TEDE Coleção:http://www.bdtd.uerj.br/handle/1/180522024-03-28T23:19:25Z2024-03-28T23:19:25ZTesteTeste, Testehttp://www.bdtd.uerj.br/handle/1/216392024-03-27T20:39:39Z2024-03-31T00:00:00ZTítulo: Teste
Autor: Teste, Teste
Primeiro orientador: Teste, Teste
Abstract: Teste
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Tese2024-03-31T00:00:00ZSíntese e caracterização de membranas compósitas de poli (éter-éter-cetona) sulfonado e óxido de grafeno sulfonadoCastro, Marcela Carrera dehttp://www.bdtd.uerj.br/handle/1/210702024-03-18T18:10:26Z2023-09-25T00:00:00ZTítulo: Síntese e caracterização de membranas compósitas de poli (éter-éter-cetona) sulfonado e óxido de grafeno sulfonado
Autor: Castro, Marcela Carrera de
Primeiro orientador: Moraes, Luanda Silva de
Abstract: Sulfonated graphene oxide (SGO) nanoparticles were synthesized to be applied as
reinforcements in sulfonated poly (ether-ether ketone) polymeric membranes (SPEEK).
SPEEK-SGO nanocomposite membranes (0.25%, 0.5% and 1%) were prepared, their
properties and potential application as proton exchange membranes in fuel cells (PEMFC)
were investigated. The RAMAN, FTIR, FRX, XPS, DRX analyzes of the nanoparticles
were carried out, which showed the effective sulfonation of graphene oxide (GO),
producing SGO with sulfur contents between 57% and 61%. The titration and FRX
techniques were applied to the membranes and demonstrated the success of sulfonation
of poly (ether-ether-ketone) (PEEK), generating SPEEK-SGO membranes with sulfur
contents between 67 and 76%. Through the TGA and DSC analyses, it was evidenced
that the SGO loads, in low concentrations, promoted greater thermal stability of SPEEK
in the range 100 – 200 °C. As the SGO charges increase the hydrophilicity of the polymer,
facilitating the proton transport channel, an increase in the proton conductivity in the
composite membrane is expected. Therefore, SPEEK-SGO composite membranes are
applicable as PEMFC.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Dissertação2023-09-25T00:00:00ZEstudo da resistência à corrosão das ligas não ferrosas: alumínio 6061 e cobre eletrolítico em contato com biodiesel de canolaTavares, Tamara da Silvahttp://www.bdtd.uerj.br/handle/1/210472024-03-18T18:03:18Z2023-07-14T00:00:00ZTítulo: Estudo da resistência à corrosão das ligas não ferrosas: alumínio 6061 e cobre eletrolítico em contato com biodiesel de canola
Autor: Tavares, Tamara da Silva
Primeiro orientador: Gaidzinski, Roberta
Abstract: The growing worldwide interest in the production and use of biodiesel as a substitute
for petroleum diesel seems to indicate a path towards a progressive substitution of petroleum as a fuel. The corrosivity of biodiesel is directly linked to it’s original raw material, that is, the characteristics of vegetable oils such as oxidation and moisture absorption, in addition to the attack of microorganisms during storage. Differences in chemical composition, mainly in relation to the degree of unsaturation, lead to degradation processes and the formation of products with different degrees of corrosivity. The presence of metallic ions in biodiesel, caused by corrosion, catalyzes oxidation reactions, leading to instability and accelerated degradation of biodiesel. This work aims to evaluate the corrosion resistance of electrolytic copper C110 and cluminum alloy 6061 immersed in canola biodiesel. Biodiesel was initially characterized according to the quality specifications of pure biodiesel (B100), obtained from canola oil, established by the ANP. The corrosion of the alloys was determined by means of mass loss measurements and calculation of the corrosion rate of the samples as a function of the immersion time in biodiesel (7, 30, 60 and 90 days), as well as the micrograph of the samples in an optical microscope metallographic. Biodiesel was characterized by acid number measurements and UV/Vis absorption spectroscopy in order to measure its degradation after different sample immersion times. With the aim of evaluating the influence of temperature on
the corrosion process, an immersion test of the samples in biodiesel (7 days) at room
temperature and at a temperature of 60°C was carried out. The results revealed that the
electrolytic copper alloy has a high corrosivity index in contact with biodiesel, compared to
aluminum alloy 6061. The copper alloy samples showed high corrosion rates, biodiesel with
increased acidity and degradation with over time, in addition to the micrographs showing
generalized and pitting corrosion of the samples. Tests carried out at a temperature of 60°C
showed an increase in corrosion for samples of both alloys in relation to samples immersed in biodiesel at room temperature.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Dissertação2023-07-14T00:00:00ZPneus inservíveis: reciclagem e uso nas pavimentações asfálticasFiore, Carlos Anderson Gomeshttp://www.bdtd.uerj.br/handle/1/206992024-02-27T17:20:44Z2022-12-07T00:00:00ZTítulo: Pneus inservíveis: reciclagem e uso nas pavimentações asfálticas
Autor: Fiore, Carlos Anderson Gomes
Primeiro orientador: Sirqueira, Alex da Silva
Abstract: The generation of waste by man is a problem that challenges society. Better waste disposal must be proposed by a collection policy, which in addition to correct disposal, is capable of contributing to the population's awareness from the point of view of both social and environmental sustainability, through actions that promote the reduction of waste. waste produced, reuse and recycling of materials. The contaminating potential of tires, especially due to their inadequate disposal, is a prominent factor in terms of pollution. On the other hand, the majority of pavements in Brazil are of low quality, both in terms of rolling comfort and durability. Annually, billions of reais are invested in the maintenance of Brazilian highways. There is a need to seek new techniques that minimize the problems encountered with the incorrect disposal of potentially polluting materials, combined with the development of better asphalt pavement that provides greater durability, trafficability, safety and lower maintenance costs. This work aims to carry out a bibliographical survey that can help to indicate paths towards a possible solution to this problem. The reuse of rubber powder extracted from disused tires for asphalt purposes has been practiced for many years in other countries, increasing the durability of the pavement and matte by 40%. In Brazil, it is not yet a practice, but it is becoming popular among highway concessionaires, which provides a sustainable destination for this material. Lack of control in tire disposal ends up degrading the environment, accumulating on the slopes of highways, rivers, vacant lots and various places, resulting in problems for society such as the proliferation of insects. As it is a thermo-fixed polymeric material, the decomposition process is quite slow, reusing it in paving is an intelligent solution for its use. Although this technique has a high initial implementation cost when compared to conventional asphalt, which is an obstacle to its implementation, asphalt modified with rubber has greater resistance, lower maintenance costs and contributes to the sustainability of the planet, which lengthens the term It is very important and essential to life. The use of post-consumed rubber from scrap tires is considered promising. The need for public policies that adopt measures to use the addition of tire dust (consumed powders) in the manufacture of asphalt is urgent and its benefits are countless.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Dissertação2022-12-07T00:00:00Z