Polyelectrolytes
Mostrando 1-12 de 52 artigos, teses e dissertações.
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1. Dendritic Gold Nanoparticles Towards Transparent and Electroactive Electrodes
Abstract: The combination of UV-visible absorption and electrochemical experiments (spectroelectrochemistry) enables to obtain highly specific spectroscopic information (in situ and operando) from modified surfaces. However, such application can be limited by the self-absorbance, for example, when metallic nanoparticles are present on modified surfaces. Indi
An. Acad. Bras. Ciênc.. Publicado em: 28/11/2019
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2. Insulin-loaded polymeric mucoadhesive nanoparticles: development, characterization and cytotoxicity evaluation
Abstract Mucoadhesive nanoparticles are particularly interesting for delivery through nasal or pulmonary routes, as an approach to overcome the mucociliary clearance. Moreover, these nanoparticles are attractive for peptide and protein delivery, particularly for insulin to treat diabetes, as an alternative to conventional parenteral administration. Thus, chi
Braz. J. Pharm. Sci.. Publicado em: 07/06/2018
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3. Nanostructured Polyelectrolytes Based on SPEEK/TiO2 for Direct Ethanol Fuel Cells (DEFCs)
Proton-conducting hybrid membranes consisting of poly(ether ether ketone) sulfonated (SPEEK) and titanium oxide (TiO2) were prepared using the sol-gel technique for application in direct ethanol fuel cells. The effect from TiO2 incorporation on membrane properties such as ethanol uptake, pervaporation and proton conductivity was investigated. The uptake and
Polímeros. Publicado em: 10/06/2014
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4. Application of cationic hemicelluloses produced from corn husk as polyelectrolytes in sewage treatment
Hemicelluloses were extracted from corn husk and converted into cationic hemicelluloses using 2,3-epoxypropyltrimethylammonium chloride. The degree of substitution was determined as 0.43 from results of elemental analysis. The cationic derivative was also characterized by Fourier transform infrared spectroscopy and Carbon-13 magnetic nuclear ressonance. The
Polímeros. Publicado em: 26/07/2013
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5. Sensores e biossensores baseados em transistores de efeito de campo utilizando filmes automontados nanoestruturados / Sensors and biosensors based on field-effect transistors using nanostructured self-assembled films
Separative extended gate field-effect transistor (SEGFET) device is an alternative to the conventional ion-sensitive field-effect transistor (ISFET). The great advantage of SEGFET refers to its easy processing, i.e., it is limited under only manipulation of the gate electrode, avoiding the conventional microelectronic processes. In this way, ion sensors and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
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6. Fotossensibilizadores nanoestruturados por sistema camada por camada
A busca por materiais que possam ser modificados em nível molecular tem sido o alvo de numerosas pesquisas no mundo. Desta maneira, as técnicas de fabricação de filmes finos se destacam devido à possibilidade de se reduzir custos e melhorar a eficiência de sistemas como, por exemplo, os fotossensíveis. Neste contexto, o objetivo deste trabalho foi a o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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7. Influência dos polieletrólitos na resposta eletroquímica de filmes automontados contendo nanotubos de carbono para aplicação em nanomedicina / Influence the polyelectrolytes on the electrochemical response of layer-by-layer films containing carbon nanotubes for applications in nanomedicine
Carbon Nanotubes (CNTs) are cylindrical carbon nanostructures exhibiting excellent electrical, thermal, optical and mechanical properties. The immobilization of CNTs in nanostructured thin films in conjunction with polymers using the Layer-by-Layer (LbL) technique provides a new alternative for development of nanocomposites to be used as sensors and biosenso
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2011
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8. Partículas e filmes híbridos de polímeros e compostos de amônio quaternário com atividade antimicrobiana / Particles and films hybrid of polymers and quaternary ammonium compounds with antimicrobial activity
Partículas e filmes híbridos de polímeros e compostos de amônio quaternário (CAQ) foram caracterizados quanto a propriedades físicas e atividade contra cepas de Pseudomonas aeruginosa ATCC 27853 e Staphylococcus aureus ATCC 25923. Partículas híbridas foram obtidas a partir de fragmentos de bicamada (BF) de brometo de dioctadecildimetilamônio (DODAB)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/02/2011
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9. Fabricação e caracterização de filmes automontados de PAH/BSA / Fabrication and characterization of LbL films of PAH / BSA
In the last years techniques have been developed for the development of science and technology concerning all science fields, such as physics, chemistry and biology. The study of the protein adsorption processes on the solid surfaces is of great importance in the development of biocompatible materials. The Layer-by-Layer deposition technique, where self-asse
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2010
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10. Oclusão de pares iônicos em espaços interlamelares como ferramenta para formação de híbridos luminescentes baseados em V IND. 2 O IND. 5 e MoO IND. 3 / Interlayer occlusion of ion pairs as tool for the production of V2O5 and MoO3-based luminescent materials
In the first part of this work, novel hybrid materials were developed by insertion of poly(diallymethylammonium chloride) PDDA and poly(allylamine hydrochloride) PAH polyelectrolytes into V2O5 and MoO3 interlayer spaces using hydrothermal treatment. A systematic study of the synthesis of hybrids materials by direct in situ reaction of PDDA and PAH polycation
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2010
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11. Imobilização de polieletrólitos do tipo ionenos em suportes sólidos / Immobilization of Polyelectrolytes of Ionene Types in Solid Supports
Os polissabões são polímeros constituídos de unidades monoméricas anfifílicas. Em meio aquoso, os polissabões formam microdomínios intra- ou inter-poliméricos capazes de mimetizar muitas das propriedades de micelas, como solubilizar moléculas orgânicas, trocar contraíons e catalisar reações químicas. Os polissabões utilizados em nossos estudo
Publicado em: 2009
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12. 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