Toward Highly Dispersed Mesoporous Bioactive Glass Nanoparticles With High Cu Concentration Using Cu/Ascorbic Acid...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Materials Chemistry

Background:

• Copper (Cu) ions possess beneficial biological activities like promoting new blood vessel growth (proangiogenic) and fighting bacteria (bactericidal).
• Silicate-based mesoporous bioactive glass nanoparticles (MBGNs) are biocompatible and biodegradable, making them suitable for delivering Cu ions.
• Challenges in Cu incorporation into MBGNs include particle clumping, formation of insoluble copper compounds, and low copper loading.

Purpose of the Study:

• To develop a novel method for synthesizing chemically uniform and highly dispersed Cu-MBGNs with controllable Cu concentrations.
• To overcome limitations of previous methods, such as particle aggregation and formation of crystalline copper nanoparticles.
• To evaluate the properties and potential biomedical applications of the synthesized Cu-MBGNs.

Main Methods:

• Utilized a microemulsion-assisted sol-gel approach.
• Employed ascorbic acid/Cu complexes as the copper precursor.
• Characterized particle morphology, size, pore structure, copper concentration, crystallinity, and oxidation state using techniques like ICP-AES, XRD, and XPS.

Main Results:

• Synthesized spherical Cu-MBGNs (100-300 nm) with tunable pore sizes (2-10 nm) and copper concentrations (0-~6 mol%).
• Achieved chemically homogenous and highly dispersed particles without aggregation or crystalline copper formation.
• Confirmed the amorphous nature of Cu-MBGNs and the predominant Cu²⁺ oxidation state, while maintaining bioactivity and controlled ion release.

Conclusions:

• A feasible strategy was established for synthesizing highly dispersed amorphous Cu-MBGNs with high, tunable copper concentrations.
• The synthesized Cu-MBGNs are promising for biomedical applications, including scaffolds, coatings, and drug carriers.
• These nanoparticles offer a way to deliver significant amounts of copper ions without compromising the properties of composite materials.