Synthesis of multifunctional macroporous-mesoporous TiO2-bioglasses for bone tissue engineering

Hierarchical porous TiO2-bioglasses (TiO2-BGs) with the macropore with the size of 30–50 μm and the mesopore with the diameter of 4.4–5.6 nm have been synthesized through the evaporation-induced self-assembly method. The corn stalks were used as the macroporous template and P123 as the mesoporous template in the process. The chemical and physical properties of the hierarchical porous TiO2-BGs before and after immersion in simulated fluid (SBF) were evaluated by X-ray diffraction, scanning electron microscope, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption, and Energy dispersive spectrometer. The effect of TiO2 content on the formation of surface hydroxyapatite and drug release profiles of the fabricated TiO2-BGs in SBF were investigated in detail. It was found that macroporous-mesoporous TiO2-bioglasses (MM TiO2-BGs) exhibited a good ability of surface hydroxyapatite formation comparing with macroporous-mesoporous bioglasses. It took only 3 h for the MM TiO2-BGs to be covered with the hydroxyapatite layer. It can be ascribed to the present of Ti–OH which may improve the spontaneous growth of apatite by consuming the calcium and phosphate ions from SBF. Additionally, MM TiO2-BGs also showed good drug sustained release profiles. Therefore, the multifunctional MM TiO2-BGs reported here could be a good candidate for application in bone tissue engineering.