Bioactive Uio-66 coating on polydopamine-modified titanium implants

Area of Science:

• Biomaterials Engineering
• Surface Science
• Nanotechnology

Background:

• Titanium (Ti) implants face biofunctional limitations like poor bioactivity and tissue integration.
• Bioactive coatings are crucial for enhancing cell-Ti implant interactions and overall implant success.

Purpose of the Study:

• To functionalize Ti substrates with UiO-66 metal-organic frameworks (MOFs) via a polydopamine-assisted coating strategy.
• To investigate how surface properties (hydrophilicity, roughness, wettability) influence biointerface behavior and coating performance.
• To enhance cell-Ti implant interactions and promote MC3T3-E1 cell viability.

Main Methods:

• Utilized a polydopamine-assisted coating strategy for functionalizing Ti substrates with UiO-66 MOFs.
• Characterized surface properties including hydrophilicity (water contact angle) and surface roughness (Ra).
• Evaluated MC3T3-E1 cell viability on the functionalized Ti surfaces.

Main Results:

• Achieved a well-controlled colloidal coating with moderate hydrophilicity (water contact angle ~70°) and reduced surface roughness (Ra ~23 nm).
• Demonstrated that MOF loading, surface roughness, hydrophilicity, and wettability are critical for biointerface behavior.
• The hybrid morphology promoted MC3T3-E1 cell viability while maintaining coating structural stability.

Conclusions:

• The polydopamine-assisted UiO-66 MOF coating strategy effectively enhances the biofunctionality of titanium implants.
• Optimized surface properties are key to improving cell-implant interactions and promoting tissue integration.
• This approach offers a promising method for developing advanced bioactive titanium implant surfaces.