Optical and spectroscopic study as a tool to probe the role of modifier oxides on bioactive behavior of zirconia added sodium boro silicate glass system

Abstract

A novel bioactive glass of the composition B2O3–SiO2–Na2O–ZrO2: MO is synthesized through conventional melt quenching technique. Role of some modifier oxides (Li2O, MgO, ZnO, and CaO) on bioactive behaviour through optical and spectroscopic properties of these samples is investigated after immersing in simulated body fluid (SBF) for about a month. XRD pattern and SEM pictures of the post-immersed sample in SBF solution suggested the deposition of HAp layer on surface of the samples. pH of the test solution is enhanced in the course of immersion and showed a linear increase at the initial stage and attained saturation after a period of about 10 days. The comparison of pH of the remnant solution of the glasses mixed with different modifier oxides indicated the maximal value for Li2O mixed glasses. The IR spectra of post immersed samples exhibited vibrational bands related to carbonated hydroxy-apatite groups. The optical band gap estimated from the optical absorption spectra indicated considerable increase due to immersion in SBF and it is attributed to the deposition of HAp layer on the glass surface. Overall analysis of the results indicated Li2O mixed glasses are more efficient bioactive glasses when compared with the glasses mixed with other modifier oxides.