Microstructural characteristics and crystallization of CaO–P2O5–Na2O–ZnO glass ceramics prepared by sol–gel method

Cai, Shu; Zhang, W.J.; Xu, Guohua; Li, J.Y.; Wang, D.M.; Jiang, Wei

doi:10.1016/j.jnoncrysol.2008.11.008

Cited by 39 publications

(25 citation statements)

References 35 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface morphology of the glass sample shows the typical features of Ca-deficient apatite precipitation on the surface after immersion in SBF. High-magnification SEM images (Fig .7 upper) further reveal that each Ca-P granule consists of a large number of tiny flake-like crystals of Ca-P as reported earlier (33) . The bioglass specimens were further characterized in terms of their ability to form apatite in SBF.…”

Section: After Immersionsupporting

confidence: 79%

See 1 more Smart Citation

Preparation and Characterization of Zinc-substituted Bioactive Glasses with Sol–gel Method

2015

Egypt. J. Biophys. Biomed. Engng.

View full text Add to dashboard Cite

N PRESENT study, Different bioactive glass samples are prepared based on the following general formula: [65%SiO 2 -(25-X) %CaO-10% P 2 O 5 -X%ZnO)]; Ca 2+ is gradually substituted with Zn 2+(percentages of X= 0, 2, 4, 6, 8 and 10 mol %) by a quick alkalimediated sol-gel method. Development of a calcium phosphate (CP) layer on their surfaces is studied by soaking them in a simulated body fluid (SBF) for different periods. The consequent formation of the CP layer is studied by means of appropriate techniques such as X-ray diffractometry (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) with an energy dispersive system (EDXS). The concentration of Ca 2+, P 5+ ions released from the samples into the SBF is measured by using UV-Vis Spectrophotometer and biochemical Kits. The results show that the formation of calcium phosphate layer on glass surfaces is inhibited by ZnO substitution, and strongly dependent on Zn 2+ concentration.Since the discovery of the first bioglass by Hench et al.. several other glass compositions have been imposed to improve the rehabilitation process in surgical applications. One of the important trends in recent studies is incorporation of some ions in the bioglass composition to improve its biofunctionallity. Regarding the stimulatory effects of some cations such as Mg 2+ , Sr 2+ and Zn 2+ on bone formation either by oral administration or local delivering process (2) , the effect of incorporation of these ions on the physical and physicochemical properties of sol-gel derived glasses has been reported. Zinc (Zn) is the second most prevalent trace element in the human body and is reported to stimulate fracture healing of bone (3) , reduces postmenopausal bone loss (4) , improves bone mineralization (5) , and improves skeletal strength (6) . Furthermore, Zn is an effective agent in killing bacterial strains commonly associated with infection in orthopedic surgeries (7) .Despite the numerous works reporting the stimulating effects of zinc, there are also studies that show other effects of zinc ions on bone cells. Popp et al. studied the effect of Zn 2+ -supplemented osteogenic medium on osteoblastic I

show abstract

Section: After Immersionsupporting

confidence: 79%

“…The precipitation would change the super saturation of the surround solution and then cause the further dissolution of the samples. However, the Ca 2+ concentration has not shown a fast increment with the increasing of soaking time after deposition of apatite agglomerates (33) . …”

Section: Ph Analysismentioning

confidence: 93%

Preparation and Characterization of Zinc-substituted Bioactive Glasses with Sol–gel Method

2015

Egypt. J. Biophys. Biomed. Engng.

View full text Add to dashboard Cite

show abstract

“…The features appeared for S1 and S2 samples, can be explained as follows. The absorption bands around 3438 cm -1 is due to the symmetric stretching of O-H, and the signal at around 1648 cm −1 is due to the deformation modes of O-H groups and absorbed water molecules, δ(H-O-H) [28]. The two bands appeared at 2922 and 2372 cm −1 are related to ethylene glycol which adsorbed on the surface of samples during the smoothing process.…”

Section: Resultsmentioning

confidence: 98%

Growth and Characterization of Novel System of Nanoparticles Embedded in Phosphate Glass Matrix

Wageh¹,

Higazy²,

Algradee³

2011

WJCMP

View full text Add to dashboard Cite

show abstract

“…It also indicates the formation of agglomerates of crystalline phases amounting to a few tens of micrometres. The presence of the crystalline phase seems to explain the increase in chemical durability [13]. Comparing the SEM results for sample S 4 ( Figure 7) before and after being attacked by water at 90˚C for 20 days, it was found that the percentage of calcium in the glass composition increased while the percentages of sodium and oxygen decreased.…”

Section: Sem Micrographsmentioning

confidence: 92%

“…Annealed glasses in the series with composition xCaO-(30-x)ZnO-25Na 2 O-45P 2 O 5 were prepared at temperatures between 550˚C and 650˚C for 48 hours. Counting the RX spectra obtained shows (Figure 3) that the S 4 composition 30CaO•10ZnO•15Na 2 O•45P 2 O 5 tended to crystallize as a mixture of metaphosphate and pyrophosphate, with metaphosphate and/or rings metaphosphate chains majorities, while S 1 belonging to oligophosphate field samples is expected to contain a mixture of meta-and pyrophosphate networks related to those of calcium and zinc [13].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na2O-45P2O5

Chabbou¹,

Aqdim²

2014

AMPC

View full text Add to dashboard Cite

The influence of CaO on the glass forming characteristics and properties of Na2O-CaO-ZnO-P2O5 glasses has been investigated. According to the studies that we performed on phosphate based glass within system xCaO-(40-x)ZnO-15Na2O-45P2O5 (10 ≤ x ≤ 30; mol%), it was found that the increase of CaO and substitution of ZnO can give a good chemical durability. Both Cristallographies X-ray and IR spectroscopy have confirmed the structure change when the CaO content increases in the glass. This change results in the formation of metaphosphate and/or rings of metaphosphate groups at the expense of pyrophosphate. So it indicates the formation of Ca-O-P bonds in the network glass that replaces hydrated P-O-Na and P-O-P bands. The phosphate chains units can be bonded together in rings forming meta-phosphate groups. These rings likely lead to the formation of agglomerates of crystalline phases, which is the main cause of the increase in the chemical durability of the glasses when the CaO content increases. The latter may lead to wider use of these materials, especially in the biomedical field.

show abstract

Microstructural characteristics and crystallization of CaO–P2O5–Na2O–ZnO glass ceramics prepared by sol–gel method

Cited by 39 publications

References 35 publications

Preparation and Characterization of Zinc-substituted Bioactive Glasses with Sol–gel Method

Preparation and Characterization of Zinc-substituted Bioactive Glasses with Sol–gel Method

Growth and Characterization of Novel System of Nanoparticles Embedded in Phosphate Glass Matrix

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na<sub>2</sub>O-45P<sub>2</sub>O<sub>5</sub>

Contact Info

Product

Resources

About

Microstructural characteristics and crystallization of CaO–P2O5–Na2O–ZnO glass ceramics prepared by sol–gel method

Cited by 39 publications

References 35 publications

Preparation and Characterization of Zinc-substituted Bioactive Glasses with Sol–gel Method

Preparation and Characterization of Zinc-substituted Bioactive Glasses with Sol–gel Method

Growth and Characterization of Novel System of Nanoparticles Embedded in Phosphate Glass Matrix

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na&lt;sub&gt;2&lt;/sub&gt;O-45P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;

Contact Info

Product

Resources

About

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na<sub>2</sub>O-45P<sub>2</sub>O<sub>5</sub>