Costa, Thércio Henrique de CarvalhoMedeiros Neto, João Freire de2020-03-112020-03-112020-01-30MEDEIROS NETO, João Freire de. Eficiência do plasma de descarga em barreira dielétrica nas alterações físico-químicas do polietileno de alta densidade e do titânio. 2020. 60f. Dissertação (Mestrado em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2020.https://repositorio.ufrn.br/jspui/handle/123456789/28509The superficial modification of materials is the object of studies in research centers, due to their impact in optimizing the applicability of the same. The use of plasma DBD is an alternative that blends the desired effects with the modification of surfaces and the low cost. In order to identify the effect of plasma on materials that have different character connections, the physical-chemical modifications of materials and their correlations with the species energies generated during the treatment of plasma in dielectric barrier discharge (DBD) in the modification of surface of high density polyethylene (HDPE) and Titanium. The efficiency of the plasma was determined through triple Langmuir probe in order to check if it had enough energy to promote chemical changes on the material surface. The physicochemical changes were diagnosed through surface characterization techniques such contact angle, surface tension, X-ray excited photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (ATR-FTIR), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The Langmuir probe results showed that the generated plasma has sufficient energy to promote the breakage of the bonds present in the PEAD, which corroborates the results obtained in the characterization of the samples through XPS, FTIR-ATR and surface tension. The XPS also showed the appearance of bonds such as TI-N and Ti-N-O, which influences the increase in the surface wettability of titanium.Acesso AbertoPlasma DBDPEADTitânioLangmuirMolhabilidademasterThesisCNPQ::ENGENHARIAS::ENGENHARIA MECANICA