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Itens para a visualização no momento 81-90 of 153
Fotossensibilizadores nanoestruturados por sistema camada por camada
(2014-06-05)
The search for materials that can be modified at molecular level has been the subject of several studies worldwide. Thus, the production techniques of thin films stand out due to the possibility of reducing costs and ...
Caracterização magnética de aço com a superfície endurecida
(2014-06-03)
This work investigates the magnetic properties (hysteresis loop and Barkhausen noise) in some steels (ABNT 1045, 1050 and 1548) whose surfaces had been hardened by induction. The goal was to develop a non-destructive test ...
Aplicação de areia de britagem de rochas basálticas na fabricação de concreto de cimento Portland
(2014-06-03)
Despite the technological advances on the structural concrete production, in natura materials are still used. This fact has been causing environmental and economic problems to the manufacturing chain. One of the problems ...
Tratamento termoquímico assistido a plasma para incremento da resistência à corrosão de aço-carbono
(2014-06-24)
This paper presents a study to facilitate the application of duplex treatment of
nitriding and post oxidation plasma as a way of enhancing the corrosion resistance of
carbon steel. The influence of microstructure, phase ...
Deposição de filmes finos de nitreto de zircônio para aplicação em biomateriais
(2014-06-04)
Zirconium nitride (ZrN) nanometric films were deposited onto different substrates, in order to study the surface microstructure and also to investigate the electrochemical behavior to obtain a better composition that ...
Caracterização de membranas de poliamida 66 preparadas pelo método de inversão de fases
(2014-06-04)
In the present study, polyamide 66 (PA 66) membranes were prepared by phase inversion (PI) and characterized in order to verify their potential application in separation processes. PA 66 membranes were prepared using two ...
Utilização de um adsorvente natural para remoção de pireno em meio aquoso
(2014-06-05)
In this study, two peat samples (one decomposed DP, and another fibrous FP) were characterized by several instrumental techniques, including scanning electron microscopy (SEM), elemental analysis (CHNS), thermogravimetric ...
Efeito do hidrogênio e mecanismos na pós-oxidação por plasma pulsado de ligas ferrosas nitretadas
(2014-06-03)
This work shows the hydrogen effect and the influence of processing temperature and time in the post-oxidation treatment by pulsed plasma on nitrided AISI 1045 ferrous alloy. The crystalline structure was analyzed by X-ray ...
Revestimentos protetores de nitreto de silício para aplicações tribológicas extremas
(2014-06-03)
The performance of engineering components is closely tied to surface phenomena, because it acts as an interface between the component and the environment that surrounds it. The choice of a suitable material with surface ...
Modificação da superfície de poliestireno por imersão em plasma para inibição da staphylococcus epidermidis.
(2014-06-05)
Polymeric materials, such as polystyrene, are widely used as biomaterials, both in the pharmaceutical industry and biomedical areas. With the use of more specialized biomaterials, it is reported a significant increase of ...