424 resultados para revestimentos comestível
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In this work, the influence of modifications of the cp-Ti and Ti 6Al 4V alloy, by treating the surface with NaOH and depositing titanium oxide and hydroxyapatite by sol-gel method, on their biocompatibility was studied. The coatings were characterized by scanning electron microscopy and X-ray diffraction which showed that the coatings on Ti 6Al 4V are better than on cp-Ti. Adhesion tests showed that adhesion strength of the coatings on cp-Ti substrate is less than on Ti 6Al 4V as well as cytotoxicity for L929 fibroblast cells is higher
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Pós-graduação em Engenharia Civil - FEIS
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Pós-graduação em Bases Gerais da Cirurgia - FMB
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Pós-graduação em Geociências e Meio Ambiente - IGCE
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Pós-graduação em Engenharia Mecânica - FEIS
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Pós-graduação em Engenharia Mecânica - FEIS
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Pós-graduação em Engenharia Mecânica - FEG
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Pós-graduação em Engenharia Mecânica - FEIS
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Pós-graduação em Engenharia Mecânica - FEG
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Using the sol-gel process, organic-inorganic hybrid coatings were synthesized by incorporation of different concentrations of functionalized carbon nanotubes, to improve their mechanical strength and thermal resistance without changing its passivation character. The siloxane-PMMA hybrids were prepared by radical polymerization of methyl methacrylate (MMA) with 3-methacryloxipropiltrimethoxisilane (MPTS) using the thermal initiator benzoyl peroxide (BPO), followed by acid catalyzed hydrolysis and condensation of tetraethoxysilane (TEOS). The analysis of pristine and functionalized carbon nanotubes was carried out using Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy and Raman Spectroscopy. Structural analysis of hybrids was performed by Nuclear Magnetic Resonance, Atomic Force Microscopy and Raman Spectroscopy. For analysis of mechanical strength and thermal stability were performed mechanical compression tests and thermogravimetric analysis, respectively. Electrochemical Impedance Spectroscopy was used to evaluate the corrosion resistance in saline environment. The results showed an effective functionalization of carbon nanotubes with carboxyl groups and conservation of its structure. The hybrids showed high siloxane network connectivity and roughness of approximately 0.3 nm. The incorporation of carbon nanotubes in the hybrid matrix did not change significantly their thermal stability. Samples containing carbon nanotubes exhibit good corrosion resistance (on the order of MΩ in saline environment), but the lack of complete dispersion of carbon nanotubes in the hybrid, resulted in a loss of mechanical and corrosion resistance compared to hybrid matrix.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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O presente modelo de utilidade descreve uma disposição construtiva em cadeira de banho para indivíduos com deficiência física motora e/ou com falta de estabilidade ou sustentação do tronco corporal que apresenta a estrutura do assento e do encosto de espuma de polietileno expandido de alta densidade, substituindo os convencionais revestimentos de material sintético, que não garante conforto ao usuário quando molhado e que se degenera rapidamente tendo em vista a umidade a que se encontra exposto, e alavancas dispostas nas laterais do assento interligadas à braços que se projetam descendentes com porção extrema inferior dotada de um batente que envolve a porção anterior das rodas frontais, evitando os tombamentos frontais nas situações de alteração do posicionamento do usuário em relação ao centro de gravidade da cadeira.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Graphic Design is a profession established with advent artistic vanguards of the twentieth century. As professional activity, it works with planning and projects which involve the visual solution of communication and information problems. Then, The Surface Design is the professional practice pledged with the elaboration of projects for coatings and application in products, giving attention to the production and materials in the processes. The relation between both Design areas is connected, at first, by the two-dimensional characteristic. In Brazil, academic study about Surface Design is in evolution and some universities works with this subject. Analyzing the concepts and characteristics concerning methodologies that comprehend both Graphic Design and Surface Design becomes a current and including subject. Therefore, it is necessary the conceptual unfolding and methodological in order to establish relations and contributions involved in the field of Graphic Design and apply them in Surface Design. Thus, the present study aimed to check concepts and particular functions of Graphic Design and to establish its relations and contributions for Surface Design. The results of this study can be used as teaching support and professional practice.