Ferrofluid
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. SYNTHESIS AND NUCLEAR MAGNETIC RELAXATION PROPERTIES OF COMPOSITE IRON OXIDE NANOPARTICLES
Superparamagnetic iron oxide nanoparticles are suitable contrast agents for magnetic resonance imaging due to their effect on proton relaxation times, and excellent biocompatibility and biodistribution in tissue. In the present study, a ferrofluid formed by dextran-coated iron oxide nanoparticles was prepared by the coprecipitation method and with subsequent
Quím. Nova. Publicado em: 2019-01
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2. Therapeutic mechanism of treating SMMC-7721 liver cancer cells with magnetic fluid hyperthermia using Fe2O3 nanoparticles
This study aimed to investigate the therapeutic mechanism of treating SMMC-7721 liver cancer cells with magnetic fluid hyperthermia (MFH) using Fe2O3 nanoparticles. Hepatocarcinoma SMMC-7721 cells cultured in vitro were treated with ferrofluid containing Fe2O3 nanoparticles and irradiated with an alternating radio frequency magnetic field. The influence of t
Braz J Med Biol Res. Publicado em: 29/08/2014
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3. Gravitational and magnetic separation in self-assembled clay-ferrofluid nanocomposites
We report on experimental observations of self-assemblies in colloidal dispersions of clay nanoplatelets and magnetic nanoparticles. Visual observations have been combined with small angle X-ray scattering (SAXS) in the study of several composites at a fixed clay concentration in the dilute regime, and varying ferrofluid concentrations. Our visual observatio
Brazilian Journal of Physics. Publicado em: 2009-04
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4. Thermogravimetric and magneticproperties of Ni1-X Zn xFe2O4 nanoparticles synthesized by coprecipitation
Ni1-xZn xFe2O4 (x = 0 to 1) nanoparticles of size less than 9 nm were prepared by a chemical coprecipitation method which could be used for ferrofluid preparation. XRD, VSM and DTA-TG (STA) were used to study the effect of variation in Zn substitution and its influence on particle size, magnetic properties such as M S, H C and Curie temperature, as well as o
Materials Research. Publicado em: 2009
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5. Estrutura e propriedades de nanopartículas preparadas via sol-gel / Structure and properties of nanoparticles prepared by sol-gel
Este trabalho propõe a síntese de vários materiais nanoestruturados pelo processo sol-gel. Foram preparados sóis a base de óxido de cério, hidroxiapatita e magnetita. Filmes a base de paládio metálico foram obtidos pela técnica de decomposição térmica e redução em atmosfera de nitrogênio. A caracterização estrutural dos materiais preparados
Publicado em: 2009
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6. Mecânica de suspensões magnéticas diluídas
This work concerns with an investigation of the dynamics of dilute suspensions composed by magnetic particles, considering microstructural and macroscopic aspects of this particulate systems. From the microstructure, it is known that magnetostatic attraction may lead to formation of aggregates in magnetic suspensions. In this way, numerical simulations have
Publicado em: 2009
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7. Study of the ferrofluid drying process for morphological and nanostructutal characterization
A drying method suitable for the study of the morphological and structural properties of colloidal magnetic systems, including a contrast agent used in Magnetic Resonance Imaging (MRI) is described. We tested three alternative ferrofluid drying methods: drying at 70 70ºCC in nitrogen atmosphere; drying in air at 70 70ºCC; and drying by liophylization using
Brazilian Journal of Physics. Publicado em: 2007-12
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8. "Caracterização estrutural e óptica de elastômeros dopados com ferrofluidos" / Optical and Structural Characterization of Elastomers Dopeds with Ferrofluids
This work aims the structural, mechanical and optical characterization of urethane/urea elastomers (PU/PBDO), based on polypropylene oxide and polybutadiene diol, pure, after swelling in toluene and doped with ferrofluid. The ratios in weight % of PU and PBDO used are 40/60, 50/50, 60/40 and 80/20. The structural analysis were made through of polarized light
Publicado em: 2007
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9. Estudo de propriedades não-lineares de colóides magnéticos nas escalas de tempo de mili e femtossegundos / Study of Nonlinear Properties of Magnetic Colloids in the Milli- and Femtosecond Time Scales.
Neste trabalho, estudamos alguns colóides magnéticos dos tipos iônico e surfactado com partículas de estrutura tipo espinélio. Usamos a técnica de varredura-Z para investigar as amostras nas escalas de tempo de femtossegundos e milissegundos. Medimos o índice de refração não-linear nas duas escalas de tempo. Na escala de milissegundos todas as amos
Publicado em: 2007
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10. Ferrofluidos em cÃlulas de Hele-Shaw de espaÃamento variÃvel: o papel do campo magnÃtico e dos estresses viscosos
Neste trabalho de dissertaÃÃo, exploramos analiticamente o fluxo de um ferrofluido newtoniano confinado entre duas placas planas e paralelas. Analisamos o desenvolvimento de instabilidades de interface quando a placa superior à levantada, sob a aÃÃo de um campo magnÃtico aplicado. Obtivemos uma equaÃÃo diferencial de modos acoplados para o sistema, c
Publicado em: 2007
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11. Computer simulation of the stochastic dynamics of super-paramagnetic particles in ferrofluids
Several papers have been written on the complex problem of the stochastic dynamics of the magnetic moments of super-paramagnetic particles, simultaneously with the stochastic rotation of these colloidal particles in a ferrofluid [1-3]. None of these works, however, is sufficiently general and conveniently simple and clear to be used in sumulational works to
Brazilian Journal of Physics. Publicado em: 2006-09
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12. Optical, magnetic and dielectric properties of non-liquid crystalline elastomers doped with magnetic colloids
Magnetic nanoparticles from magnetic colloidal suspensions were incorporated in the urethane/urea elastomer (PU/PBDO) by swelling fully crosslinked elastomer samples with a toluene and ferrofluid mixture. It is shown that ferrofluid grains can be efficiently incorporated into the matrix of elastomers. The dependence of the birefringence of both the pure and
Brazilian Journal of Physics. Publicado em: 2005-03