Síntese eletroquímica verde de TiO2NT com eletrólito a base de grânulos de Manihot esculenta

Abstract

In search of more sustainable solutions for the synthesis of coatings on titanium implants, this work addresses the replacement of ethylene glycol, widely used in titanium dioxide (TiO2) synthesis, with colloidal dispersions of starch extracted from Manihot esculenta. In addition to its toxicity, ethylene glycol presents safety challenges. The methodology addressed in this work aims not only to mitigate these problems, but also to adopt a more ecological practice. Starch solutions at different concentrations were investigated, used in the electrochemical synthesis of TiO2 coatings. The influence of synthesis temperature on coating properties along with heat treatment was also explored. The structural, morphological and electrochemical characterization of the materials was carried out by: X-ray Diffraction (XRD), Raman Spectroscopy (ER), Scanning Electron Microscopy with field emission (FE-SEM), Average Surface Roughness (Ra), Open Circuit (OCP) and Linear Potentiodynamic Polarization (PPL). The application of this new nanotextured titanium dioxide (TiO2NT) biomaterial was also evaluated, with the aim of using it as a dental implant. The pores were incorporated with Quercetin and its potential as an antimicrobial action was investigated using the disk diffusion test against the bacteria Streptococcus mutans. The results indicate that replacing ethylene glycol with starch solution allows the growth of a nanoporous TiO2 film that mimics the natural bone structure. For Ra, the samplesstudied suffer statistically significant influences from the three variables studied, as well as the cross effect of temperature and heat treatment. The statistical analysis carried out for the potentiodynamic polarization results showed that the concentration variable, as well as the cross effect of the three variables presented statistical significance for the material's corrosion rate. They also indicate that the formation of nanoporous TiO2 when subjected to heat treatment presents the crystalline anatase phase, which plays an important role in cell differentiation, reduction of bacterial load on the surface of implants and osseointegration. The study against the bacteria Streptococcus mutans proved to be indeterminate since there was microbial growth throughout the test, including in controls containing Tetracycline 30 mg.