Feitor, Michelle CequeiraSantos, Rayane Saory Medeiros dos2024-02-082024-02-082023-10-30SANTOS, Rayane Saory Medeiros dos. Deposição de nanopartículas de óxido de zinco em tecido de algodão através do plasma por cilindros catódicos. Orientador: Dra. Michelle Cequeira Feitor. 2023. 58f. Dissertação (Mestrado em Engenharia Têxtil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2023.https://repositorio.ufrn.br/handle/123456789/57577The treatment of textile articles with zinc oxide has emerged as a noteworthy technique due to its capacity to confer diverse attributes upon the substrate, thereby enabling the realization of specific technical applications. These applications encompass shielding against ultraviolet (UV) radiation, antibacterial effects, flame retardancy, photocatalysis, hydrophobicity, and electrical conductivity. The direct deposition onto textile materials via plasma represents a promising avenue, notably due to its avoidance of water and the utilization of environmentally hazardous chemical reagents. The principal objective of this research is to effectuate the deposition of zinc oxide nanoparticles onto cotton fabric through plasma processes and subsequently analyze the bactericidal and photocatalytic activities. The cylindrical cathode deposition is a contemporary technique used in this study, whereupon insert zinc oxide compacted cyliderns in the cathodic cage onto plasma reactor. In light of the susceptibility of textile materials to elevated temperatures, cotton fabric samples are positioned externally to the cathode cage, within the reactor’s flange. The study explore of the influence of argon, hydrogen, and an gas mixture over varying treatment durations (1 and 2 hours). The treated samples was analyzed to Grazing Incidence X-ray Diffraction (GIXRD), Field Emission Scanning Electron Microscopy (FE-SEM) with Energy Dispersive Spectroscopy (EDS), Metilen Blue Photocatalysis and the bacterial activity analysis by Antibiogram and Violet Crystal. The presence of zinc is slightly found via GIXRD analysis. Through by EDS, was found ZnO and with notably higher proportions detected in samples treated exclusively with hydrogen. The visualization of nanoparticle presence via SEM is precluded due to limitations associated with the utilized magnification scale, because a higher scale damages the fabric cotton. All treated samples exhibits methylene blue degradation, with the most pronounced effect observed in the instance of samples treated solely with hydrogen gas over 2 hour. Crystal violet assays and antibiogram testing was carried on cultures of Methicillin-Resistant Staphylococcus aureus (MRSA) and Resistent Carbapenemase Pseudomonas aeruginosa (KPC+), representing gram-positive and gramnegative bacteria classifications of paramount concern, as identified by the World Health Organization (WHO). Crystal violet assays manifest inhibition of bacterial proliferation across all samples, save for Pseudomonas aeruginosa in the fabric treated exclusively with argon gas over a 2 hour interval. The most notable inhibition is in the case of Staphylococcus aureus, achieving an approximate 40% reduction in growth within fabrics treated solely with hydrogen gas. Antibiogram reveals the formation of a well-defined inhibition zone in the sample subjected to hydrogen gas treatment for 2 hours, while a modest inhibition zone is also observed in instances of hydrogen gas treatment for 1 hour and the gas mixture treatment over a 2 hour duration. The results of this study indicate the formation of a thin film on the cotton fabric surface with photocatalytic and antibacterial effects, particularly effective against grampositive bacterial strains.Acesso AbertoTêxtilAlgodãoDeposição por plasmaCilindros catóditosNanopartículas de óxido de zincomasterThesisCNPQ::ENGENHARIAS