Nanopowder
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. The Effect of Co and Zn Addition on Densification and Electrical Properties of Ceria-Based Nanopowders
Abstract In this work, cobalt and zinc-doped Ce0.8Gd0.2O1.9 samples were prepared starting from a commercial nanopowder and compared to the undoped material. The powder samples were pressed and afterwards sintered by a two-step procedure, before characterization by X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy
Mat. Res.. Publicado em: 11/08/2016
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2. Mechanical, antibacterial and bond strength properties of nano-titanium-enriched glass ionomer cement
The use of nanoparticles (NPs) has become a significant area of research in Dentistry. Objective The aim of this study was to investigate the physical, antibacterial activity and bond strength properties of conventional base, core build and restorative of glass ionomer cement (GIC) compared to GIC supplemented with titanium dioxide (TiO2) nanopowder at 3% an
J. Appl. Oral Sci.. Publicado em: 2015-06
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3. Evaluation of antibacterial properties of Barium Zirconate Titanate (BZT) nanoparticle
So far, the antibacterial activity of some organic and inorganic compounds has been studied. Barium zirconate titanate [Ba(Zr xTi1-x)O3] (x = 0.05) nanoparticle is an example of inorganic materials. In vitro studies have provided evidence for the antibacterial activity of this nanoparticle. In the current study, the nano-powder was synthesized by sol-gel met
Braz. J. Microbiol.. Publicado em: 2014-12
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4. Effect of pH-induced nanopowder deagglomeration on sintering, microstructure and dielectric properties of Ba0.77Ca0.23TiO3 ceramics
Ba0.77Ca0.23TiO3 ceramics were produced in this work starting from nanopowders synthesized via a polymeric precursor method. By adjusting the pH values of the precursor solutions above 7, it was possible to prepare powders weakly aggregated and with a smaller particle size, both facts which traduced into an enhanced nanopowders' sintering process at comparat
Materials Research. Publicado em: 17/07/2012
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5. Synthesis, characterization and catalytic properties of nanocrystaline Y2O3-coated TiO2 in the ethanol dehydration reaction
In the present study, TiO2 nanopowder was partially coated with Y2O3 precursors generated by a sol-gel modified route. The system of nanocoated particles formed an ultra thin structure on the TiO2 surfaces. The modified nanoparticles were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) analysis, Zeta potent
Materials Research. Publicado em: 29/02/2012
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6. Investigações sobre a sinterização de sílica vítrea por plasma pulsado. / Investigations of vitreous silica sintering by spark plasma.
A obtenção da sílica vítrea pelo processo de sinterização por plasma pulsado (SPS), a partir de matérias-primas de diferentes estruturas (cristalina e amorfa) e diferentes granulometrias, foi investigada. Análises de difração de raios X, transmitância óptica, microscopia óptica e eletrônica de varredura, e medições de densidade foram realizad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/06/2011
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7. Nanoparticle assisted coagulation of aqueous alumina suspensions
Colloidal processing of ceramics offers a high potential to achieve homogeneous microstructures with improved material properties. In this study, a novel forming method is investigated, which was already applied successfully for the fabrication of ceramic matrix composites (CMC), but is also considered to be a suitable direct casting technique for the fabric
Materials Research. Publicado em: 29/11/2011
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8. Transition metal oxide nanopowder and ionic liquid: an efficient system for the synthesis of diorganyl selenides, selenocysteine and derivatives
Neste trabalho foi desenvolvido um método eficiente para a síntese de selenetos de diorganoíla e β-seleno aminas empregando Zn, quantidades catalíticas de ZnO nanoestruturado e líquidos iônicos (LI) como solventes recicláveis. Este sistema ZnO/LI apresentou alta eficiência nesta transformação, levando à formação dos produtos desejados em bons r
Journal of the Brazilian Chemical Society. Publicado em: 2010
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9. Synthesis and characterization of bismuth zinc niobate pyrochlore nanopowders
Bismuth zinc niobate pyrochlores Bi1.5ZnNb1.5O7 (alpha-BZN), and Bi2(Zn1/3Nb2/3)2O 7 (beta-BZN) have been synthesized by chemical method based on the polymeric precursors. The pyrochlore phase was investigated by differential scanning calorimetry, infrared spectroscopy, and X ray diffraction. Powder and sintered pellets morphology was examined by scanning el
Materials Research. Publicado em: 2007-09