Conductivimetry
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Estudo das dispersões aquosas de nanotubos de carbono utilizando diferentes surfactantes
The dispersion of carbon nanotubes in water for their utilization in nanoscale devices is a challenging task. Comparative studies on interaction and dispersion of multi-wall carbon nanotubes (MWNT) using two different surfactants (sodium dodecyl sulfate, SDS, and polyoxyethylenesorbitanmonooleate, Tween 80) are presented. The interaction between carbon nanot
Quím. Nova. Publicado em: 2013
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2. Avaliação da biodegradabilidade de petróleo utilizando microrganismos isolados do estuário do Rio Potengi (RN)
A atividade petrolífera do RN constitui uma ameaça permanente aos ecossistemas costeiros, principalmente os manguezais, com a possibilidade de derramamentos de óleo. Neste contexto, o objetivo desse estudo foi avaliar o potencial de resistência do ambiente de manguezal a um possível derramamento. Foram selecionados e isolados microrganismos degradadores
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/08/2010
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3. SÍNTESE E CARACTERIZAÇÃO DE COMPLEXOS DE COBRE (II) E ZINCO (II) COM DIPEPTÍDEOS DE INTERESSE BIOLÓGICO / SYTHESIS AND CHARACTERIZATION OF COPPER (II) AND ZINC (II) COMPLEXES WITH DIPEPTIDES OF BIOLOGICAL INTEREST
This work describes the synthesis and characterization of copper (II) and zinc (II) complexes, with dipeptides in solid state. The dipeptides involved were: glycyl-glycine, glycyl-valine, methionyl-methionine, methionyl-glycine and cysteinyl-glycine, whose aminoacids take part in some proteins involved in neurodegeneration processes, more specifically in Alz
Publicado em: 2010
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4. Determinação em fluxo do carbonatoresidual do solo empregando pervaporação
The objective of this study was to develop a method for the direct determination of residual CO3(2-) in acid soil using a flow system coupled with pervaporation. The gas released from the acidified sample was separated though a hydrophobic membrane and detected by conductivimetry. The detection limit was 0.054 mmol c kg-1 for CO2/CO3(2-) with relative error
Química Nova. Publicado em: 2002-02
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5. Diagrama de fases do sistema brometo de cetiltrimetilamonio - silicato de tetrametilamonio - agua
The molecular sieves of the M41S family have been studied since their discovery in 1992, however, the mechanism of their formation is not yet very clear. In this work, a phase diagram for the system cetyltrimethylammonium bromide (CTAB)/tetramethylammonium silicate/water has been constructed, in order to obtain basic information on the interactions that exis
Publicado em: 2002
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6. Determinação condutométria de carbonato residual do calcário aplicado no solo por análise em fluxo
The objective of this study was to evaluate a flow injection system for determination of residual CO3(2-) in soil amended with lime material. It was used a closed system were the CO2 released from soil sample acidified with 0.5 mol L-1 HCl was capted in a 0.2 mol L-1 NaOH solution. After 16h the capted CO2 was determined by conductivimetry using a flow injec
Química Nova. Publicado em: 2000-08