Study of Bioactive and Structural Properties of Na2O Modified Glassess

Abstract

Biomaterials are being used in medical devices or in contact with biological systems. They may be distinguished from other materials in that they possess a combination of properties, including chemical, mechanical, physical and biological properties that render them suitable for safe, effective and reliable use within a physiological environmentIn this study glasses with composition (55-X) SiO2 -10 Al2O3 -15 CaO -5 TiO2 – (10+X) Na2O (X = 5, 10, 15 mol %) were prepared by melt-quenching technique. Bioactivity of the glasses was investigated in vitro by examining apatite formation on the surface of glasses after dipping in a simulated body fluid (SBF), SBF solution exhibit ions concentrations nearly equal to those in human blood plasma. Formation of bioactive apatite layer on the samples treated in SBF was confirmed by using Fourier transform infrared reflection (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometer. Development of an apatite structure on the surface of the SBF treated glass samples as functions of composition and time could be established using the XRD data.FTIR spectra of the glasses treated in SBF show some fundamental changes which is related to formation of apatite after 14-day of immersion in SBF. SEM observations revealed that the spherical particles formed on the glass surface were made of calcium and phosphorus. Increase in bioactivity with increasing sodium oxide content was observed. The results have been used to understand the evolution of the apatite surface layer as a function of glass composition and immersion time in SBF. The XRD pattern and band gap measurement clearly indicate some modification on the surface of the glasses which is manifestation of the apatite formation