Atomic force microscopy probing platelet activation behavior on titanium nitride nanocoatings for biomedical...

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Biocompatibility Research

Background:

• Medical implant biocompatibility is crucial for patient outcomes.
• Platelet activation and aggregation on biomaterial surfaces are key challenges.
• Titanium nitride (TiN(x)) films are potential candidates for implant coatings.

Purpose of the Study:

• To investigate platelet activation on stoichiometric and nonstoichiometric TiN(x) films.
• To develop a methodology for studying platelet behavior using Atomic Force Microscopy (AFM).
• To correlate TiN(x) film properties with thrombogenicity.

Main Methods:

• TiN(x) films were fabricated using sputtering.
• Film properties (morphology, structure, optical, wettability) were characterized by AFM, X-ray diffraction, and spectroscopic ellipsometry.
• Platelet adhesion, activation, and protein clustering were studied in real-time using AFM.

Main Results:

• A novel AFM methodology for real-time platelet studies was established.
• TiN(x) film stoichiometry and surface roughness significantly influenced platelet response.
• Stoichiometric and smoother TiN films demonstrated increased platelet adhesion and activation.

Conclusions:

• Surface properties of TiN(x) coatings critically affect thrombogenicity.
• Stoichiometric and smoother TiN films promote platelet adhesion and activation, requiring further consideration for implant applications.
• The developed AFM methodology offers a valuable tool for future biocompatibility assessments.