Mechanical Property of TiO2 Micro/Nano Surface Based on the Investigation of Residual Stress, Tensile Force and Fluid Flow Shear Stress: For Potential Application of Cardiovascular Devices
The micro-patterned TiO2 nanotube has been anticipated for potential application for cardiovascular implanted devices for its excellent drug loading/ release function and biocompatibility. However, its mechanical behavior has rarely been studied as the cardiovascular devices. The tube length is a crucial factor which not only decides the drug loading ability but also influences the devices’ mechanical behavior. Therefore, in this work, the micro-patterned TiO2 nanotubes with different tube length (MNT2, MNT4 and MNT6) were fabricated, and their surface energy, residual stress, tensile tolerability and blood flow shear stress tolerability were determined, respectively. The results showed that the microstructure reduced the surface energy of the nanotubes surfaces, enhanced or reduced surface tensile tolerability when parallel or vertical to the strain orientation, and also increased the nanotubes surfaces residual stress; In addition, both micro/nano and single nano surfaces possessed good blood flow shear stress tolerability. These results indicated that the micro/nano surfaces possesses excellent mechanical properties for surface modification of cardiovascular devices.
C. Z. Han et al., "Mechanical Property of TiO2 Micro/Nano Surface Based on the Investigation of Residual Stress, Tensile Force and Fluid Flow Shear Stress: For Potential Application of Cardiovascular Devices", Journal of Nano Research, Vol. 49, pp. 190-201, 2017