ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 59, (1) 64 - 69 (2015)

Latifi Seyed Mohsen 1,2, Fathi Mohammadhossein 1,3, Varshosaz Jaleh 2, Ghochaghi Niloufar 4
1 Biomaterials Research Group, Department of Materials Engineering,Isfahan University of Technology, Isfahan 84156-83111, Iran
2 Department of Pharmaceutics, Faculty of Pharmacy and Novel Drug Delivery Systems Research Centre, Isfahan University of Medical Sciences,PO Box 81745-359, Isfahan, Iran
3 Dental Materials Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
4 Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, Virginia, 23284, USA

Keywords: Ca ion, Silica, Apatite, Nanocomposite powder, Sol-gel

Ca ion release from bioactive biomaterials could play an important role in their bioactivity and osteoconductivity properties. In order to improve hydroxyapatite (HA) dissolution rate, in situ apatite-silica nanocomposite powders with various silica contents were synthesized via sol-gel method and mechanisms controlling the Ca ion release from them were investigated. Obtained powders were characterized by X-ray diffraction (XRD) and transmission electron spectroscopy (TEM) techniques, acid dissolution test, and spectroscopy by atomic absorption spectrometer (AAS). Results indicated the possible incorporation of SiO₄⁴⁻ into the HA structure and tendency of amorphous silica to cover the surface of HA particles. However, 20 wt. % silica was the lowest amount that fully covered HA particles. All of the nanocomposite powders showed more Ca ion release compared with pure HA, and HA - 10 wt. % silica had the highest Ca ion release. The crystallinity, the crystallite size, and the content of HA, along with the integrity, thickness, and ion diffusion possibility through the amorphous silica layer on the surface of HA, were factors that varied due to changes in the silica content and were affected the Ca ion release from nanocomposite powders.

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