Bioactive Glass Characterization and Applications
Summary
Bioactive glasses are phosphate- and silicate-based amorphous materials specifically engineered to interact with biological tissues, most notably bone. Upon immersion in physiological fluids, these glasses undergo controlled ion exchange and network dissolution, leading to the formation of a hydroxycarbonate apatite layer that mimics natural bone mineral. Characterization of these dynamic surface reactions relies on a suite of techniques, including spectroscopy, diffraction, electron microscopy and mechanical testing, alongside computational modelling. Such approaches reveal the influence of composition, network connectivity and nanostructure on dissolution rates, apatite crystallinity and mechanical integrity.
Applications of bioactive glass span bone graft substitutes, tissue-engineering scaffolds and bioactive coatings for metallic implants. Beyond orthopaedics, tailored compositions enable controlled release of therapeutic ions for angiogenesis, antimicrobial action and drug delivery. Advances in sol–gel and mesoporous processing have further expanded surface area, porosity and functionalisation options, driving a new generation of multifunctional biomaterials with global significance for regenerative medicine.
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Recent studies have employed computer simulation to elucidate ionic clustering phenomena within bioactive glass networks. Simulations reveal that fluoride and phosphate ions form distinct modifier-rich clusters, shedding light on local compositional heterogeneity and its impact on dissolution kinetics and ion release profiles. In parallel, novel nanoindentation protocols have been developed to quantify mechanical changes at the earliest stages of apatite layer formation. By correlating hardness and elastic modulus evolution with immersion time in simulated body fluid, these methods offer a rapid, quantitative measure of in vitro bioactivity linked to network depolymerisation and surface layer maturation. Composite scaffolds combining submicron corundum and silicate-phosphate bioglass have also been characterised, demonstrating efficient hydroxyapatite deposition on surface pores and supporting chondrocyte attachment and proliferation. Such interdisciplinary work highlights how structural, mechanical and biological assessments converge to guide the design of next-generation bioactive materials.
Bioactive Glass Characterization and Applications publication trend
The graph below shows the total number of articles in bioactive glass characterization and applications across all publications each year (not limited to Nature Index journals).
Technical terms
Bioactive glass: A glass composition that elicits a favourable biological response, typically by bonding to bone or tissue through surface reactions.
Simulated body fluid: A solution with ion concentrations similar to human plasma, used to assess in vitro bioactivity of materials.
Hydroxycarbonate apatite (HCA): A calcium phosphate phase formed on bioactive glass surfaces that mimics the mineral component of bone.
Amorphous calcium phosphate (ACP): A non-crystalline precursor to hydroxycarbonate apatite formed during early stages of glass dissolution.
Nanoindentation: A mechanical testing technique that measures hardness and elastic modulus at the nanoscale by indenting a material’s surface.
References
- Clustering of fluoride and phosphate ions in bioactive glass from computer simulation. Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (2023).
- Tracking the initial stage of bioactive layer formation on Si-Ca-Na-P oxide glasses by nanoindentation. Journal of Non-Crystalline Solids (2022).
- Selected physico-chemical properties of composite scaffolds of sintered submicrocrystalline corundum and bioglass. The International Journal of Advanced Manufacturing Technology (2022).
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