Thick Films
Mostrando 1-12 de 70 artigos, teses e dissertações.
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1. Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD
The present study evaluated the main factors that influence the photocatalytic activity of titanium dioxide (TiO2) films grown by metalorganic chemical vapor deposition (MOCVD) at 400 and 500 °C, in different growth times. The photocatalytic behavior was analyzed by measuring the methyl orange dye degradation at different pH values. Structural and morpholog
J. Braz. Chem. Soc.. Publicado em: 2020-06
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2. Co3O4-ZnO P-N Heterostructure Nanomaterials Film and its Enhanced Photoelectric Response to Visible Lights at Near Room Temperature
In this paper, Co3O4-ZnO nanomaterials with Co3O4 doping mass fractions of 0%, 2.13%, 4.13%, and 6.13% were prepared by sol-gel method. In order to explain and confirm the influence of the incorporation of Co3O4 on the surface morphology and gas sensitivity of ZnO at a relatively low gas concentration, additional studies such as XRD, XPS, SEM, EDS and UV-vis
Mat. Res.. Publicado em: 11/04/2019
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3. Carbon based DLC films: Influence of the processing parameters on the structure and properties
ABSTRACT Hydrogenated carbon-based films, such as DLC (“Diamond Like Carbon”), have interesting properties such as excellent tribological behavior, low friction coefficient, high superficial hardness and good wear resistance; they are chemically inert and highly corrosion resistant. They are deposited by means of PACVD (plasma-assisted chemical vapor dep
Matéria (Rio J.). Publicado em: 19/07/2018
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4. Photoluminescence of Solvent-Selected Fluorescent Moieties in MEH-PPV Solutions and Films
In this work, we examined how photoluminescence in poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) is affected by morphology, dictated by the mode of preparation. For that, MEH-PPV dilute solutions in good and non-solvents, thick cast films with poly[methylmethacrylate] (PMMA) as inert matrix and spin-coated thin films were prepared. Thes
J. Braz. Chem. Soc.. Publicado em: 2018-03
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5. Influence of resin cement shade on the color and translucency of ceramic veneers
ABSTRACT Objective This in vitro study evaluated the effect of two different shades of resin cement (RC- A1 and A3) layer on color change, translucency parameter (TP), and chroma of low (LT) and high (HT) translucent reinforced lithium disilicate ceramic laminates. Material and Methods One dual-cured RC (Variolink II, A1- and A3-shade, Ivoclar Vivadent)
J. Appl. Oral Sci.. Publicado em: 2016-08
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6. Effects from Gold Electrodes on the Electron-Phonon Coupling of Poly(p-phenylenevinylene) Films
Interface effects between metal electrodes and organic films are crucial for the overall performance of organic electronics devices. We investigate effects from gold electrodes deposited on spin-coated films of poly(p-phenylene vinylene) (PPV). While a thin Au layer (16 nm) did not affect the absorption and emission spectra of PPV, a 64 nm thick Au layer ind
J. Braz. Chem. Soc.. Publicado em: 2015-09
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7. Multilayer Graphene Films Obtained by Dip Coating Technique
A dip coating system was projected and constructed to deposit a large range of thin films onto solid substrates. A microcontroller was used to control the deposition system. As an example of application multilayer graphene (MLG) films were deposited onto glass slices in order to obtain conductive films with relatively good light transmittance. The MLG flakes
Mat. Res.. Publicado em: 2015-08
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8. Syntesis of Carbon Nanostructures Near Room Temperature Using Microwave PECVD
Carbon nanostructures (nanotubes, nanofibers and nanosponges) were synthesized onto Si (001) substrates using a microwave assisted plasma enhanced chemical vapor deposition (PECVD) from C2H2-Ar mixtures at low substrate temperatures (120 °C). Catalytic films (Ni and Cu) 3 nm thick were used. Different structures were formed, depending on the C2H2 partial pr
Mat. Res.. Publicado em: 2015-08
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9. Thin films produced on 5052 aluminum alloy by plasma electrolytic oxydation with Red Mud-containing Electrolytes
In this paper, we propose the production of ceramic protective thin films by plasma electrolytic oxidation using red mud-containing electrolytes. The treatments were performed through the application of pulsed voltage (600 V, 200 Hz) during 300 seconds to aluminum samples immersed in electrolytic solutions with 5 g of red mud per liter of distilled water. Th
Mat. Res.. Publicado em: 2014-12
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10. The influence of covering methods on the nutritive value of corn silage for lactating dairy cows
The objective of this study was to evaluate the effect of covering methods on the nutritive value of corn silage and performance of dairy cows. Whole-plant corn was harvested at 340 g/kg of dry matter (DM) and ensiled for 135 d in horizontal silos covered with one of the following methods: oxygen barrier film (45-µm thick) + white-on-black polyethylene film
R. Bras. Zootec.. Publicado em: 2014-09
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11. Electrophoretic deposition of BaTi0.85Zr0.15O3 nanopowders
The present study reports the results of thick films (20-130 µm) produced through electrophoretic deposition of BaTi0.85Zr0.15O3 (BTZ) nanometric powders synthesized by the Pechini's method. The BTZ powderscalcined at 600°C/2h presented a single crystalline phase with an average particle size of ~20nm. To thick films deposition, a stable suspension of acet
Mat. Res.. Publicado em: 29/07/2013
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12. Effect of plasma fluorination variables on the deposition and growth of partially fluorinated polymer over PMMA films
In this work, an investigation was made of the modification of film surface of Poly(methylmethacrylate) (PMMA) using the plasma polymerization technique. PMMA films 10 µm thick were obtained by Spin-Coating starting from a chloroform solution (15.36% w/w). The films were exposed to the plasma of CHF3 at different gas pressures and exposure times to increase
Polímeros. Publicado em: 2013