Acta Metallurgica Sinica (English Letters) ›› 2024, Vol. 37 ›› Issue (9): 1581-1589.DOI: 10.1007/s40195-024-01724-x

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Preparation of TiO2 Nano-Flower Coating on Ti Substrates with Good Physical Sterilization Effect and Biocompatibility

Ruoyu Di1, Yonghua Sun1,2(), Runhua Yao1, Sen Pei1, Xiaohong Yao1, Ruiqiang Hang1   

  1. 1Shanxi Key Laboratory of Biomedical Metal Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
    2College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
  • Received:2024-01-27 Revised:2024-03-01 Accepted:2024-03-07 Online:2024-09-10 Published:2024-06-20
  • Contact: Yonghua Sun, sunyonghua@tyut.edu.cn

Abstract:

We report a facile solution method to form titanium oxide (TiO2) nano-flower structure on the titanium (Ti) substrates for realizing good physical sterilization and biocompatibility. We first prepare TiO2 nanotubes (NT) with a diameter of about 80-100 nm and a length of about 5 μm on Ti substrates by anodization, which is utilized as precursor. Then, we employ immersion treatment in different concentrations of phosphoric acid solution at 75 °C for 5 h to realize the transformation from TiO2 NT to TiO2 nano-flower structure. In addition, we studied the effects of phosphoric acid concentration (1 wt%, 2.5 wt%, 5 wt% and 10 wt%) on the TiO2 nano-flower structure, and the antibacterial properties and biocompatibility of the TiO2 nano-flower structure. The results show that TiO2 nano-flower structure become larger and thicker with the increase in the phosphoric acid concentration, and the thickness of the coating can reach 6.88 μm. Meanwhile, the TiO2 nano-flower structure shows good physical sterilization effect, especially for the TiO2 nano-flower structure formed in 10 wt% H3PO4 solution, the antibacterial rate can reach 95%. In addition, the TiO2 nano-flower structure have no toxicity to the osteoblasts and support cell growth.

Key words: Anodization, Biocompatibility, Physical sterilization, TiO2 nano-flower