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Structural studies of bio-active sol-gel phosphate-based glasses

Carta, Daniela, Pickup, DM, Knowles, JC, Smith, ME, Drake, KO and Newport, RJ (2005) Structural studies of bio-active sol-gel phosphate-based glasses Physics and Chemistry of Glasses, 46 (4). pp. 365-371.

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Phosphate based glasses have attracted great interest because of their application as bioresorbable materials. Because of their solubility in body fluid they can be used as degradable temporary implants for hard and soft tissue replacement and augmentation. In the present work, glasses with a composition of 45% P2O5, 35% CaO, 25% Na2O have been synthesised using the sol-gel method. Gels were obtained using OP(OR)x(OH)3−x (x=1, 2) as phosphorus precursor and alcoxides of calcium and sodium in ethylene glycol. Gels remained amorphous up to a calcination temperature of 400°C. At higher temperature, crystalline γ-Ca2P2O7 was identified. A comparison between the structure of the synthesised sol-gel glass and the structure of an analogue glass generated via the conventional melt quenching method has been performed. A broad based characterisation approach combining many techniques (x-ray diffraction, thermal analysis, infrared spectroscopy, 31P solid state NMR spectroscopy, P L-edge XANES) has been used. The structure of sol-gel, and its melt quenched analogue, is mainly formed by chains of (PO4)3− tetrahedral sharing two bridging oxygen (i.e. methaphosphate units).

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
Pickup, DM
Knowles, JC
Smith, ME
Drake, KO
Newport, RJ
Date : 1 August 2005
Depositing User : Jane Hindle
Date Deposited : 04 Sep 2017 10:07
Last Modified : 16 Jan 2019 18:56

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