Banca de QUALIFICAÇÃO: RAYANE SAORY MEDEIROS DOS SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RAYANE SAORY MEDEIROS DOS SANTOS
DATE: 18/09/2023
TIME: 14:00
LOCAL: PGTEC
TITLE:

ZINC OXIDE NANOPARTICULES DEPOSITION IN COTTON FABRIC VIA CATHODIC CYLINDRES PLASMA

KEY WORDS:

Textile, Cotton, Plasma Deposition, Cathode Cylinders and Zinc Oxide Nanoparticles.

PAGES: 50
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SUMMARY:

The 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 photocatalysis, antibacterial effects, shielding against ultraviolet (UV) radiation, flame retardancy, 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 X-ray Diffraction (XRD), 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 not found via XRD analysis, but is demonstrable through EDS, 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 gram-negative 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 gram-positive bacterial strains.

COMMITTEE MEMBERS:
Presidente - 2614274 - MICHELLE CEQUEIRA FEITOR
Interna - ***.250.394-** - MICHELLE DE MEDEIROS AIRES - UFRN
Interno - 2550377 - THERCIO HENRIQUE DE CARVALHO COSTA
Externo ao Programa - ***.133.814-** - IGOR OLIVEIRA NASCIMENTO - UFRN