Structure and physicochemical properties of CaO–P2O5–Nb2O5–Na2O glasses

Maeda, Hirotaka; Lee, Sungho; Miyajima, Tomohiro; Obata, Akiko; Ueda, Kyosuke; Narushima, Takayuki; Kasuga, Toshihiro

doi:10.1016/j.jnoncrysol.2015.06.003

Cited by 34 publications

(23 citation statements)

References 21 publications

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“…Two overlapped peaks between 10 and −25 ppm were detected and assigned to Q p 0 and Q p 1 units (structural representation given in Fig. 3(B)) 14,15) . They are characteristic of phosphate invert glasses, which structurally consist of short phosphate chains and charge balanced with cations 31,32) .…”

Section: Resultsmentioning

confidence: 99%

“…The ions-release can be nely tuned by varying the content of niobia. For instance, the total amount of ions released from the Nb-PIGs after 7 days of immersion decreased from 7.5% to 2.5% with an increase of Nb 2 O 5 from 3 to 10 mol% 14) . In addition, Nb-PIGs showed promising biological response with stimulation of alkaline phosphatase activity (ALP) of osteoblast-like cells, a marker of differentiation 17) .…”

Section: +mentioning

confidence: 98%

“…, Nb 5+ and Na + ions continuously in a controlled manner 14) . The ions-release can be nely tuned by varying the content of niobia.…”

Section: +mentioning

confidence: 99%

“…Such behavior can be obtained with niobium-containing phosphate invert glasses (Nb-PIGs) 14,15) . Nb-PIGs are composed of short phosphate group, e.g., ortho-and pyrophosphates (Q p 0 and Q p 1 ), cross-linked together with tetrahedral niobia NbO 4 forming a glass network (P-O-Nb bonds) 14,15) .…”

Section: Introductionmentioning

confidence: 99%

“…Nb-PIGs are composed of short phosphate group, e.g., ortho-and pyrophosphates (Q p 0 and Q p 1 ), cross-linked together with tetrahedral niobia NbO 4 forming a glass network (P-O-Nb bonds) 14,15) . Compared to conventional phosphate invert glasses, the introduction of niobia signi cantly improved the chemical durability of the glasses [14][15][16] . Nb-PIGs can release ions such as Ca 2+ , P…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Antibacterial ZnO-CaO-P2O5-Nb2O5 Invert Glasses

et al. 2016

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ZnO-CaO-P 2 O 5 -Nb 2 O 5 invert glasses, with ZnO substituted for CaO, were successfully prepared using a melt-quenching method. Their structures, dissolution behaviors, and antibacterial abilities were evaluated. Niobate switched its role of network former to modi er with increasing ZnO content, as Zn 2+ ions preferentially coordinated with phosphate groups. In parallel, with increasing content of ZnO in the glasses, P-O-Zn bonds were formed, which crosslinked phosphate groups with ZnO acting as a network former. As a result, the glass-forming ability and chemical durability of the glasses were improved. The glasses showed antibacterial ability to gram-positive and -negative bacteria.

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Section: Resultsmentioning

confidence: 99%

Section: +mentioning

confidence: 98%

“…, Nb 5+ and Na + ions continuously in a controlled manner 14) . The ions-release can be nely tuned by varying the content of niobia.…”

Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Antibacterial ZnO-CaO-P2O5-Nb2O5 Invert Glasses

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Bioactive Glasses

Maeda

Kasuga

2017

Handbook of Solid State Chemistry

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Bioactive glasses have a specific ability to bond directly to living bones through the formation of hydroxycarbonate apatite at their interface. Ions released from the glass matrix upon dissolution can influence cellular responses. Using glass matrices has a significant advantage, as the structure and physicochemical properties of the glass matrix can be tuned by adjusting its chemical composition. This chapter introduces three types of bioactive glasses of different chemical compositions. The first section reviews silicate‐based glass systems. Therein, we demonstrate that the silicate network connectivity plays an important role in apatite‐formation and solubility of the glass system. The second section discusses borate‐based glasses. Borate glass matrices have a lower chemical durability than silicate‐based glasses and can be completely converted into apatite. Finally, the solubility and structure of phosphate‐based glasses are discussed in the third section. The section additionally presents invert glasses with unique structures.

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Structure, dissolution behavior, cytocompatibility, and antibacterial activity of silver‐containing calcium phosphate invert glasses

Lee

Nakano

Kasuga

2017

J Biomedical Materials Res

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Novel CaO-P 2 O 5 -Nb 2 O 5 -Ag 2 O invert glasses with substitution Ag 2 O for Nb 2 O 5 were successfully prepared using a melt-quenching method. Ag 2 O in the glasses act as a network modifier oxide, playing the same role as Na 2 O, which breaks the phosphate chains. Analysis of the ultraviolet-visible absorption spectra of the glasses showed that the glass matrix contained ionic silver species and silver nanoparticles. Approximately 0.05 mM of Nb 51 ions released from the glasses, which would be expected to stimulate osteoblast differentiation. A glass containing 1 mol % Ag 2 O showed a linear increase in the releasing amount of Ag 1 ions with increasing soaking time, whereas glasses containing 3-5 mol % Ag 2 O showed Ag 1 ion concentrations of around 13 lM at day 3, and then maintained similar values until day 7. When the solution was replaced with fresh solution every 2 days, the Ag 1 ion dissolution amounts indicated almost constantly 13 lM due to AgCl formation. There were no differences in the numbers of primary osteoblast cells on silver-free and silver-containing glasses after cultivation for 1-7 days. The silver-containing calcium phosphate invert glasses showed cytocompatibility with simultaneous antibacterial activity to Escherichia coli and Staphylococcus aureus. V C 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A:105A: 3127-3135, 2017.

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Structure and physicochemical properties of CaO–P2O5–Nb2O5–Na2O glasses

Cited by 34 publications

References 21 publications

Preparation of Antibacterial ZnO-CaO-P<sub>2</sub>O<sub>5</sub>-Nb<sub>2</sub>O<sub>5</sub> Invert Glasses

Preparation of Antibacterial ZnO-CaO-P<sub>2</sub>O<sub>5</sub>-Nb<sub>2</sub>O<sub>5</sub> Invert Glasses

Bioactive Glasses

Structure, dissolution behavior, cytocompatibility, and antibacterial activity of silver‐containing calcium phosphate invert glasses

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