Speaker
Description
Introduction/Purpose
Titanium alloys are commonly used as metallic biomaterials due to their good biocompatibility, high electrochemical corrosion resistance, favourable fatigue strength and a high strength to weight ratio. However, they are bioinert. Therefore, in the present work a composite coating of zein and bioactive mesoporous sol-gel glass (MSGG) were electrophoretically deposited (EPD) on Ti-13Nb-13Zr alloy substrates.
Methods
Mesoporous SiO2-CaO-P2O5 based glass particles were synthesis by sol-gel. The coatings were fabricated by cathodic EPD. The tape test according to ASTM D3359-17 was used to assess the adhesion of coatings to the alloy substrates. Morphology and microstructure of the coatings was investigated using SEM and TEM, respectively. The surface topography of coatings was examined using optical profilometry. The contact angle (CA) and surface free energy (SFE) were measured using the static sessile drop method.
Results
The coatings, 10 µm thick, deposited from suspension containing 90 vol. % ethanol, 10 vol. % distilled water, 20 wt. % glycerol, 200 g/l zein and 40 g/l MSGG were dense and relatively homogeneous. They were consisted of MSGG particles with size up to 4 μm and their agglomerates embedded in the zein matrix. Pores were sporadically present in the coatings surface. The coatings showed very high adhesion to the substrates (class 5B). They exhibited a well-developed surface topography in comparison to the uncoated alloy, moderate hydrophilicity (CA=51.7±4.3 for polar water and CA=49.2±4.6 for nonpolar diiodomethane) and relatively high SFE of 54.1±5.5°.
Conclusions
It was shown that EPD allows to deposit a composite MSGG/zein coatings with good adhesion to the titanium alloy and well-developed surface with high SFE. Further characterisation of the coatings are in progress.
Acknowledgments
This work was supported by the National Science Centre, Poland (decision no DEC-2018/31/G/ST5/00429). The authors also acknowledge support from the German Science Foundation (DFG) (project BO 1191/25-1).
| Speaker Country | Poland |
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