Effect of Piezoelectricity of ZnO on CaP Deposition on Titanium Surface by Acoustic Excitation
Mechanical and Electrical College, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| Abstract: | The process of bone mineralization is affected by piezoelectricity. As biomedical materials, titanium and titanium alloys are widely used as implant materials due to their excellent mechanical and biological properties. They do not have piezoelectric properties. The preparation of a layer of zinc oxide film with good piezoelectric properties on the surface of titanium is conducive to enhancing the ability of bone mineralization. In this paper, the effect of the piezoelectricity of zinc oxide on the deposition of CaP on the surface of titanium alloy excited by sound waves in vitro was studied, providing a new idea for improving the surface bioactivity of titanium alloy. A dense nano ZnO film was prepared on TC4 sheet by hydrothermal synthesis using zinc chloride and sodium hydroxide as raw materials. The piezoelectric constant d33 of zinc oxide thin film was measured by quasi-static method. The piezoelectric property of zinc oxide thin film was stimulated by acoustic vibration generated by a flat motor vibrator. The biomimetic mineralization experiment was carried out to study the piezoelectric property of zinc oxide and the effect of different vibration time of the motor on CaP deposition. The results show that the ZnO thin films prepared by this method have good crystallinity, high purity and are mostly hexagonal sheets, with the length ranging from 200nm to 300nm, and the longitudinal piezoelectric constant d33 is 2.13-3.68pC•N-1. More CaP was deposited on the vibrating sample surface than on the non vibrating surface, and CaHPO4 and Ca3(PO4)2 were mostly used as the deposition products. The immersion sample that vibrated for 30s within 1h (12h in total) had the best deposition effect. |
| Keywords: | Zinc Oxide; Piezoelectricity; Titanium Implants; Hydroxyapatite |
| DOI: | 10.57237/j.se.2023.01.003 |
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Received: 12 December 2022
Accepted: 30 January 2023
Published Online: 3 February 2023
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