Carbon Nanostructures
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Development of metakaolin and geopolymer proppants with nanocarbon materials
Abstract From the first hydraulic fracturing in the 40’s until nowadays, the techniques of each process step have evolved significantly. This study presents a new approach on the development of metakaolin (MK) and geopolymer based proppant with and without nanocarbon materials such as multi-walled carbon nanotubes and graphene oxide. For manufacturing the
Cerâmica. Publicado em: 2019-01
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2. Use of Amphiphilic Composites based on Clay/Carbon Nanofibers as Fillers in UHMWPE
In this work, it is proposed a new strategy to improve the dispersion of inorganic fillers in polymeric matrices by producing surface carbon nanostructures. Clay/carbon nanofibers particles were prepared and used as fillers to improve the mechanical and thermal properties of ultra-high molecular weight polyethylene (UHMWPE). Thermogravimetry (TG), differenti
J. Braz. Chem. Soc.. Publicado em: 2018-02
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3. Experimental Multi-scale analysis of Carbon/Epoxy Composites Nano-Reinforced by Carbon Nanotubes/Multi-layer Graphene
Nano-size structures, nanotubes/multi-layer graphene (CNT/MLG), were dispersed into epoxy system by a combination of sonication and high shear mixing. To avoid CNT/MLG agglomeration, a non-covalent functionalization were performed using surfactants, CO890 - Polyoxyethylene (40) nonylphenyl ether and SDBS - sodium dodecyl benzene sulfonate. Raman spectroscopy
Mat. Res.. Publicado em: 22/01/2018
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4. The Carbon Nanotubes Effect into Single-lap Joint Failure Modes and Load Capacity: a Macromechanical Analysis
This study investigates the influence of the adhesive (epoxy resin) thickness and the dispersions of non-functionalized carbon based nanostructures (carbon nanotubes - CNT) on mechanical properties of single-lap bonded joints. To achieve this goal, three CNT concentrations (0.5%, 1.0% and 2.0% m/m); and three different bondline thicknesses (0.05 mm, 0.15 mm
Mat. Res.. Publicado em: 22/01/2018
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5. Band Structure in Carbon Nanostructure Phononic Crystals
We investigate the band structure of elastic waves propagating in carbon nanostructure phononic crystals with square, rectangular, triangular, honeycomb and Kagomé lattices. We also study the influence of carbon nanostructure cross section geometry - circular, hollow circular, square and rotated square with a 45° angle of rotation with respect to the x and
Mat. Res.. Publicado em: 27/11/2017
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6. Carbon nanotube buckypaper reinforced polymer composites: a review
Abstract This review provides valuable information about the general characteristics, processing conditions and physical properties of carbon nanotube buckypaper (BP) and its polymer composites. Vacuum filtration is the most common technique used for manufacturing BP, since the carbon nanotubes are dispersed in aqueous solution with the aid of surfactant. Pr
Polímeros. Publicado em: 21/09/2017
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7. Multifunctional Nanocomposites between Different Carbon Nanostructures and Styrene Acrylic Latex
This work describes the preparation, characterization and properties study of multifunctional nanocomposites between poly(styrene-co -butyl acrylate) latex and different carbon nanostructures: iron-filled carbon nanotubes (CNT), graphene or graphene oxide. Different approaches were employed to prepare stable aqueous dispersions of these nanostructures, accor
J. Braz. Chem. Soc.. Publicado em: 2017-08
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8. Preparation and Performance of TiO2-ZnO/CNT Hetero-Nanostructures Applied to Photodegradation of Organic Dye
Water pollution by organic compounds is one of the major challenges faced by industries that use dyeing processes. Thus, some methods were developed for degrading dyes in wastewaters, including heterogeneous photocatalysis by semiconductor oxides. However, these oxides have limited photocatalytic activity due to the fast recombination of photogenerated elect
Mat. Res.. Publicado em: 03/10/2016
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9. 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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10. Nano-modified adhesive by graphene: the single lap-loint case
This paper addresses the performance study on, low viscosity, nano-modified adhesives by graphene. For achieving this goal, single-lap joints following ASTM D 5868-01 were manufactured and tested. X-ray diffraction, scanning electron microscopy and nanoindentation were employed for graphene based nanostructures characterization. The increase on joint strengt
Mat. Res.. Publicado em: 19/02/2013
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11. Nanoestruturas de carbono (nanotubos, grafeno): Quo Vadis?
We describe general considerations about the present and the future standing of carbon nanostructures, mainly carbon nanotubes and graphene. Basic concepts and definitions, select structure/property relationships, and potential applications are reviewed. The analysis of the global market for these nanostructures, the commercial products available currently,
Quím. Nova. Publicado em: 2013
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12. Desenvolvimento de materiais e métodos de fabricação de sensores químicos/bioquímicos baseados em silício e nanoestruturas de carbono (ISFET, CNTFET e GraFET) : Development of materials and methods of fabrication of chemical/biochemical sensors based on silicon and carbon nanostructures (ISFET, CNTFET and GraFET) / Development of materials and methods of fabrication of chemical/biochemical sensors based on silicon and carbon nanostructures (ISFET, CNTFET and GraFET)
Este trabalho teve como objetivo o desenvolvimento de materiais e métodos avançados de fabricação de sensores químicos/bioquímicos. Utilizando equipamentos disponíveis no Centro de Componentes Semicondutores da UNICAMP, foram desenvolvidos e caracterizados filmes finos de alta constante dielétrica e filmes metálicos. Os materiais desenvolvidos foram
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2012