Synthesis and structural characterization of P2O5–CaO–Na2O sol–gel materials

Carta, Daniela; Knowles, Jonathan C.; Smith, Mark E.; Newport, Robert J.

doi:10.1016/j.jnoncrysol.2006.12.093

Cited by 100 publications

(78 citation statements)

References 33 publications

(37 reference statements)

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“…Q 2 s), whereas the fixed 40 mol% P 2 O 5 glasses have much shorter chains (i.e. a mixture of Q 1 s and Q 2 s with reported ratios of *56 to *44, respectively) [50,51]. These shorter chains are able to pack together closely, thus creating more durable glasses with a tensile modulus greater than that for P50 fibres (*51.5 GPa).…”

Section: Discussionmentioning

confidence: 99%

Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails

et al. 2012

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This paper investigates the use of novel phosphate-glass fibre-reinforced rods as resorbable intramedullary nails. Random and unidirectional fibres were moulded into composite rods by forging at *100°C. Rods produced using non-woven random mats (RM) showed little improvement in mechanical strength over the unreinforced polylactic acid (PLA) rods. This was suggested to be due to the breakdown of the fibres during the manufacturing process; the length of the fibres decreased from 10-mm (initial) to *1.2 mm. Modulus and stiffness values for P50 RM rods were higher than those for the PLA rods which could be due to the orientation of the fibres during the rod manufacture process. Rods produced using long fibres parallel to the length of the rod displayed superior mechanical properties, not only against the PLA rods but also cortical bone. Maximum flexural, shear and compressive strengths were 242, 87 and 400 MPa, respectively. A flexural modulus of 25 GPa was achieved, with shear and compressive stiffness values of 6 and 21.5 kN mm -1 , respectively. These unidirectionally reinforced phosphate glass fibre PLA composites have huge potential to be used as IM fixation devices.

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Section: Discussionmentioning

confidence: 99%

Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails

et al. 2012

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“…For example, as sodium and calcium change their relative bonding to the phosphate tetrahedra. The shift ranges and the effects on 31 P are well defined [3,19,36,47,58,61]. The distribution of Q n species provides valuable information as to the range of environments.…”

Section: Magic Angle Spinning Nuclear Magnetic Resonancementioning

confidence: 99%

Titanium-containing bioactive phosphate glasses

Kiani

Lakhkar

Salih

et al. 2012

Phil. Trans. R. Soc. A.

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The use of biomaterials has revolutionized the biomedical field and has received substantial attention in the last two decades. Among the various types of biomaterials, phosphate glasses have generated great interest on account of their remarkable bioactivity and favourable physical properties for various biomedical applications relating to both hard and soft tissue regeneration. This review paper focuses mainly on the development of titanium-containing phosphate-based glasses and presents an overview of the structural and physical properties. The effect of titanium incorporation on the glassy network is to introduce favourable properties. The biocompatibility of these glasses is described along with recent developments in processing methodologies, and the potential of Ti-containing phosphate-based glasses as a bone substitute material is explored.

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“…G 4 -G 5 ). The Asymmetric stretching vibrations of t as P-O-P,of bridging oxygen atoms in phosphate chains [27][28][29][30][31][32][33][34] 781-735 Symmetric stretching vibrations of t s P-O-P, of bridging oxygen atoms in phosphate chains [27][28][29][30][31][32][33][34] and also due to pyrophosphate groups (P 2 O 7 ) 4- [36] 512 Fundamental frequency of PO 4 3-species of phosphate glasses or as harmonics of P-O bending vibration [37] 564 and 485 Two FeO 6 octahedral bands [40].…”

Section: Resultsmentioning

confidence: 99%

Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

Ibrahim

Darwish

Gomaa

2011

J Mater Sci: Mater Electron

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The present paper reports the influence of Ag 2 O addition at the expense of Li 2 O on the local structure of xAg 2 OÁ(30 -x)Li 2 OÁ10Fe 2 O 3 Á10SiO 2 Á50P 2 O 5 glass matrix (with x = 0, 0.5, 1, 1.5 and 2 mol %). The phosphate structural units of the network former are assessed from Fourier transform infrared (FT-IR) spectroscopy. The addition of Ag 2 O to the glass network matrix B1 mol % leads to the occurrence of a depolymerization process of the phosphate structure and consequently, to the appearance of a distortion of the PO 4 tetrahedra. When the content of Ag 2 O is increased from 1.5 up to 2 mol %, a remarkable polymerization process has been observed. The density, molar volume, microhardness and chemical durability have been investigated in order to study the effect of Ag 2 O/Li 2 O replacements on the physicochemical properties the studied glasses. The AC electrical properties are affected to a great extent with composition. These results are related to the internal structure of the glass samples. The conductivity, dielectric constant and dielectric loss of the studied glasses were studied using the frequency response in the interval 100 Hz-100 kHz and the effect of compositional changes on the measured properties was investigated. Measurements showed that the electrical responses of glass samples were different and complex for interpretation. The increase of Ag 2 O addition at the expense of Li 2 O contents (from 0 to 1 mol %) led to increase the conductivity, dielectric constant and dielectric losses of samples. The addition of more Ag 2 O at the expense of Li 2 O (from 1.5 to 2 mol %), resulting into decreasing the conductivity, the dielectric constant and dielectric losses of the studied glasses. The experimental data of the glass samples were argued to the internal structure of the glasses and the nature and role-played by weakening or increasing the rigidity of the structure of the sample. It could be concluded, therefore, that the AC electrical properties of the samples were influenced by the distribution of its constituents, connectivity, and number of free charges.

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Synthesis and structural characterization of P2O5–CaO–Na2O sol–gel materials

Cited by 100 publications

References 33 publications

Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails

Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails

Titanium-containing bioactive phosphate glasses

Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

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