Silicon Tips
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Effect of finishing and polishing on surface roughness of composite resins after bleaching
AIM : To evaluate the influence of finishing and polishing techniques on the surface roughness of two composite resins (CRs) subjected to bleaching procedure. METHODS : Forty-eight CR specimens were divided into six groups (n=8). For G1 to G3, a microhybrid CR (Opallis; FGM) was used, and G4 to G6, received a nanohybrid CR (Brilliant NewLine; Coltène/Wh
Braz. J. Oral Sci.. Publicado em: 2014-04
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2. Effect of different finishing: polishing systems on the surface roughness of two heat-treated composite resins
The aim of this study was to compare the surface roughness achieved by different finishing/polishing systems on two composite resins for direct use after thermic treatment. The specimens (n = 40 per group (G); G1 = Filtek™ P60; G2 = Fill Magic®) were set up on a matrix of stainless steel with circular internal niches (Ø = 10.0 mm; h = 2.0 mm). Next, they
Materials Research. Publicado em: 06/05/2011
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3. Projeto e fabricação de nao-estruturas por litografa interferometrica / Design and fabrication of nano-structures by interforometric lithography
In this work the interferometric lithography technique was developed for recording periodic relief nano-structures, one and bi-dimensional, on silicon and glass substrates. In particular, the work is focused in two directions: the study of the profile of the structures recorded in photorresist, through the superimposition of interference light patterns, and
Publicado em: 2008
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4. Síntese de nanotubos de carbono orientados e aplicação na produção de pontas de AFM / Oriented growth of carbon nanotubes and application in production of afm Tips
In this work multi walled carbon nanotubes (MWCNT) were obtained. The growth presented high density nanotubes oriented perpendicularly to the substrate, with about 20 m length and diameters between 20 and 60 nm. Catalytic films containing iron were used. These films were deposited from solution of iron nitrate (Fe(NO3)3.9H2O) in ethyl alcohol with concentrat
Publicado em: 2008
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5. Silicon nano-oxidation using AFM tips. / Nano-oxidação do silício utilizando sonda de AFM.
Local anodic oxidation of silicon using Atomic Force Microscopy (AFM) was investigated by applying a negative voltage between silicon nitride tip and Si surfaces. All samples were cleaned with an ammonium-based solution known in literature as standard cleaning 1 (SC1) or a dip in a diluted hydrofluoric acid solution followed by SC1 or, also, boiling in isopr
Publicado em: 2007
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6. Contribution to the study of ultra-sharp silicon microtips fabrication process / Contribuição ao estudo do processo de fabricação de microponteiras de silicio ultra-finas
In this work, we present a contribution to the study of ultra-sharp silicon microtips fabrication process using oxidation sharpening technique. The silicon microtips were fabricated and submitted to repeated oxidation steps and oxide strip to achieve ultra-sharp tips. SEM (Scaning Electronic Microscopy) investigation were performed to observe the gradual tip
Publicado em: 2007
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7. The role of fine particulate matter composition of PM2,5 and ROFA in the cell mutagenic potential and toxicity: a vegetable and animal bioassay study / Efeito da composição do material particulado fino, PM2,5 e residual oil fly ash (ROFA), como determinante do potencial mutagênico e tóxico celular: um estudo em bioensaios vegetais e animais
The association between atmospheric particulate matter (PM) and adverse human health effects have been consistently reported in epidemiological and experimental studies however, the ability to define the most important components involved in PM toxicity is hindered by its complex composition. In the present study we decided to further explore the effects of
Publicado em: 2006
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8. Fabrication and electrical characterization of field emission tips covered by DLC (Diamond Like Carbon) thin films / Fabricação e caracterização eletrica de ponteiras de emissão de campo recobertas com filme fino DLC (Diamond Like Carbon)
The objectives of this dissertation were the fabrication of silicon field emitter tips coated with diamond like carbon (DLC) thin films, and the study of its electrical behavior. We present the fabrication process of silicon tips that consists on four stages: photolithography, reactive ion etching SF6 plasma, thermal oxidation for sharpening, and the DLC dep
Publicado em: 2005
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9. Medidas do perfil da permissividade eletrica em interfaces solido-liquido, usando microscopia de força atomica
When immersed in water, several surfaces are electrically charged. Therefore, repulsive and attractive forces between the tip and the sample are detected during image generation by atomic force microscopy in aqueous medium. In the last decades repulsive forces have been attributed to electrostatic interactions, while attractive forces have been ascribed to v
Publicado em: 2001
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10. Carbon nanotube atomic force microscopy tips: Direct growth by chemical vapor deposition and application to high-resolution imaging
Carbon nanotubes are potentially ideal atomic force microscopy probes because they can have diameters as small as one nanometer, have robust mechanical properties, and can be specifically functionalized with chemical and biological probes at the tip ends. This communication describes methods for the direct growth of carbon nanotube tips by chemical vapor dep
The National Academy of Sciences.
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11. Microfabricated needles for transdermal delivery of macromolecules and nanoparticles: Fabrication methods and transport studies
Arrays of micrometer-scale needles could be used to deliver drugs, proteins, and particles across skin in a minimally invasive manner. We therefore developed microfabrication techniques for silicon, metal, and biodegradable polymer microneedle arrays having solid and hollow bores with tapered and beveled tips and feature sizes from 1 to 1,000 μm. When solid
National Academy of Sciences.