Titanium micro/nanometer double-structured dioxide thin film with high biological activity and preparation method thereof

Abstract

The invention relates to a titanium micro / nanometer double-structured dioxide thin film with high biological activity and a preparation method thereof, and belongs to the field of biomedical materials and surface engineering. The preparation method of the thin film comprises steps of: micro-arc oxidizing a cleaned titanium metal surface, and utilizing a lithium tetraborate aqueous solution as an electrolyte and a bipolar pulse micro-arc oxidation power supply as a power supply, wherein the working voltage is 360-500V, the current density is 1-4A / dm<2>, the impulse frequency is 400-700Hz, the duty ratio is 10%-30%, and the oxidation time is 1-30 minutes. The obtained thin film has a structure that homodisperse micron-order grooves and nanometer-order holes are distributed on the surface of the whole thin film in an overlapping manner. The micro / nanometer double-structured dioxide thin film has a special performance, i.e. the film has superstrong wetting ability, and the contact angles of the water and oil are zero. The film has an important meaning on a new generation of a dental implant which can bear large occlusal force and has a short healing phase. The preparation method is simple, the electrolyte is pollution-free, and the film is easy for large-scale production and industrial popularization.

Description

technical field [0001] The invention relates to a highly biologically active titanium dioxide film with a micro / nano dual structure and a preparation method thereof. The titanium dioxide thin film can be used as a surface modification layer of a human body hard tissue substitute material, and belongs to the fields of biomedical materials and surface engineering. technical background [0002] Compared with other metal medical implant materials, titanium metal has become a popular choice for dental implants, bone trauma products and artificial joints because of its low elastic modulus, low density, high specific strength, excellent corrosion resistance, and good processing and forming properties. It is the preferred material for human hard tissue substitutes and restorations, and it has been more and more widely used clinically. After hard tissue replacement materials are implanted into the human body, they must be well fixed with the surrounding bone tissue. Typically, in t...

AI Technical Summary

Problems solved by technology

Due to the limitation of the selected electrolyte, the TiO prepared by this technical scheme 2 There are still deficiencies in the performance of the modified film in terms of biological activity. The main problems are as follows: ① When sodium tetraborate is used as the electrolyte, although the prepared TiO 2 The membrane layer structure is composed of micron-scale wrinkled pores and nanoscale micropores evenly distributed around the pores, but the interconnection of the micron-scale pores is not enough, and the number of nanoscale pores is small and the depth is shallow, making the film layer The structure is mainly micron-scale pore structure, the micro / nano dual structure features are not significant, and the superhydrophilic performance of the film layer cannot be fully exerted; adsorption and growth

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