ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
This study compares the in vitro behaviour in SBF of glasses from two different systems,TiO2-CaO-P2O5 and SiO2-CaO-P2O5 with the same TiO2 and SiO2 molar content, in order toevaluate the effect of TiO2 and SiO2 on the surface reactivity of those glasses.The glass formation regions in both systems were observed for compositions with less than 40mol% TiO2 and 40 mol% SiO2, respectively. Four glasses with similar TiO2 and SiO2 molarcontents have been selected for comparison. These glasses are equimolar in CaO and P2O5 withTiO2 or SiO2 varying from 4 to 33 mol %.Powder glasses were immersed in Simulated Body Fluid (SBF) and kept at 37ºC for different times,up to 14 days. Surfaces were observed by Scanning Electron Microscopy (SEM) and specimen ionleaching to SBF was studied by Inductively Coupled Plasma (ICP) spectroscopy. Preliminaryspectroscopic studies by Raman were performed to identify the structure of the glasses.For glasses of the SiO2-CaO-P2O5 system a significant dissolution of all ions was observed togetherwith the formation of phosphoric acid. In opposition, the immersion of TiO2-CaO-P2O5 glassesproduced a small Ca consumption and stable Ti and P concentrations, indicating the formation of aCa-P rich layer on these glasses.The observed differences in the dissolution behaviour are tentatively explained in terms of the glassstructures obtained by spectroscopy
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.138.pdf
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