Teses em Engenharia de Recursos Naturais da Amazônia (Doutorado) - PRODERNA/ITEC
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/4045
O Doutorado Acadêmico inicou-se em 2006 e pertence ao Programa de Pós-Graduação em Engenharia de Recursos Naturais da Amazônia (PRODERNA) do Instituto de Tecnologia da UFPA (ITEC) da Universidade Federal do Pará (UFPA).
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Navegando Teses em Engenharia de Recursos Naturais da Amazônia (Doutorado) - PRODERNA/ITEC por Orientadores "REIS, Marcos Allan Leite dos"
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Item Acesso aberto (Open Access) Reforço superficial em alumínio fundido por nanotubos de carbono via tratamento de solubilização(Universidade Federal do Pará, 2021-10-14) BRITO, Paulo Roberto de Oliveira; REIS, Marcos Allan Leite dos; http://lattes.cnpq.br/8252507933374637Carbon nanotubes (CNTs) are noteworthy, as they reinforce the metallic matrix, due to mechanical properties, such as the ~ 1.0 TPa Young module. To improve the maintenance of the commercially pure aluminum surface, multi-walled carbon nanotubes (MWCNTs) were incorporated into the aluminum surface with heat treatment by solid solubilization, in order to improve the surface properties of aluminum. The aluminum samples were subjected to chemically attacked with the Keller reagent, for a period of 30, 60 and 120 seconds, and soon after the roughness assessment was carried out, and then they were placed in a container containing NTCs, being subjected to a 640°C for one hour. Afterwards, the morphology was evaluated in the scanning electron microscope, where an aggregate of NTCs was observed, the DRX was performed to evaluate the addition of the NTCs in the matrix, and the Raman Spectrum that evaluated the charge transfer to the matrix. Microhardness was performed to evaluate the result of the incorporation of the NTCs in the matrix. The results obtained show that the incorporation of CNTs in the aluminum matrix increases the hardness in approximately 20% of the surface, in comparison with the control sample. The process of incorporating CNTs into the aluminum matrix by solubilization is a promising, simple and inexpensive alternative to improve the durability of the aluminum surface.Item Acesso aberto (Open Access) Síntese e caracterização de cerâmicas bifásicas de fosfatos de cálcio (HA / β-TCP) a partir de nanocelulose do tegumento do açaí (Euterpe oleracea Mart.)(Universidade Federal do Pará, 2018-10-31) VALENTIM, Rachel Margalho Barreira; DIAS, Carmen Gilda Barroso Tavares; http://lattes.cnpq.br/2113791118142177; REIS, Marcos Allan Leite dos; http://lattes.cnpq.br/8252507933374637The remnants of the açaí agribusiness (Euterpe Oleracea Mart) are sources of lignocellulosic materials. The extraction of nanocellulose from the açaí integument constitutes viable raw material for the synthesis of biphasic ceramics (HA / β-TCP) by acid hydrolysis. After the fruit pulp is obtained a biomass that is divided into three fractions: sludge (parenchyma), fiber (monostelo) and endocarp. The integument is analyzed by MEV / EDS, through the endocarp of açaí of terra firme and of várzea presenting essential nutrients, to obtain ceramics of phosphates of calcium. The biocomposite (NC / HA / β-TCP) was characterized by MEV, presenting crystalline species on the surface of the nanocellulose; X-ray diffraction presenting HA nucleation attributed to type I cellulose and tricalcium phosphate (β-TCP) on the surface of cellulose type II; showing the growth of HA crystals on the surface of the nanocellulose. The FTIR analysis showed characteristic peaks of PO4-3, C1-H glycosidic deformation at 897 cm -1 attributed to cellulose, strong C-C conjugate binding at 1609 cm -1 attributed to lignin showing a decrease in content during the process. The results of particle size are in the nanometric dimension showing 643.50 nm as the most common value related to the results of the zeta potential presenting unstable particles producing particles aggregation and stable particles with modulus value greater than 20 mV. Due to the characteristics presented by the biphasic ceramic synthesized in this work it is suggested its application as biomaterial.