glass matrix
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2022 ◽  
Vol 128 (1) ◽  
Author(s):  
Nurul Afiqah Mohamad Yamin ◽  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
Josephine Liew Ying Chyi ◽  
Siti Norul Fadhilah Zalamin ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7425
Author(s):  
Natalia Anna Wójcik ◽  
Polina Sinitsyna ◽  
Sharafat Ali ◽  
Leena Hupa ◽  
Bo Jonson

Sodium-calcium-phosphate based oxynitride glasses and glass-ceramics doped with Mg, Si, and Nb were studied in vitro in simulated body fluid (SBF) under static conditions. The release of ions and pH changes up to 7 days of immersion were investigated. The nitrogen incorporation into phosphate glass matrix was found to notably influence in vitro dissolution only of homogenous glasses. Increasing the nitrogen content in the samples decreased the mean mass loss, while the niobate incorporation increased it. The correlation between the nitrogen content and increase in pH of SBF was also observed. The presence of phosphates crystallites was found to support the dissolution process at the beginning step (up to 3 days).


2021 ◽  
Vol 2086 (1) ◽  
pp. 012129
Author(s):  
A N Babkina ◽  
M S Kovova ◽  
E V Kulpina ◽  
A S Pavliuk ◽  
K S Zyryanova ◽  
...  

Abstract A series of lithium-germanate glasses with different manganese concentration is synthesized. Li2Ge7O15 nanocrystals nucleate in the glass matrix via standard volume crystallization technique thus obtaining lithium-germanate glass-ceramics. The glass-ceramics possess intense emission near 660-670 nm under two-band excitation at 330 and 450 nm. The luminescence lifetime is 550 μs for 0.05 mol.% MnO2-doped glass-ceramics. The glass-ceramics obtained can be used as a source of deep-red radiation.


2021 ◽  
Vol 2103 (1) ◽  
pp. 012172
Author(s):  
A N Babkina ◽  
K S Zyryanova ◽  
Y B Egorova ◽  
A S Kulagina ◽  
R R Gavrilov ◽  
...  

Abstract Heat treatment conditions effect on the characteristics of exciton absorption and luminescence of CuCl and CuBr nanocrystals in potassium-aluminaborate glass is studied. The size effect of the band edge absorption and luminescence energy is confirmed. The simultaneous presence of copper halide nanocrystals and free monovalent copper ions in the glass matrix is shown. Possible conditions for the formation of mixed CuCl-CuBr crystals are considered.


Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1331
Author(s):  
Sarah Alnafaiy ◽  
Nawaf Labban ◽  
Ahmed Maawadh ◽  
Huda Alshehri ◽  
Refal Albaijan

This study evaluates the repair bond strength of resin-matrix and glass-matrix CAD/CAM ceramic materials based on two repair systems. Thirty specimens measuring 2.5 mm in thickness were prepared from Crystal Ultra (CU), Vita Enamic (EN), Lava Ultimate (LU), Cerasmart (CS), and Vitablocs Mark II (VM2) materials and aged for 5000 thermal cycles. Specimens were randomly allocated into three groups: control, Monobond-S (MS) primer, and Monobond Etch & Prime (MEP). Composite resin (Tetric N Ceram) (5 mm in diameter and 2 mm thick) was packed and light-cured onto treated specimen surfaces. Subsequently, the specimens’ shear bond strength (SBS) was evaluated, and failure modes was recorded. Statistical analysis was performed using factorial ANOVA and Tukey’s post hoc tests (a = 0.05). The factorial ANOVA revealed significant interactions between the material type and repair system, which was significant (p < 0.01). The highest and lowest SBS were obtained for CU (27.09 ± 1.11) and VM2 (4.30 ± 0.59) in MS and control groups, respectively. In all the groups, CU demonstrated higher SBS, whereas VM2 demonstrated lower SBS. There were no significant differences in SBS between EN and LU, and CS and CU in all the study groups (p > 0.05). The Monobond-S repair system provided non-significantly higher SBS compared to the MEP systems, except for VM2 and LU materials. The new resin-matrix CAD/CAM material demonstrated the highest SBS compared to the other materials for both conventional and MEP repair systems. Both repair systems showed clinically acceptable bond strength and allowed for successful repair of the resin-matrix ceramic materials.


Author(s):  
Da Xu ◽  
Wei Wang ◽  
Zhiwei Zhang ◽  
Zhiyong Mao ◽  
Dajian Wang

Phosphor-in-glass (PiG) composed of glass matrix and the embedded phosphor particles has been intensively developed to meet the requirement of high-power LED lighting sources. P2O5-based glass matrices are the promising candidates to fabricate high luminescence PiG in view of their low-melting temperature to avoid the erosion of phosphor by glass melting, however, their poor chemical durability limited the practical application. In this work, the water durability of PiG basing on SnCl2–P2O5–ZnO glass matrix embedded with YAG: Ce[Formula: see text] phosphor is demonstrated. With the addition of ZnO, the water durability of SnCl2–P2O5- based PiG is enhanced significantly without obvious loss of light output. The influence of ZnO addition with variable contents on the microstructure, photoluminescent properties and the water durability of the obtained PiG is investigated through a series of characterizations. The obvious improvement of the water erosion resistance induced by adding ZnO provides an optional route to develop higher stability, lead-free, cost-effective low-melting point P2O5-based glass matrix for fabrication of high performance PiG materials.


Author(s):  
O. Ryzhova ◽  
◽  
N. Ilchenko ◽  
T. Nagorna ◽  
S. Naumenko ◽  
...  

The paper presents the study on the identification of patterns of coloring of a basic glass matrix and enamel coatings based on it in the system R2O–ВаО–ZnO–Al2O3–В2О3–TiO2–SiO2 by a number of ionic dyes. Regardless of the dye content, ionic dyes give the same color tone to both glasses and coatings based on these glasses as follows: CuO (1.0–3.0 wt.%) =489–494 nm (blue-green), Fe2O3 (0.5–2.0 wt.%) =575–585 nm (yellow), K2Cr2O7 (0.5–2.0 wt.%) =570–576 nm (yellow-green), CoO (0.5–1.0 wt.%) =441–463 nm (blue-violet), and NiO (0.5–1.0 wt.%) glass=559'–571' nm, coatings=598–629 nm (brown). It is shown that according to the degree of color intensity of glasses and coatings based on them, the dyes are arranged in the following sequence: CoO>NiO>CuO>K2Cr2O7>Fe2O3.. The research was conducted using a special computer program COLOR GLASS. The established patterns are used in the development of lead-free glass enamels for jewelry and decorative products.


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