Viscosimetry
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Produção, caracterização e avaliação in vitro de partículas de quitosana e hidroxiapatita para substituição óssea
Resumo Objetivou-se desenvolver, caracterizar e avaliar in vitro biomateriais compósitos de quitosana com hidroxiapatita (CHI/HA) para atuarem como substitutos ósseos. As quitosanas de baixa (L-CHI) e média (M-CHI) massa molecular foram previamente caracterizadas por gravimetria, viscosimetria e espectrofotometria ultravioleta. Os compósitos de CHI/HA fo
Cerâmica. Publicado em: 14/11/2019
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2. Analysis of chemical polymerization between functionalized MWCNT and poly(furfuryl alcohol) composite
Abstract In this study, the chemical interaction between functionalized carbon nanotuboes with carboxyl groups (CNT-f) and the subsequent addition of furfuryl alcohol (FA) and mixture with poly(furfuryl alcohol) (PFA) resin was evaluated. The FA with CNT-f was mixed in PFA resin to facilitate the chemical interaction of CNTs. The morphological and chemical
Polímeros. Publicado em: 15/03/2018
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3. Degradation of Poly(Ethylene Oxide) Films Using Crystal Violet
The present study aimed to investigate the degradation of poly(ethylene oxide) (PEO) in the presence of cationic dye crystal violet irradiated under visible light. The preparation of the samples was done in the form of films obtained by casting. Degradation tests were carried out by 120 hours at room temperature. The degradation kinetics of the dye and polym
Mat. Res.. Publicado em: 01/02/2018
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4. Influência do alinhamento de nanotubos de carbono nas propriedades elétricas de nanocompósitos de matriz epoxídica / Influence of the alignment of carbon nanotubes in the electrical properties of epoxy matrix nanocomposites
Epoxy resin / carbon nanotubes (CN) composites are widely used due to the versatile matrix phase and the excellent properties of the reinforcing phase. However, the development of polymer nanocomposites still faces three important challenges: interfacial interaction, dispersion and orientation of the reinforcing phase. This work studied the orientation proce
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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5. Physico-chemical, spectroscopical and thermal characterization of biodiesel obtained by enzymatic route as a tool to select the most efficient immobilized lipase
Two microbial lipases from Burkholderia cepacia and Pseudomonas fluorescens were evaluated as catalysts for the enzymatic transesterification of beef tallow with ethanol and the most efficient lipase source was selected by taking into account the properties of the product to be used as fuel. Both lipases were immobilized on an epoxy silica-polyvinyl alcohol
Brazilian Journal of Chemical Engineering. Publicado em: 2012-03
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6. Estudo físico-químico de copoliéteres por viscosimetria / Physical-chemical study of copolyethers by viscosimetry
A viscosimetria é um procedimento experimental simples e pouco oneroso, que pode fornecer informações valiosas sobre o volume hidrodinâmico e a conformação de macromoléculas em solução, num determinado solvente, em uma dada temperatura. Os parâmetros viscosimétricos podem ser matematicamente calculados por extrapolação gráfica, cuja execução
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2009
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7. Dynamic light scattering and viscosimetry of aqueous solutions of pectin, sodium alginate and their mixtures: effects of added salt, concentration, counterions, temperature and chelating agent
Efeitos de adição de sal, concentração, presença de contraíons, temperatura e agente quelante em soluções aquosas de pectina, alginato de sódio e misturas destes foram analisadas por viscosimetria e espalhamento de luz dinâmico (DLS). A viscosidade intrínseca dos sistemas binários diminuiu com a adição de sal e com o aumento da temperatura, por
Journal of the Brazilian Chemical Society. Publicado em: 2009
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8. Alquilação redutiva da quitosana a partir do glutaraldeído e 3-amino-1-pr / Reductive alkylation of chitosan by glutaraldehyde and 3-amino-1-propanol
Chitosan derivatives were prepared by reductive alkylation using glutaraldehyde and 3-amino-1-propanol. The reducing agent used was the sodium borohydride. Tests of solubility, stability and viscosity were performed in order to evaluate these parameters effects in the reaction conditions (molar ratio of the reactants and presence of nitrogen in the reaction
Publicado em: 2008
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9. DETERMINING THE START OF PRECIPITATION ASPHALTENES IN BRAZILIAN CRUDE OIL AND THE IMPLICATIONS OF THE STABILITY IN CRUDE OILS MIXTURES / DETERMINAÇÃO DO INÍCIO DE PRECIPITAÇÃO DOS ASFALTENOS EM PETRÓLEOS BRASILEIROS E IMPLICAÇÕES NA ESTABILIDADE DE MISTURAS DE PETRÓLEOS
The crude oil can be understood as a mixture sufficiently polydisperse where its diverse components form a dispersion and/or solution whose original state can be modified in function of variations of temperature, pressure and composition causing, for example, the formation of organic deposits. The asphaltene constitutes heavy fractions of oils with great cap
Publicado em: 2006
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10. Processamento viscoplástico e conformação cerâmica por rolos a frio a partir de suspensões concentradas de alumina. / Viscoplastic processing, and roll pressing, of ceramic bodies by concentrated alumina suspensions.
Plastic forming, followed by roll-pressing, allows to shape ceramic bodies with thickness that are useful for electronic and pavement ceramics. This work introduces an alternative route to processing ceramic plastic mixes. The first step comprehended the selection of suitable raw materials with the aim of assure the best packing of particles, followed by dec
Publicado em: 2005
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11. UTILIZAÇÃO DE PARÂMETROS REOLÓGICOS PARA VERIFICAR A APTIDÃO AO DESAGUAMENTO DE LODOS DE UMA ESTAÇÃO DE TRATAMENTO DE ESGOTOS DO TIPO UASB + BFs CONDICIONADOS COM POLIELETRÓLITOS
This research aims at the rheological description of the sludge produced by an UASB + BAF wastewater treatment works and evaluates the application of the rheological parameters on the selection of polyeletrolyts, and its optimal dose, used to increase the sludges dehydration ability. The tests with raw sludge included rotational rheo-viscosimetry, cup with a
Publicado em: 2003
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12. Preparação, caracterização e aplicação de membranas polimericas microporosas assimetricas
This work starts with the preparation of asymmetric microporous polymeric membranes through phase inversion technique by immersion-coagulation in the presence of a non-solvent. The poly (vinylidene fluoride)-PVDF was used pure or blended with lithium chloride and one of the following polymeric additives: poly (vinyl acetate)-PVAc or poly (ethylene glycol)-PE
Publicado em: 2002