Advanced optimization of dopant profiles in bismuth-enhanced bioactive glass through response surface methodology

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Nanotechnology

Background:

• Bioactive glasses are crucial for biological applications, with composition dictating their performance.
• Minor elemental variations can drastically alter the properties and biological response of these glasses.

Purpose of the Study:

• To investigate the influence of bismuth (Bi) doping (2, 4, 6 wt%) on silica-based bioactive glasses.
• To establish correlations between glass composition, structure, and physical properties using statistical modeling.
• To confirm the bioactivity and biocompatibility of the synthesized bismuth-doped bioactive glasses.

Main Methods:

• Utilized Analysis of Variance (ANOVA) with Central Composite Design (CCD) for compositional analysis.
• Characterized physical properties via Zeta potential, Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET) analysis.
• Assessed bioactivity and structure post-Simulated Body Fluid (SBF) immersion using Transmission Electron Microscopy (TEM), Energy-Dispersive X-ray (EDX), Fourier Transform Infrared (FTIR), and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

• Established a statistically significant correlation between glass composition and physical properties through ANOVA.
• SEM confirmed nanoparticle size, BET revealed porosity, and Zeta potential indicated stability.
• TEM/SAED observed hydroxyapatite (HA) formation, EDX verified composition, FTIR analyzed functional groups, and XPS determined Bi oxidation states.

Conclusions:

• The synthesized bismuth-doped bioactive glasses exhibit excellent bioactivity, biocompatibility, and non-cytotoxicity.
• The study successfully correlated compositional variations with material properties, validating the optimization model.
• These findings support the potential of tailored bioactive glasses for advanced biomedical applications.