Coleman, Nichola J., Bellantone, Maria, Nicholson, John W. and Mendham, Andrew P. (2007) Textural and structural properties of bioactive glasses in the system CaO-SiO2. Ceramics-Silikáty, 51 (1). pp. 1-8. ISSN 0862-5468

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Abstract

Gel-derived CaO-SiO2 binary glasses of CaO mole fractions 0. 2, 0.3 and 0. 4 have been prepared and characterised. Pore diameter specific pore volume, skeletal density and porosity were found to increase with increasing CaO-content, whereas a concomitant decrease in specific surface area was observed. Si-29 NMR indicated that the 0.2 CaO mole fraction glass consisted of higly polymerized Q(4) and Q(3) silicate species, with some Q(2) units. With increasing CaO mole fraction, these silicate species became progressively depolymerised such that isolated SiO4 tetrahedra were detected within the 0.4 CaO glass matrix. Unusually, the glasses retained a proportion of Q(4) and Q(3) species as the CaO mole fraction was increased. All glass formulations exhibited in vitro bioactivity. The rate of hydroxyapatite precipitation followed the order 0.2 CaO > 0.4 CaO > > 0.3 CaO, an effect that is attributed to differences in the rate of dissolution of calcium from these glasses. This, in turn, appears to be dependent upon the proportion of Ca 21 participating in the formation of the glassy network.

Item Type:	Article
Additional Information:	[1] Ceramics-Silikaty is open access journal.
Uncontrolled Keywords:	sol-gel, bioactive, mesoporous, glass
Subjects:	Q Science > QD Chemistry
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > School of Science (SCI)
Related URLs:	Publisher Organisation Organisation
Last Modified:	13 Feb 2020 11:51
URI:	http://gala.gre.ac.uk/id/eprint/2478

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