Interfacial Tension
Mostrando 13-24 de 57 artigos, teses e dissertações.
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13. Bioprospecção de genes envolvidos na síntese de biossurfactantes a apartir de microbiota de resevatórios de petróleo / Bioprospection of genes involved in the synthesis of biosurfactants from braziliam petroleum reservoirs microbial communities
Bioemulsifiers or biosurfactants are compounds produced by microorganisms which enhance the bioavailability of hydrophobic substances promoting the stabilization of substances with different polarities, like oil-in-water emulsion occurring in petroleum reservoirs. The samples used in this work were collected in the Potiguar Basin (RN, Brazil), and employed a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/07/2010
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14. AVALIAÇÃO DA TENSÃO INTERFACIAL ENTRE PETRÓLEO PARAFÍNICO E SUPERFÍCIES COM RESINAS EPÓXI / EVALUATION INTERFACIAL TENSION BETWEEN PARAFFIN OIL AND SURFACES WITH EPOXY RESINS
Oil is a very complex chemical system, as for instance, the paraffinic type which was considered as a fluid to be evaluated in this scientific paper, trough the static interfacial tension with the surfaces of the API 5L grade B conduction pipe and the EPOXY and EPOXY M resins. The paraffinic oil produced in the 7-PIR-244D-AL well, which is located in the pro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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15. EVALUATION INTERFACIAL TENSION BETWEEN PARAFFIN OIL AND SURFACES WITH EPOXY RESINS / AVALIAÇÃO DA TENSÃO INTERFACIAL ENTRE PETRÓLEO PARAFÍNICO E SUPERFÍCIES COM RESINAS EPÓXI
Oil is a very complex chemical system, as for instance, the paraffinic type which was considered as a fluid to be evaluated in this scientific paper, trough the static interfacial tension with the surfaces of the API 5L grade B conduction pipe and the EPOXY and EPOXY M resins. The paraffinic oil produced in the 7-PIR-244D-AL well, which is located in the pro
Publicado em: 2010
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16. Ácido cítrico como compatibilizante entre amido e poliéster em filmes tubulares produzidos por extrusão
Blends of thermoplastic starch and polyesters, as PBAT may be immiscible at the molecular level. The use of compatibilizing agents such as citric acid, could reduces the interfacial tension between polymer phases (starch/PBAT) improving the mechanical properties and water vapor permeability of films produced by extrusion. Extruders are used as chemical react
Publicado em: 2010
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17. Propriedades físico-químicas do surfatante cataniônico dodecilsulfato de dodecildimetil-n-hidroxilamônio / Physical-chemical properties of catanionic surfactant dodecyldimehyl-n-hydroxylamonium dodecylsuphate
The catanionic surfactant dodecyldimehyl-n-hydroxylamonium dodecylsulphate was prepared and its physical-chemical properties were characterized. The surfactant presented very low water solubility, but with ability to reduce the surface tension and the interfacial tension between water and xylene, in both situations with slow kinetics of interface saturation.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2009
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18. The influence of ethoxylation degree in the behaviour of secondary alcohol ethoxylates / Influência do grau de etoxilação no comportamento de álcoois secunários etoxilados
The solubilization of non-ionic solutes via partitioning between water and the micellar pseudophase of non-ionic surfactants was evaluated for a series of secondary alcohol ethoxylates with hydrophile length varying from 7 to 40 ethylene oxide units. It was demonstrated that the micellar incorporation constant, Ks, is not dependent on the hydrophile length o
Publicado em: 2009
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19. Aerobic and anaerobic biodegradation of petroleum from Pampo Sul Field, Campos Basin, RJ, Brazil / Biodegradação aerobia e anaerobia de petroleo do Campo Pampo Sul, Bacia de Campos, RJ
The main purpose of this thesis was the simulation of petroleum biodegradation processes under reservoir aerobic, anaerobic or mixed conditions. The biodegradation experiments were first adapted to the laboratory scale in order to simulate different reservoir conditions taking care to select the best parameters to accelerate million times the biodegradation
Publicado em: 2009
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20. Interfacial tension of PBT/SAN blends by the drop retraction method
The aim of this work was to evaluate the interfacial tension from the poly(butylene terephtalate) and poly(styrene-co-acrylonitrile) (PBT/SAN) interface region using the drop retraction method. SAN filaments were sandwiched between two PBT films; the whole system was heated up to 240 °C, in a hot stage coupled to an optical microscope. The rheological param
Materials Research. Publicado em: 2008-06
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21. Avaliação da tensão superficial do PVB e da PA-6. / Evaluation of surface tension of poly(vinyl butyral) and nylon-6.
In the Rheology and Polymer Processing Laboratory of Escola Politécnica of the University of São Paulo, Polyamide-6 / poly(vinyl butiral) film blends have been studied as an alternative for the recycling of post-consumption laminated glasses. The mechanical properties of these blends were studied and explained in light of their morphology. The morphology o
Publicado em: 2008
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22. Rheological behavior of PMMA/PS polymer blends compatibilized or not. / Estudo do comportamento reológico da mistura polimérica PMMA/PS compatibilizada ou não.
In this work, the dynamic behavior of polymethylmetacrylate/polystyrene (PMMA/PS) blends to which P(S-co-MMA) was added was studied. Several blend composition and copolymer concentrations were studied. The rheological behavior of blends was compared to Bousminas[1] and Paliernes generalized[2] models. The relaxation spectra of the blends were also inferred,
Publicado em: 2008
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23. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal
Na indústria petrolífera, a água está associada ao petróleo e ao gás natural, formando a água de produção e gerando um grande impacto ambiental. Existem diversos métodos de tratamento para as águas oleosas, tais como: vasos gravitacionais, sistemas de filtração em meio granular, flotação, centrifugação e utilização de hidrociclones, podend
Publicado em: 2008
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24. Characterization of thin titanium oxite films for ISFET application / Caracterização de filmes finos de oxido de titanio obtidos atraves de RTP par aplicação em ISFETs
This work presents the characterization of thin titanium oxide films as potential dielectric to be applied in ion sensitive field effect transistors. The films were obtained through rapid thermal oxidation and annealing of titanium thin films of different thicknesses deposited by Ebeam evaporation on silicon wafers. These films were analyzed by Ellipsometry,
Publicado em: 2008