Graphite Oxide
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. CuO Nanofibers Immobilized on Paraffin-Impregnated Graphite Electrode and its Application in the Amperometric Detection of Glucose
1-D nanostructures are promising materials for development of electrochemical devices offering benefits such as fast electron transfer rates and large surface areas. Copper oxide nanofibers (CuO-NFs) synthesized by electrospinning technique and subsequent thermal treatment, were used to modify paraffin-impregnated graphite electrode (PIGE) for a sensitive
J. Braz. Chem. Soc.. Publicado em: 2015-08
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14. Facile Graphene Oxide Preparation by Microwave-Assisted Acid Method
Few-layered graphene oxide (GO) was prepared using a fast and energy-saving method by microwave-assisted acid technique. The oxygenated groups existing on the GO surface were determined using UV-Vis, X-ray photoelectron and Fourier-transform infrared spectroscopies. An oxygenated group percentage of 30% in mass for the GO was observed by thermogravimetric an
J. Braz. Chem. Soc.. Publicado em: 2015-05
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15. Efeito da variação de parâmetros reacionais na preparação de grafeno via oxidação e redução do grafite
This work shows the influence of several reactional parameters for obtaining graphene through successive steps of oxidation and exfoliation of bulk graphite (resulting in graphene oxide), followed by chemical reduction. The results showed that changes in temperature, reaction time, reducing agent and source of primary graphite lead to different surface compo
Quím. Nova. Publicado em: 2014
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16. Produção de grafeno a partir do óxido de grafite e sua aplicação em nanocompósitos de matriz epoxídica / Production of graphene from graphite oxide for application in epoxy matrix nanocomposites
O grafite é a fonte mais abundante e de baixo custo para obtenção de grafeno. Para uma produção em larga escala de grafeno e sua aplicação em nanocompósitos, o método de redução do óxido de grafite (OG) tem sido o mais utilizado. Com a oxidação do grafite, grupos funcionais, são introduzidos na sua estrutura e causam o afastamento dos planos c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/10/2011
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17. Estudo e desenvolvimento de grafite como agente anti-chama para PVC / Study and development of graphite as fire retardant agent for PVC.
O PVC é um dos principais polímeros termoplásticos da atualidade graças à sua grande versatilidade. Entretanto, uma de suas características é a baixa estabilidade térmica, sendo necessário o emprego de aditivos em sua estrutura. Uma das maiores preocupações mundiais é a segurança, sendo que muitos produtos levam proteção anti-chama em sua comp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/2011
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18. Sintese de nanotubos de carbono por CVD utilizando catalisadores à base de ferro e molibdênio suportados em matrizes cerâmicas
Molybdenum is known for its synergistic effect in the synthesis of carbon nanotubes (CNs) by chemical vapor deposition (CVD method). When added to typical catalysts like iron, nickel, and cobalt, even in small quantities, it is increases the yield of these nanostructures. The presence of Mo also has an influence on the type and number of CN walls formed. Alt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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19. Eletrodos modificados com agentes biológicos por diferentes procedimentos de imobilização
A carbon paste electrode modified with enzyme laccase productNovozym 51.003 has been proposed in this manuscript. This enzyme catalyzesthe oxidation of different types of phenols compounds, and lignin aminefunctional groups engaged. This enzyme has been among the most applied inthe construction of biosensor amperometric Electrical. The effect of laccaseamoun
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2009
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20. Exposição aguda ao material particulado total em suspensão proveniente de diferentes fontes e suas repercussões nas respostas inflamatórias, sistêmica e local, em ratos / Acute exposure to total suspended particles from different sources and their impacts on both systemic and local inflammatory responses in rats
Background: Air pollution is associated with both increased morbidity and mortality. These associations persist even at lower concentrations and shortterm exposure. Objectives: To assess the impact of the components of three different sources of Total Suspended Particles (TSP) on local and systemic inflammatory responses in healthy rats. Methods: TSP from au
Publicado em: 2007
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21. Remediation of cadmium- and lead-contaminated soils with an aluminum industry by-product / Subproduto da indÃstria de alumÃnio na remediaÃÃo de Ãreas contaminadas com cÃdmio e chumbo
Mining activities have been increasing each day and generate large amounts of residues or by-products, which have caused a lot of interest by researchers in evaluating their potential use as soil amendments. One of the applications of such amendments is on the remediation of soils contaminated with trace elements, which might pose a threat to animals and pla
Publicado em: 2006
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22. Dilatometric studies of (SiO2-RE2O3-Al2O3) silicon carbide ceramics
Silicon carbide is an important structural ceramic and finds applications as abrasives, as a refractory and in automotive engine components. This material can attain high densities during liquid phase sintering if suitable additives are used. Silicon carbides containing silica, alumina and rare earth oxides have suitable characteristics to promote liquid pha
Materials Research. Publicado em: 2005-06
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23. Abiotic, Graphitic Microstructures in Micaceous Metaquartzite about 3760 Million Years Old from Southwestern Greenland: Implications for Early Precambrian Microfossils
An Early Precambrian micaceous metaquartzite subjected to low to moderate metamorphism in the Isua area of Southwestern Greenland was derived from the erosion of preexisting rocks which were probably sialic in composition. This metaquartzite may have been formed before the emergence of life. It contains globular particles of graphite arranged in narrow veins
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24. H3PW12O40-functionalized tip for scanning tunneling microscopy
Recent reports of C60-functionalized metal tips [Kelly, K. F., Sarkar, D., Hale, G. D., Oldenburg, S. J. & Halas, N. J. (1996) Science 273, 1371–1373] and carbon nanotube tips [Dai, H., Hafner, J. H., Rinzler, A. G., Colbert, D. T. & Smalley, R. E. (1996) Nature (London) 384, 147–151] demonstrate the potential of controlling the chemical identity and geo
The National Academy of Sciences.