Characterization and Bioactivity in High Cristobalite-Nepheline-Apatite Glass and Glass Ceramics

Hamzawy, Esmat M. A.; Alharbi, Omar; Zaki, Dalia Y.

doi:10.1007/bf03401151

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…Through glass-ceramic, high cristobalite with nepheline and uorapatite were developed in the Na 2 O-CaO-Al 2 O 3 -SiO 2 -P 2 O 5 -F system and the sample containing the high crystalline nepheline ratio has the best bioactivity [9]. Uncontrollable the stable of high cristobalite can lead to decrease the strength, due to change from beta to alpha form which cause formation cracks, in the glass-ceramic samples within the SiO 2 -Li 2 O-P 2 O 5 -K 2 O-ZnO glass system [10].…”

Section: Introductionmentioning

confidence: 99%

Mono-crystalline nanometer high cristobalite glass-ceramic from nominal pyroxene glass

EL-Rafei

Azoz

Hamzawy

2021

Preprint

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Transparent glass was prepared from nominal alkali pyroxene (Na2 Mg Si2O6) composition. Incorporation of Cr2O3 in alkali pyroxene composition in two % (0.5 and 1.0) increases the crystallization temperature. High cristobalite was developed alone in all glass samples heat-treated at 800°C. The microstructure shows nanometer crystals of high cristobalite which spread in glassy matrix. The densities, hardness and coefficient of thermal expansion were between 2.49 and 2.53 g/cm3, 505 and 611 kg/mm2 and between 9.38 and 13.32 x 10− 6°C− 1 (30–300 ˚C ) respectively. The antimicrobial activity of the prepared glass and ceramics shows that the only samples contain 1% of Cr2O3shows an inhibition zone in case of Candida albicans yeast.

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Section: Introductionmentioning

confidence: 99%

Mono-crystalline nanometer high cristobalite glass-ceramic from nominal pyroxene glass

EL-Rafei

Azoz

Hamzawy

2021

Preprint

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“…In a recent study done by Hamzawy et al [7], in Na 2 O−CaO−Al 2 O 3 −SiO 2 −P 2 O 5 −F system, the stoichiometric binary nepheline-fluorapatite phases were prepared and investigated. Transparent glasses were obtained in a high stoichiometric ratio of nepheline, that is, 75, 80, 85, and 90%, whereas the low ones, that is, 25, 50, and 70%, gave devitrified glass samples.…”

Section: Introductionmentioning

confidence: 99%

In Vitro Bioactivity of Binary Nepheline-Fluorapatite Glass/Polymethyl-Methacrylate Composite

Zaki¹,

Hamzawy²

2018

Advances in Materials Science and Engineering

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In vitro bioactivity of stoichiometric nepheline-fluorapatite glass/polymethyl-methacrylate (PMMA (C5O2H8)n) composite was evaluated. Four glasses of nepheline/fluorapatite with different ratios (75/25, 80/20, 85/15, and 90/10 mole%) were added in 20 and 40 wt.% to PMMA. The composite samples were soaked in simulated body fluid (SBF) for 25 days. A scanning electron microscope with energy dispersive X-ray microanalysis (SEM/EDX) and thin film X-ray diffraction analysis was used to evaluate the composite materials after immersion in SBF. Inductively coupled plasma (ICP) and pH changes were used in the determination of the ions released and the alkalinity, respectively, after the immersion in Tris-buffered solution. Effect of glass filler loading on compressive strength of the cements was also evaluated. The four binary nepheline-fluorapatite glasses/PMMA cements composites are good potential bioactive materials. The compressive strength was between 70.36 ± 6.47 and 97.30 ± 3.90 MPa. In general, decreases of the compressive strength follow the increase of the glass ratio (i.e., 40 wt.%), but all meet that specified by the ASTM F-451.

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Mono-crystalline Nanometer High Cristobalite Glass-ceramics from Nominal Pyroxene Glass

EL-Rafei

Azooz

Hamzawy

2021

Silicon

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Characterization and Bioactivity in High Cristobalite-Nepheline-Apatite Glass and Glass Ceramics

Cited by 4 publications

References 15 publications

Mono-crystalline nanometer high cristobalite glass-ceramic from nominal pyroxene glass

Mono-crystalline nanometer high cristobalite glass-ceramic from nominal pyroxene glass

In Vitro Bioactivity of Binary Nepheline-Fluorapatite Glass/Polymethyl-Methacrylate Composite

Mono-crystalline Nanometer High Cristobalite Glass-ceramics from Nominal Pyroxene Glass

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