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Mechanically Robust, Superlubricating and Antifouling Bilayer Nanocoating for Micro-Bioimplants via a Dual-Function
Li Xiang1,2, Yuhao Zhang1, Ziqian Zhao2
1School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, People's Republic of China.
ACS Nano
|December 27, 2024
Summary
Researchers developed ultrathin, robust coatings for medical devices using dual-function metal coordination. This strategy integrates mechanical strength, lubrication, and antifouling properties for advanced bioengineering applications.
Area of Science:
- Materials Science
- Biomedical Engineering
- Surface Chemistry
Background:
- Nanometer-thick ultrathin coatings are crucial for implantable medical devices, requiring mechanical strength, lubrication, and antifouling properties.
- Integrating these properties at the nanoscale is challenging due to trade-offs between strength, hydration, and coating thickness.
Purpose of the Study:
- To develop a novel strategy for creating ultrathin coatings with integrated mechanical, lubricating, and antifouling properties.
- To address the limitations in coating thickness and the inherent trade-offs between mechanical strength and hydration.
Main Methods:
- Utilized dual-function metal coordination with vanadium (VIII) ions to construct a ∼25 nm thick bilayer structure.
- Employed contact mechanics and interfacial molecular force measurements to characterize the coating structure and properties.
Main Results:
- The VIII-enabled bilayer structure demonstrated superior mechanical strength and lubricating performance (friction coefficient μ ≈ 10-3 under 10 MPa).
- The coating exhibited excellent resistance to biofouling in complex biological fluids.
- Confirmed the dual role of VIII ions in reinforcing the protein bottom layer and anchoring the hydrophilic polymer top layer.
Conclusions:
- A successful strategy for integrating seemingly incompatible properties into ultrathin coatings was presented.
- The developed multifunctional surfaces show potential for customizing micro-devices and machines in bioengineering applications.
