Banca de DEFESA: FELIPE MENDONÇA FONTES GALVÃO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FELIPE MENDONÇA FONTES GALVÃO
DATE: 17/09/2021
TIME: 14:00
LOCAL: GOOGLE MEET - MODO REMOTO
TITLE:

OPTIMIZATION AND APPLICATION OF A SUPERHYDROPHOBIC AND CAPACITIVE NANOCOATING OF GRAPHENE/FLUOROPOLYMER VIA SPRAY MIST ON POLYESTER FABRIC

KEY WORDS:

Graphene Oxide; Reduced Graphene Oxide, Spray Mist Coating, Nanotechnology, Superhydrophobic, Supercapacitive.

PAGES: 125
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Têxteis
SUMMARY:

Our knowledge of the fundamental structure and bonds of graphene oxide, as well as the scope of its applications, such as in the fields of physics, chemistry and materials science, have had significant scientific growth in the last decade. After 17 years of its discovery, advanced studies of its application in renewable energies, energy storage, heterogeneous photocatalysis, sensors, biomedical engineering, biotechnology, antennas, composites and others, have made this material one of the objects of study and obtaining numerous patents currently. Advances in these areas were driven by improvements in the methods used to synthesize and characterize graphene oxide (GO) as well as its reduced phase, RGO. Thus, this work performed the synthesis of GO by the Humme's method and then the reduction of this graphene oxide (RGO) with different reducing agents: ascorbic acid, sodium hydrosulfite, Goldred JMA and Goldred Eko. The reduced samples were characterized by DRX, RAMAN, FTIR, BET, HRTEM and MEV-FEG. The best, most sustainable reducer was selected and used in all subsequent experimental phases. Thus, this work had as main objective to use an environmentally friendly reducing agent derived from sugars to obtain a superhydrophobic and supercapacitive textile material. A Box-Behken experimental design was applied where the variables evaluated in the application process by the spray coating mist method of the nanomaterials on the polyester fabric were: 2RGO/Fluopolymer ratio (mass/mass) of 1/5, 3/15 and 5 /25; fixation temperature in an infrared vine of 100 ºC, 125 ºC and 150 ºC and fixation time of 2, 6 and 10 minutes, having as response variable the contact angle value, obtained using a goniometer. The PET fabric samples with superhydrophobic behavior and the control were characterized by microstructural and colorimetric modification. It was proven that the PET fabric functionalization method was promising, obtaining a superhydrophobic behavior with a contact angle greater than 150ºC and durable to washing and friction testing. It is concluded that the optimized functionalization method was responsible for obtaining a superhydrophobic textile material capable of industrial application.

BANKING MEMBERS:
Presidente - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Interna - 2614285 - KESIA KARINA DE OLIVEIRA SOUTO SILVA
Externa ao Programa - 2275848 - ELISAMA VIEIRA DOS SANTOS
Externo à Instituição - PIERRE BASILIO ALMEIDA FECHINE - UFC