Filmes finos à base de polianilina, nanotubos de titanato e ctab para revestimentos antifúngicos

Abstract

This work, describing the development of films LbL formed for polyaniline (PANI), titanate nanotubes (TiNTs - Na2Ti3O7) and cetyltrimethylammonium bromide (CTAB) are applications in antifungal coatings. First, in order to ascertain the originality of the work, a study of scientific and technological prospection was carried out (chapter 01) in the scientific bases Web of Science, Scopus and Scielo, and in the patent offices of the National Institute of Industrial Property - INPI, Office European Patent Office - US Patent and Trademark Office (USPTO), showing that thin film for application in antimicrobial coatings is an area that is under development and is something innovative with regard to antifungal coatings, since it was not found nothing in the literature with similar approach. After this step, the study of these LbL films developed (chapter 02) was performed, in which they were characterized by Cyclic Voltammetry (VC), Spectroscopy in UV-Vis (UV-Vis) and Atomic Force Microscopy (MFA). UV-Vis spectra have shown that the formation kinetics of LbL films is influenced both by the presence of TiNTs and the medium in which they were dispersed. Specifically, the film with the PANI (TiNTs) / CTAB architecture presented considerably higher absorbance values than the other architectures evaluated, whereas the MFA images, for this same film containing 20 deposited bilayers, showed a morphology with a uniform distribution pattern of TiNTs, probably due to the amphiphilic effect of CTAB. Next, the PANI (TiNTs) / CTAB film was evaluated in antifungal trials showing excellent activity against the opportunistic fungus Cryptococcus neoformans responsible for causing severe infections in immunosuppressed patients and even cryptococcal meningitis. The material developed in this work could be an innovative option and an excellent candidate for the coating of air conditioning pipes, as well as the antifungal activity, it also adds the anticorrosive and air purifying properties present in PANI and TiNTs, respectively.