The study of the structure and bioactivity of the B2O3  Na2O  P2O5 system. (8th July 2013)

• Record Type: Journal Article
• Authors: Hidi, I. J.; Melinte, G.; Stefan, R.; Bindea, M.; Baia, L.
• Is Part Of: Journal of Raman spectroscopy. Volume 44:Number 8(2013:Aug.)
• Page Start: 1187
• Page End: 1194
• Publication Date: 2013-07-08
• Subjects: Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.4330
• Languages: English
• ISSNs: 0377-0486

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>In this study, we have investigated calcium and silicate‐free samples over a wide compositional range in the xB<sub>2</sub>O<sub>3</sub>·30 Na<sub>2</sub>O·(70−x)P<sub>2</sub>O<sub>5</sub> system, with 0 ≤ <italic>x</italic> ≤ 70 mol%, in order to determine the influence of the chemical composition on their structure and bioactive response in simulated body fluid. Information related to the chemical structures present in the network was obtained by means of Raman and infrared spectroscopy. For samples containing small amounts of P<sub>2</sub>O<sub>5</sub>, boron structures are preponderant. Upon increasing the phosphorus content, the samples' network is based on phosphate chains linked by boron groups through 'P–O–B' bridges. For high concentration of P<sub>2</sub>O<sub>5</sub>, the Q<sup>3</sup> units form three‐dimensional network, whereas Q<sup>2</sup> units assist the chain formation. Regarding the <italic>in vitro</italic> assessment of bioactivity, the clear print of PO<sub>4</sub> asymmetric bending vibrations of apatite‐like layer in the 540–680 cm<sup>−1</sup> spectral domain, the scanning electron micrographs and energy dispersive x‐ray analysis spectra demonstrate that the studied borophosphate samples exhibit good bioactive response only for certain chemical compositions. More exactly, the highest bioactivity is obtained for 30% and 20% B<sub>2</sub>O<sub>3</sub> (mol%) after 3 and 11 days of immersion, respectively. Therefore, the samples with 20–30 mol% boron content are valuable candidates that can be used as materials for tissue engineering applications. Copyright © 2013 John Wiley & Sons, Ltd.</p> </abstract>