Exfoliation
Mostrando 1-12 de 106 artigos, teses e dissertações.
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1. Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075
ABSTRACT In this study, the effects of heat treatments in the peak aged (T6), overaged (T73) and retrogression and reaging (RRA, retrogression at 200 °C for 10 min) on the microstructure, mechanical strength, exfoliation corrosion and intergranular corrosion of aluminum alloy 7075, has been investigated by optical microscope, scanning electron microscopy, t
Matéria (Rio J.). Publicado em: 19/07/2018
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2. Synthesis of Graphene Oxide and Functionalized CNT Nanocomposites Based on Epoxy Resin
ABSTRACT Lately, nanomaterials have been largely studied as reinforcements for epoxy resin. Although their usage is highly promising, the literature has reported some drawbacks regarding the improvement of mechanical properties in nanocomposites. These difficulties are usually due to dispersion of nanomaterials and its adhesion to the polymeric matrix. One a
J. Aerosp. Technol. Manag.. Publicado em: 16/07/2018
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3. Amorphization of Graphite Flakes in Gray Cast Iron Under Tribological Load
A gray cast iron disc, which had been submitted to a heavy duty automotive brake test, was examined with energy filtered transmission electron microscopy. A graphite flake in a convenient angular position showed the shear interaction of graphite layers with the iron matrix in nano-scale resolution. Atomic layers of graphite were wedged into the ferritic bulk
Mat. Res.. Publicado em: 28/05/2018
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4. Effect of compatibiliser on the properties of polypropylene/glass fibre/nanoclay composites
Abstract Glass fibre (GF), nanoclay (NC) and hybrid composites compatibilised with maleic anhydride polypropylene (MAPP) were prepared by extrusion and injection moulding. The fourier transform infra-red spectra revealed the characteristic absorption peaks of MAPP in the compatibilised GF and NC composites. A decrement in the peak intensity of X-ray diffrac
Polímeros. Publicado em: 21/05/2018
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5. Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite
Polyacrylic acid (PAA)/clay mineral (SWy-1) nanocomposites were prepared by intercalation in solution and their photostability was evaluated. For the nanocomposite films containing 5, 10 and 20 wt % in SWy-1 mass occurred intercalation along with some clay exfoliation, while for PAA/30%SWy-1, the intercalation of PAA chains into the clay interlayers was obse
Mat. Res.. Publicado em: 07/05/2018
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6. New Alternative to Produce Colored Polymer Nanocomposites: Organophilic Ni/Al and Co/Al Layered Double Hydroxide as Fillers into Low-Density Polyethylene
Green (Ni2+/Al+3) and pink (Co2+/Al+3) layered double hydroxides (LDH) (molar ratio of 3:1) were intercalated with several organic anions and used as functional colored fillers into low density polyethylene (LDPE) by melt mixing in amounts of 0.2 to 7 wt.%. Scanning electron microscopic (SEM) results of LDPE nanocomposites indicated that with low percentage
J. Braz. Chem. Soc.. Publicado em: 2017-12
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7. The Structure and Composition of Corrosion Product Film and its Relation to Corrosion Rate for Carbon Steels in CO2 Saturated Solutions at Different Temperatures
For carbon steels immersed in CO2 saturated solutions at different temperatures, the structure and the composition of corrosion product film formed on the steel surface were studied by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The corrosion rate of the steel was evaluated by potentiodynamic polari
J. Braz. Chem. Soc.. Publicado em: 2017-12
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8. Clinical performance of fluorescence-based methods for detection of occlusal caries lesions in primary teeth
Abstract We aimed to investigate the performance of fluorescence-based methods (FBMs), compared to visual inspection after histological validation, in detecting and assessing the activity status of occlusal carious lesions in primary teeth. One examiner evaluated 50 primary molars close to exfoliation in 24 children. Teeth were assessed using quantitative li
Braz. oral res.. Publicado em: 06/11/2017
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9. The influence of natural clay and organoclay vermiculite on the formation process of bionanocomposites with poly (3-hydroxybutyrate-co-3-hydroxyvalerate)
ABSTRACT During the last decades, a lot of research work focused on several biodegradable and biosourced polyesters for the purpose of reducing the non-degradable polymer wastes. These polyesters are particularly considered to be promising polymers for biomedical applications and short life-time products like packaging. As these packagings are rapidly discar
Matéria (Rio J.). Publicado em: 02/10/2017
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10. AVALIAÇÃO DE DIFERENTES ROTAS DE ESFOLIAÇÃO LÍQUIDA PARA OBTENÇÃO DE NANOLAMELAS DE NITRETO DE BORO HEXAGONAL
Hexagonal boron nitride (h-BN), graphite analogous structure, has many interesting applications due to its excellent thermal, electrical and mechanical properties. In this study, different routes of liquid exfoliation using solvent and ultrasound were used to obtain two-dimensional (2D) nanosheets of h-BN. The efficiency of the exfoliative routes was evaluat
Quím. Nova. Publicado em: 2017-09
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11. Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil
Organic-inorganic nanocomposites based on cassava starch, glycerol and chitosan-modified Veegum® HS clay mineral at two different low polymer-to-clay ratios (2.5 and 5.0 wt.%) were prepared by extrusion producing flexible, transparent and homogeneous plastics as potential candidates for agricultural purposes. X-ray diffraction and transmission electron micr
J. Braz. Chem. Soc.. Publicado em: 2017-04
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12. High prevalence of human papillomavirus (HPV) in oral mucosal lesions of patients at the Ambulatory of Oral Diagnosis of the Federal University of Sergipe, Northeastern Brazil
Abstract The role of human papillomavirus (HPV) in oral carcinogenesis is still controversial as detection rates of the virus in oral cavity reported in the literature varies greatly. Objective The aim of this study was to evaluate the frequency of HPV infection and its genotypes in patients with oral lesions at the Ambulatory of Oral Diagnosis of the Fede
J. Appl. Oral Sci.. Publicado em: 2017-02