Banca de DEFESA: JOSEFA LUANA DA SILVA SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOSEFA LUANA DA SILVA SOUSA
DATE: 24/11/2023
TIME: 14:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

MECHANOCHEMICAL SYNTHESIS OF NITROGENATED GRAPHENE: IMPACT ON CULTIVATING MODELS IN THE ADMINISTRATION OF MACROELEMENTS

KEY WORDS:

graphene; mechanical exfoliation; mechanochemistry; nitrogenation; Nanotechnology.

PAGES: 102
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Graphite is used in mechanized agriculture as a natural lubricant. Graphite powder is added to the seeds with the sole aim of reducing friction with the mechanics of mechanical seeders. In this study, a system was developed to perform the direct exfoliation of graphite powder Grafsolo® (Nacional de Grafite Ltda.) under high nitrogen pressure to obtain few-layer graphene (FLG) with the incorporation of nitrogen at the edges to add value with the functionalization of the lubricating material. Among N, P, and K, Nitrogen was chosen as a macroelement model, and an entire indoor cultivation system was designed and automated to choose a cultivar model as a plant ideotype for the tests. Based on the established parameters, santa cruz okra was chosen as a cultivar model, and the first trials were planned and carried out at this master's project. This approach established a proof of concept (PoC) for introducing high-pressure nitrogen while adhering to a solvent-free and environmentally friendly process. As a raw material, the choice of Grafsolo® was strategic, as this type of powdered graphite is widely used in various crops by the agroindustry and is commercially available, which favors the feasibility of scaling production. Focusing on agricultural applications, the research explored nitrogenous graphene as a coating for okra seeds of the santa cruz 47 type (ISLA Sementes Ltda.) during planting, aiming to provide more nitrogen as a primary macronutrient. For this, optimizations were carried out in the milling system to obtain nitrogenous graphene and the indoor cultivation system, guaranteeing an environment in conditions similar to the natural one for seed germination. The detailed characterization of the material was conducted using infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-Ray Diffraction (XRD), thermogravimetric analysis (TGA), and differential thermal analysis (DTA). Based on the results obtained, the efficiency of graphite exfoliation and the presence of nitrogen were verified through FTIR analysis. SEM images demonstrated the viability of producing nitrogenous graphene using the high-pressure mechanochemical method.

COMMITTEE MEMBERS:
Externo à Instituição - ETELINO JOSÉ MONTEIRO VERA CRUZ FEIJÓ DE MELO - IFPE
Presidente - 1206580 - PETRUS D AMORIM SANTA CRUZ OLIVEIRA
Externo à Instituição - RICARDO SCHNEIDER - UTFPR