Doping with copper oxide yielded the colored silicate glass. The expansion coefficients of the copper doped glass was 10.76 x 10^-6 K^-1. The finger prints of the bond vibrations were studied using IR spectroscopy. While the oxidation state and the coordination information of the copper ion in the glass matrix were investigated using X-ray absorption spectroscopy. From the data, Cu⁺ and Cu²⁺ exist in the glass matrix.

Abstract: An brief overview of the selected thermo-physical measurements realized in the VILA laboratories for the glass industry and for the fundamental research of glass is presented. Among the routine measurements realized for the glass industry the thermodilatometry for measuring the glass transition temperature, and linear thermal expansion coefficients of glass and metastable glassforming melt are described in detail. The fact that the glass transition temperature is not a single valued physical quantity is stressed in connection with the measurement time temperature schedule. The probably most important quantity related to the glass production technology is the viscosity. Its measurement in the range extending ten orders of magnitude is described. The combination of the falling ball method, the rotation viscosimetry and the thermomechanical analysis is needed to cover the above viscosity range. Among the methods used in the fundamental research of glass structure and properties the study of structural relaxation is overviewed. Here the own method of combined viscous flow and structure relaxation TMA measurement is described in detail.

Abstract: Different ratios of a resorbable phosphate glass (ICEL) and a bioactive silicate glass (CEL2) were co-sintered to obtain 3D porous scaffolds by gel-cast foaming method. The scaffold morphology, crystalline phases and compressive strength were studied. All the scaffolds showed a 3D structure with highly interconnected pores. The ICEL/CEL2 co-sintering resulted in a lower shrinkage leading to higher scaffold porosity (more than 70 vol%) compared to pure ICEL and CEL2 (about 65 vol%). Tuning ICEL/CEL2 ratio allowed the modulation of the scaffold resorption rate, with weight loss ranging from 20% to 75% after soaking for 3 months in simulated body fluid. Scaffolds containing higher amount of CEL2 silicate glass, resulted in a very high bioactivity. In vitro biological test showed no toxic effect of the scaffolds on human osteoblast-like cells.

Abstract: This article discussed the basic theory and routes for preparing soda-lime-silicate glass by filter mud in beet sugar refinery. The proportion of raw materials and processing conditions were optimized.The research shows that amber glass and green-white glass prepared can meet national standards and the technology was reliable, easy, high benefit both on economical and social effects and without secondary waste .

Abstract: Single Bi-doped and M/Bi co-doped silicate glass (M=Al, Y, La) were prepared and broadband NIR emission were observed when the glass samples were pumped by 514 nm and 808 nm LD, respectively. The absorption intensity and emission intensity of the Y/Bi co-doped glass and La/Bi co-doped glass decrease obviously compared to single Bi-doped glass. The absorption intensity in the region of 600-1100 nm and the NIR emission intensity pumped by an 808 nm LD were remarkably enhanced by the introduction of Al₂O₃ into the Bi-doped silicate glass. It is suggested that the Al/Bi co-doped silicate glass might be very useful for broadband fiber amplifiers and widely tunable lasers.

Abstract: To discover the water structure in glass, two silicate glasses were synthesized under different melting atmospheric conditions. Fourier transform infrared spectrometric analyzer was used to study the OH contents and the infrared spectra bands in 1300-4000cm^-1 of the glasses. The research shows that water contents of glass samples melted under air atmosphere and oxyfuel firing atmosphere are 0.0323wt% and 0.0512wt% respectively. The infrared absorptions in 1300-4000cm^-1 band are dominantly related with water dissolved in glass melt. Water existing in glass is mainly in the form of Si-OH, in addition with some free OH connected with metal cations. The IR absorption of ferrous ion in glass is near 3430cm^-1, while the IR absorption near 2500 cm^-1 does not belong to the vibration of KOH.

Abstract: We investigated the crystallization and resulting morphology of a stoichiometric barium-silicate glass 1BaO-2SiO₂ (glassy sanbornite) by using transmission electron microscope and Raman spectroscopy. A crystalline aggregate structure consisting of a Ba₅Si₈O₂₁ phase (trunk) and a β-BaSi₂O₅ phase (branch) was observed in the heat-treated glassy sanbornite. The Ba-richer phase of Ba₅Si₈O₂₁ precipitated prior to the formation of the stoichiometric β-BaSi₂O₅ phase, suggesting the presence of the region in which the Ba ions are enriched or cohesively distributed. A considerable structural similarity between the glassy sanbornite and the Ba₅Si₈O₂₁ phase was also suggested in this study.

Abstract: Silver nanoparticles doped glass composites were prepared by ion-exchange and subsequent thermal treatment processes. The optical properties of silver nanoparticle-glass composites were investigated by UV-VIS spectrophotometer and z-scan technique. The results show that the optimal Ag+/Na+ ion-exchange temperature range is between 310°C and 380°C, higher ion-exchange temperature or higher AgNO3 concentration in melt or longer ion-exchange period favors the introduction of more Ag+ ions into soda lime silicate glasses. The higher Ag+ concentration introduced into silicate glass, the larger the volume fraction of Ag nanoparticles in glass after annealing will be. Ag nanoparticles size and volume fraction become larger with increasing the annealing temperature and extending the annealing time. The off-resonant third-order nonlinear optical susceptibility of Ag nanoparticle-glass composite exhibits a value of 1.16×10-10esu where the real part is -1.15×10-10esu, and imaginary part is 1.4×10-11esu.

Abstract: Photolithographic process is one of the eco-friendly processes for forming the pattern of the barrier ribs in PDP. Controlling the refractive index of glass is important to develop a photosensitive paste for photolithographic process. We studied the refractive index and the structural transition of these glasses by measuring the refractive index, reflectance, density and dielectric constant with changing the SiO2/B2O3 ratio in the SiO2-B2O3-Al2O3 glass system. The refractive index was investigated to the relationship between the thermal and optical properties depending on the composition. It suggests that the thermal and optical properties in borosilicate glasses should be correlated to the glass structure with the SiO2/B2O3 ratio.