Banca de QUALIFICAÇÃO: RIVALDO LEONN BEZERRA CABRAL

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RIVALDO LEONN BEZERRA CABRAL
DATE: 19/12/2019
TIME: 09:00
LOCAL: AUDITÓRIO DO CENTRO DE TECNOLOGIA
TITLE:

Nanocoating PLA Fibers with ZnO quantum dots (ZnOQDs) and ZnOQDs/RGO by Layer-by-Layer for potential multifunctional application.

KEY WORDS:

ZnO Quantum Dots, Graphene Reduced Oxide; Multifunctional Textile Material, LBL, Textile Fibers, PLA.

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Têxteis
SUMMARY:

With the proximity of the 4th industrial revolution, using nanotechnology tools as means to obtain new materials has shown that nanoscience is fundamental for the synthesis, characterization and application of materials with multifunctional properties. Soon, the textile industry has been one of the segments that has invested in research and innovation of nanotechnological products that will be available to society in its 2nd generation, which is more precisely, in the new industrial revolution. Among these nanotechnology tools, the surface modification of textile substrates with nanostructured materials allows the use of new materials in different areas of biotechnology, fashion and ecosystem, mapping more promising paths such as medical textiles, solar cells, supercapacitors. Starting from this assumption, in this project, a PLA knitting fabric was functionalized by layer by layer method with ZnO quantum dots (PQZnO) synthesized via Sol gel, in order to evaluate the self cleaning properties by photocatalytic activity, ultraviolet protection and antimicrobial activity. Furthermore, a study of the influence of graphene oxide (oxidade and reduced) on the properties obtained by PQZnO were evaluated. Thus, answers obtained by DRX analysis and SAED coupled to HRTEM revealed that the sun gel synthesis allowed a controllable process of colloidal solution of Quantum ZnO of Polycrystalline structure of the Type Wurtzite with particle sizes smaller than 8 nm, characterizing it as a quantum point (QD) of high brightness, behavior resulting from quantum confinement in the three dimensions of the semiconductor. In addition, SEM/FEG results demonstrate the micrograph of the surface of PLA fibers nanocoated with PQZnO. The photodegradation of the rodamina B cationic dye on the surface of the PLA knitting fabric by diffuse reflectance spectraphotometry demonstrates the self cleaning property obtained, degraded 89% in 12 hours under UV light, similarly photocatalytic property for the treatment of simulated effluent, photodegrading 53 %. In addition, this same PLA tissue presented antimicrobial activity, with a reduction in the growth rate of bacterial cells Staphylococcus aureus and Klebsiella Pneumoniae and an ultraviolet protection (UVA and UVB) with UPF 36 factor, considered very good.

BANKING MEMBERS:
Presidente - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Interna - 2614285 - KESIA KARINA DE OLIVEIRA SOUTO SILVA
Externo ao Programa - 1883170 - MAURICIO ROBERTO BOMIO DELMONTE
Externo à Instituição - FERNANDO DAL PONT MORISSO