Polyelectrolytes
Mostrando 13-24 de 52 artigos, teses e dissertações.
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13. Supramolecular assemblies of drugs in synthetic lipid and/ or polyelectrolytes: colloid stability and in vitro activity / Arranjos supramoleculares de drogas em lípides sintéticos e/ ou polieletrólitos: estabidade coloidal e atividade in vitro
Formação, estabilidade coloidal e atividade in vitro contra Candida albicans dos arranjos supramoleculares compostos por drogas, lípides catiônicos e/ ou polieletrólitos foram sistematicamente avaliados através de espalhamento de luz dinâmico para tamanho de partículas, análise de potencial-zeta, espectrofotometria UV-visível, efeitos de droga sobr
Publicado em: 2008
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14. Nanocompósitos eletroativos de poli-o-metoxianilina e polissacarídeos naturais
In this work we take advantage of the polyelectrolyte character of some Brazilian native gums to fabricate electrically conductive, nanostructured films. The gums Sterculia urens, (caraia), Sterculia striata (chicha) or Anadenanthera macrocarpa Benth were assembled in conjunction with poly(o-methoxyaniline) (POMA) in the form of layered nanostructured films
Química Nova. Publicado em: 2007-10
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15. Vibrational spectroscopy of self-assembled polyelectrolytes films by sum-frequency generation / Espectroscopia vibracional de filmes automontados de polieletrólitos através da geração de soma de frequências
In this work, Sum-Frequency Vibrational Spectroscopy, a nonlinear optical technique that is sensitive to molecular conformation at interfaces and surfaces, was used to characterize the molecular ordering of self-assembled films during all steps of self-assembly, having as model poly(allylamine hydrochloride) (PAH) / poly(styrene sulfonate) (PSS) polyelectrol
Publicado em: 2007
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16. Estudo do equilibrio de fases e de estruturas de complexos formados entre polietilenoiminas e dodecilsulfato / Phase equilibria and structural study of polyethyilenoimine and dodecylsulfate complexes
Polyelectrolytes associate strongly with oppositely charged surfactants in water, being able to generate liquid crystalline phases with interesting supramolecular structures. The geometry of the liquid crystalline phase depends on parameters such as: concentration, surfactant/monomer ratio, polymer characteristics and presence of cosolvents. The objective of
Publicado em: 2007
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17. Drenagem de espumas gás-líquidos e influência da presença de partículas e anti-espumantes / Air-liquid foams drainage and influence of the presence of particles and antifoams
This Dissertation presents results of two comercial antifoams on the stability of gas-liquid foams formed in the presence of an anionic surfactant, a non-ionic surfactant and colloidal particles. Air-liquid foams are colloidal systems formed by air bubbles separated by liquid films. The drainage or flow of the liquid contained within these films pass through
Publicado em: 2007
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18. Valuation of performance of dissolved air flotation on treatment of wastewaters of soybean oil refining / AvaliaÃÃo do desempenho de flotaÃÃo por ar dissolvido no tratamento de efluente de refinaria de Ãleo de soja
The aim of this work was to value the performance of three types of coagulants, two of them of polichlorate of alum class and one of them was organic, combined to three polyelectrolytes class (anionic, cationic and no ionic) applying the dissolved air flotation (DAF), to viability their use on treatment of effluents of soybean oil refinery. The study was con
Publicado em: 2007
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19. "Estabilização de suspensões aquosas de alumina pela adição de taninos e quitosana quaternizada" / Stabilization of aqueous alumina suspensions by addition of tannin and quaternized chitosan
The ceramic industry provides products for several areas, and new processing techniques became necessary to meet the quality requirements. The objective is to produce more homogeneous green microstructures (bodies before burning), with lower number of micro-defects. Such materials can be produced from aqueous suspensions of aluminum oxide (Al2O3), known as a
Publicado em: 2005
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20. Lamella design (high rate) and conventional flotation units applied to the post-treatment of the effluent from a system made up anaerobic reactor followed by aerobic reactor treating domestic sewage / Emprego da flotação lamelar de alta taxa e convencional como pós-tratamento do efluente de sistema constituído de reator anaeróbio seguido de reator aeróbio tratando esgoto sanitário
The aim of this research was the study of the lamella design (high rate) and conventional dissolved air flotation (DAF) process potentiality of application as the final part of a domestic sewage sequential treatment system made up anaerobic reactors (UASB) followed by aeration tank. The work, developed at the Jardim das Flores WWTP of Rio Claro city, was sep
Publicado em: 2005
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21. Redução de poluentes de efluentes das indústrias de papel e celulose pela floculação/coagulação e degradação fotoquímica
The abatement of recalcitrant lignin macromolecules from effluents of pulp and paper industry was investigated by combined process. Flocculation and coagulation with aluminum sulfate and natural polyelectrolytes extracted from cactus Cereus peruvianus were used in the first step. After separation of solid residues by filtration, the photochemical methods usi
Química Nova. Publicado em: 2002-09
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22. DNA-lipid systems: A physical chemistry study
It is well known that the interaction of polyelectrolytes with oppositely charged surfactants leads to an associative phase separation; however, the phase behavior of DNA and oppositely charged surfactants is more strongly associative than observed in other systems. A precipitate is formed with very low amounts of surfactant and DNA. DNA compaction is a gene
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-05
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23. Production of fungal protein by solid substrate fermentation of cactus Cereus peruvianus and Opuntia ficus indica
Agricultural wastes from cactus Cereus peruvianus and Opuntia ficus indica were investigated for protein production by solid substrate fermentation. Firstly, the polyelectrolytes were extracted and used in water cleaning as auxiliary of flocculation and coagulation. The remaining fibrous material and peels were used as substrate for fermentation with Aspergi
Química Nova. Publicado em: 2001-06
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24. Filmes poliméricos ultrafinos produzidos pela técnica de automontagem: preparação, propriedades e aplicações
The self-assembly technique is a powerful tool to fabricate ultrathin films from organic compounds aiming at technological applications in molecular electronics. This relatively new approach allows molecularly flat films to be obtained on a simple and cheap fashion from various types of material, including polyelectrolytes, conducting polymers, dyes and prot
Química Nova. Publicado em: 2001-04