Polyelectrolyte
Mostrando 25-36 de 94 artigos, teses e dissertações.
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25. Post-treatment of effluents from anaerobic reactor treating domestic sewage by flotation/filtration pilot system with cationic synthetic polymers / Emprego de polímeros em unidade piloto de floto-filtração como pós-tratamento de efluentes de reatores anaeróbios de leito expansível tratando esgoto sanitário
This work assessed the performance of domestic sewage treatment pilot unit consisting of anaerobic reactor followed dissolved-air flotation/filtration (DAFF). Associated ferric chloride was used polyelectrolytes. First, was tested in lab-scale dissolved-air flotation (LSDAF), low dosages of cationic synthetic polymer with high molecular weight as aiding of f
Publicado em: 2008
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26. 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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27. Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization
Poly(vinyl alcohol) (PVA) hydrogels were obtained by freezing (-22 °C) and thawing (+25 °C) process, resulting in a semi-interpenetrating polymer network (s-IPN) with a sulfonated polyester (PES). The cryo-gels samples were analysed in terms of its water uptake capacity (WU) as a function of pH, temperature and ionic strength. WU of all samples were relati
Materials Research. Publicado em: 2007-03
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28. Obtenção de dispersões de complexos polieletrolíticos à base de quitosana e poli(ácido metacrílico) e análise de adsorção de albumina bovina sérica
Dispersions composed of polyelectrolyte complexes based on chitosan and poly(methacrylic acid), PMAA, were obtained by the dropping method and template polymerization. The effect of molecular weight of PMAA and ionic strength on the formation of chitosan/poly(methacrylic acid), CS/PMAA, complexes was evaluated using the dropping method. The increase in molec
Publicado em: 2007
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29. 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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30. Spheres of gum of the cajueiro and quitosana for release of fÃrmacos / Esferas de goma do cajueiro e quitosana para liberaÃÃo de fÃrmacos
Cashew gum based beads were produced through interpenetrating polymer networks and polyelectrolyte complexation techniques. Beads of chitosan (CH) and cashew gum (CG)/CH were further crosslinked with genipin obtained from âgenipapoâ fruits. This crosslinking agent was characterized by proton and carbon nuclear magnetic resonance and infrared spectroscopy.
Publicado em: 2007
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31. 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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32. Synthesis and characterization of copper hexacyanoferate nanoparticles and its application in Glucose Biosensor and electrochromics electrodes / Síntese e caracterização de nanopartículas de hexacianoferrato de cobre e sua aplicação em biossensores de glicose e eletrodos eletrocrômicos
In this work, the sonochemical synthesis and the characterization of copper hexacyanoferrate nanoparticles for producing ultra thin films with controlled thickness is reported. Due to its nanometric structure and the excess of superficial negative charges, the proposed immobilization methods were the electrostatic deposition layer by layer (LBL), using the P
Publicado em: 2007
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33. Reuso de agua em industria de reciclagem de embalagens plasticas : aspectos economicos e ambientais em modelo de escala real / Water reuse on plastics recycling pack industry : economical and enviromental aspects in real scale model
The discussion about technical, economical and environmental feasibility of water reuse in industrial process has been a constant concern. This thesis purposes a simplified alternative for waste water treatment seeking reuse in a plastic recycle industry. The water, in this case, is a prime component because it is the main element for the debris and impuriti
Publicado em: 2007
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34. Preparo e caracterização de membranas de quitosana modificadas com poli (ácido acrílico)
The aim of this study was to generate an asymmetric biocompactible and biodegradable chitosan membrane modified by the contact with a poly(acrylic acid) solution at one of its sides at room temperature and 60◦C. The pure chitosan membrane, as well as the ones treated with poly(acrylic acid) were characterized by infrared spectroscopy (FTIRATR) at
Publicado em: 2006
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35. Estudo da orientação molecular em filmes automontados de azopolímeros por meio da técnica de geração de segundo harmônico (SHG) / Molecular orientation in self-assembled azo-polymer thin films studied by second harmonic generation (SHG).
Ultrathin films of polymers containing azochromophores are important for many applications such as optical data storage, formation of surface relief gratings, liquid crystal alignment layers and non-linear optical devices. Among several techniques for fabricating organic thin films, the Layer-By-Layer electrostatic self-assembly (LBL) is very attractive due
Publicado em: 2006
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36. Preparation of spray dried chitosan microspheres with differents kinds of crosslinking agents useful in genic vaccination / Preparação de microesferas de quitosana por spray drying com diferentes tipos de reticulação para uso na vacinação genica
In recent years, chitosan, a natural cationic polysaccharide, has attracted considerable attention as a new non-toxic polymer having favourable characteristics such as biocompatibility, biodegradability and mucoadhesiveness. Chitosan has found several applications as a biomaterial in tissue engineering as well in controlling drug release by various routes of
Publicado em: 2005