Navegação Ciências Exatas e da Terra por Autor "Balzaretti, Naira Maria"
Resultados 1-13 de 13
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Agglomeration defects on irradiated carbon nanotubes
(2012) [Artigo de periódico]Aligned carbon nanotubes (CNT) were irradiated in the longitudinal and perpendicular directions, with low energy carbon and helium ions in order to observe the formation of defects in the atomic structure. Analysis through ... -
Biovidros e biovitrocerâmicas : uma revisão sobre suas propriedades
(2023) [Artigo de periódico]Estudos com biovidros e biovitrocerâmicas vêm ganhando destaque em função do desenvolvimento da medicina moderna. Muitos destes trabalhos têm como foco a melhora de propriedades em condições de uso destes biomateriais. ... -
Chitosan nanocomposites with graphene-based filler
(2019) [Artigo de periódico]This study evaluates the properties of chitosan (CS) membranes modified with different percentages (0.5%, 3%, and 5% w/w) of a graphene-based material. Graphene oxide (GO) and reduced graphene oxide (RGO) were obtained by ... -
Evaluation of the adhesion strength of diamond films brazed on K-10 type hard metal
(2004) [Artigo de periódico]The coating of cutting tools with diamond films considerably increases the tool performance due to the combination of the unique tribological properties of diamond with the bulk properties of the substrate (toughness). The ... -
Few layer reduced graphene oxide : evaluation of the best experimental conditions for easy production
(2017) [Artigo de periódico]This work aimed to produce graphene oxide with few graphene layers, a low number of defects, good conductivity and reasonable amount of oxygen, adequate for use as filler in polymeric composites. Two starting materials ... -
A modification of Ångström's method that employs photothermal radiometry to measure thermal diffusivity : application to chemical deposited diamond
(1998) [Artigo de periódico]A modification of the one dimensional A ° ngstro¨m’s method that employs photothermal radiometry has been used to determine the longitudinal thermal diffusivity of three thin long bars of chemical vapor deposited diamond. ... -
Nano-microstructured, superhydrophobic, and infrared transparent polytetrafluoroethylene/diamond films
(2013) [Artigo de periódico]A self-assembled polytetrafluoroethylene (PTFE) nanostructure is deposited on microcrystalline diamond (MCD) films, by use of physical and chemical vapor deposition in a two-step process, to produce (fully) superhydrophobic ... -
Polypyrrole/ionic liquid/Au nanoparticle counter-electrodes for dye-sensitized solar cells : improving charge-transfer resistance at the CE/electrolyte interface
(2019) [Artigo de periódico]To provide a viable alternative for counter electrodes used in dye sensitized solar cells, polypyrrole (PPy) based films have been synthesized via electrochemical deposition in the presence of the ionic liquid 1-butyl-3- ... -
Pressure dependence of the refractive index of monoclinic and yttria-stabilized cubic zirconia
(1995) [Artigo de periódico]The pressure dependence of the refractive index of monoclinic and yttria-stabilized cubic zirconia was measured up to 3 and 8 GPa, respectively, using an interferometric method with the diamond-anvil cell. The experimental ... -
Processing of amorphous carbon films by ultrafast temperature treatment in a confined geometry
(2001) [Artigo de periódico]A pressure cell with an anvil made of sapphire and the other made of tungsten carbide, was constructed to process thin film samples using a high power Nd:YAG pulsed laser, in a regime of ultrafast quenching rate and confined ... -
Resistance heating of the gasket in a gem-anvil high pressure cell
(1999) [Artigo de periódico]Resistance heating of the gasket strip in a gem-anvil high pressure cell was successful in obtaining sample temperatures up to 1100 °C, under pressures up to 4.0 GPa. The heating capabilities, as well as the mechanical and ... -
Tuning anatase-rutile phase transition temperature : TiO2/SiO2 nanoparticles applied in dye-sensitized solar cells
(2019) [Artigo de periódico]TiO2/SiO2 nanoparticles with 3, 5, and 10 molar percent of silica, were synthesized by hydrothermal method and characterized by SEM, TEM, N2 adsorption-desorption isotherms, X-ray diffraction, and Raman and UV-Vis spectroscopy. ... -
Variation of the refractive index and polarizability of sapphire under high pressures
(1993) [Artigo de periódico]In this article we present the experimental results for the pressure variation of the refractive index of sapphire up to 16 GPa, obtained with an interferometric method, using the diamond anvil cell. In the range of ...
