Banca de QUALIFICAÇÃO: MARIA JOSÉ GOMES DE ARAÚJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MARIA JOSÉ GOMES DE ARAÚJO
DATA : 20/04/2017
HORA: 14:00
LOCAL: Auditório do CCET
TÍTULO:

Carbon Foam: Synthesis, Characterization and Application

PALAVRAS-CHAVES:

Carbon foam, synthesis and textural properties.

PÁGINAS: 60
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

The advancement of science and the search for new materials, has been outstanding in recent years. However, numerous research related to the development of materials have specific purpose. This makes it necessary to exploit the properties and thus obtain multipurpose materials. Carbon foams are materials with pore structures, consisting mainly of macropores interconnected through windows. They have properties such as specific surface area, light weight, thermal and electrical conductivity, high thermal stability, surface hydrophobic character and so on. Due to these properties the carbon foams have been used in several areas of applications such as: electrodes, supports for catalysts, adsorption, thermal insulation at high temperatures among others. Thus carbon foams are promising materials for use in the adsorption of contaminants such as methylene blue as well as for the storage of gases. Carbon foams are produced by different methods. Among them the carbonization of a precursor with or without the use of a chemical agent. Various raw materials have also been used to synthesize the carbon foams among these stand out the sources oil and derivatives. However, it is necessary to search for sources of renewable raw materials as by-products of synthesis. In this sense, glycerol is a co-product of biodiesel being produced in excess. Thus, this work objective to synthesize carbon foams using sucrose (renewable) and glycerol (alternative source) as carbon source, and using aluminum, iron and silver nitrates as chemical agents. In addition, carbon foam was produced with the montmorillonite clay. Synthesis parameters were analyzed and it was observed that foams synthesized in tray with area of 94 cm2 presented greater regularity in growth and pore sizes. In the porosimetry by mercury intrusion / extrusion aluminum foams (EsAl) and iron (EsFe) presented porosity higher than 90%. In the nitrogen adsorption / desorption analyzes, the addition of iron (EsFe and EsAl5Fe5) caused the formation of mesopores characterizing hierarchical structure. X-ray diffraction data show that the foams have a turbotrastic structure.

MEMBROS DA BANCA:
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Interno - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Externo à Instituição - HUGO MOZER BARROS EUSTAQUIO - UNIFACEX
Externo à Instituição - MANUEL KARIM SAPAG - UNSL