Teaching / Thesis

Surface functionalization of magnesium alloys for biodegradable implants

PhD Candidate: Lara Moreno

This project consists in the design and fabrication of di and tri dimensional coatings on additive manufactured magnesium alloys (MgxZnXCa, x:1,3 and 0.5, and X:1, 0.3 and 0.2) by plasma electrolytic oxidation (PEO) following of breath figures (BF).

Available electrolytes of Ca/P-based were designed modification their composition, concentration, pH and conductivity, also, the parameters of PEO such as the power supply, voltage, current and time of process are modificated. On the other hand, two different polymers coatings were developed on PEO-Mg alloy system by dip coating process which are modificated concentration of polymers, speed limit, step number and time process. Coated samples and non-coated samples were characterized by XRD, SEM, TEM, SKPFM and perfilometry.

The corrosion behaviour is evaluated by electrochemical and hydrogen evolution measurements during 5 days of immersion in 0.9% NaCl and α-MEM solutions, a complete one and an inorganic part only, at 37ºC. Cell adhesion are evaluated by two types of C2C12 and M3C3 during 5 days at 37ºC.

The functionalization of polymeric coatings are tested by polymer funzionalization with drugs. The developed coatings are considered suitable candidates for the subsequent development of hybrid hierarchical ceramic/biodegradable polymer systems.