Magnetic Polymeric Particles
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Trypanocidal Activity and Increased Solubility of Benznidazole Incorporated in PEG 4000 and Its Derivatives
Selecting a polymer depends on its characteristics, the properties of the drug and of the remaining ingredients in the formulation. The drug, when incorporated into a polymeric matrix, can show several advantages when compared with its conventional form. In this context, this work describes the preparation and characterization of polyethylene glycol (PEG 400
J. Braz. Chem. Soc.. Publicado em: 2021-06
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2. Factorial design to obtain magnetized poly(ethyl acrylate-co-divinylbenzene)
Abstract Magnetized polymers are produced by incorporating magnetic particles in a polymeric matrix. This article describes the use of the suspension polymerization technique using ethyl acrylate and divinylbenzene as monomers, in the presence of heptane and/or toluene as diluent, initiated by free radicals. To produce the polymer, we first performed fractio
Polímeros. Publicado em: 04/07/2019
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3. Polydimethylsiloxane as a Matrix for the Stabilization and Immobilization of Zero-Valent Iron Nanoparticles. Applications to Dehalogenation of Environmentally Deleterious Molecules
A wet-synthetic method is described to obtain magnetic, air-stable, zero-valent iron nanoparticles coated with an alkanedioic acid. The particles can be immobilized in an amino-substituted polysiloxane matrix to provide materials capable of dechlorinating, debrominating, and deiodinating a wide variety of halogenated organic molecules dissolved initially in
J. Braz. Chem. Soc.. Publicado em: 2018-07
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4. Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers
Abstract This work describes the synthesis and applications of amphiphilic polystyrene-block-poly(N-vinyl-2-pyrrolidone) (PS-b-PVP) copolymers as a silver and silica nanoparticle surface modification agent. The synthesis of PS-b-PVP was carried out using controlled/living radical polymerization techniques. The synthesis of the block copolymers was confirmed
Polímeros. Publicado em: 15/03/2016
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5. Removal of Phenol from aqueous solutions by Polymeric composites containing Ni and Co particles
Magnetic composites have a wide range of potential technological applications; however the evaluation of this material for extraction of phenolic compounds has not been sufficiently studied. Due to its high toxicity and solubility the removal of phenolic compounds from the aquatic environments has critical importance. In this work polymeric composites were p
Polímeros. Publicado em: 25/10/2013
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6. Ferritas de cobre e zinco do tipo espinélio sintetizadas pelos métodos: hidrotermal assistido por micro-ondas, precursores poliméricos, reação no estado sólido e decomposição térmica / Spinel type copper and zinc ferrites synthesized by the methods: microwave assisted hydrothermal, polymeric precursor, solid state reaction and thermal decomposition.
Ferrites are well studied materials due to their wide application as: gas detector, optical, electronic and magnetic devices, catalyst and pigments. In the synthesis of materials, the properties are extremely influenced by the synthesis method. In this work, four methods were used in the synthesis of spinel ferrites with composition Zn1-xCuxFe2O4 (x = 0,0; 0
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/05/2012
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7. Desenvolvimento de uma formulação cólon específica visando o tratamento da colite ulcerativa
Micro and nanoparticulate systems as drug delivery carriers have achieved successful therapeutic use by enhancing efficacy and reducing toxicity of potent drugs. The improvement of pharmaceutical grade polymers has allowed the development of such therapeutic systems. Microencapsulation is a process in which very thin coatings of inert natural or synthetic po
Publicado em: 2009
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8. Encapsulação de nanopartículas de magnetita em matriz de poli(metacrilato de metilacoácido metacrílico) por processo de polimerização em miniemulsão
Partículas magnéticas são sistemas com potencial de uso em liberação controlada fármacos, ferrofluidos e tratamentos de efluentes. Em muitas situações, como em aplicações biológicas, é necessário revestir as partículas magnéticas com um material orgânico, como polímeros. Neste trabalho, partículas magnéticas foram obtidas pelo revestimento
Publicado em: 2007
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9. Magnetic resonance study of polymeric composites and fluoroindate glasses. / Estudo de compósitos poliméricos e vidros fluoroindatos por ressonância magnética.
Polymeric composites and fluoroindate glasses were studied using pulsed Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies. Study of the composite formed by the polymer poly-ethylene oxide and carbon particles allowed us to distinguish the mobilities of polimeric chains and to identify the contributions from different p
Publicado em: 1999
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10. Reações interfaciais de Poli(dimetilsiloxano)s com superficies hidroxiladas
Polysiloxanes, commonly know as silicones, are polymers formed by an Si-O backbone containing organic groups attached to the silicon atoms. Their chemistry is basically determined by the polarization of the Si-O bonds, and by the structure of the pendant organic groups. The Si-O bond is highly resistant to homolytic cleavage, but is susceptible to heterolyti
Publicado em: 1997