Journal ArticleDOI
Preparation of magnetic ion‐exchange resins by the suspension polymerization of styrene with magnetite
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TLDR
In this paper, magnetic polymer microspheres composed of magnetite, styrene, and divinylbenzene were prepared by suspension polymerization to produce magnetic ion exchange resins (MIEXs).Abstract:
Magnetic polymer microspheres composed of magnetite, styrene, and divinylbenzene were prepared by suspension polymerization to produce magnetic ion-exchange resins (MIEXs). The magnetite was grafted with oleic acid to improve the magnetic properties of the MIEXs and to prevent the magnetite from flushing out of the MIEXs. The shape and magnetic properties of the magnetic microspheres were investigated with scanning electron microscopy and vibrating-sample magnetometry. The average diameter of the prepared magnetic polymer microspheres was about 219 μm. The two types of MIEXs were prepared, magnetic cation-exchange resins (MCEXs) and magnetic anion-exchange resins (MAEXs). MCEX was prepared by sulfonation of magnetic polymer microspheres, and MAEX was made by a quaternization reaction with triethylamine of chloromethylated magnetic polymer microspheres. With diffuse-reflectance Fourier transform infrared spectroscopy, elemental analysis, and acid–base titration, the degree of substitution and ion-exchange capacity of the MIEXs were assessed. The efficiency of each MCEX and MAEX for the purification of contaminated water was examined with Co2+ and NO solutions, respectively. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2058–2067, 2003read more
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Superparamagnetic Colloids: Controlled Synthesis and Niche Applications**
TL;DR: A comprehensive review of superparamagnetic colloid research can be found in this article, with a focus on those systems that can be prepared as monodisperse samples and in relatively large quantities.
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Removal of Cu2+ from aqueous solution by chitosan-coated magnetic nanoparticles modified with α-ketoglutaric acid
TL;DR: The high stability and recovery capacity of the chitosan-coated magnetic nanoparticles modified with alpha-ketoglutaric acid (alpha-KA-CCMNPs) suggest that these novel magnetic nanoadsorbents have potential applications for removing Cu(2+) from wastewater.
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Silica coated magnetite particles for magnetic removal of Hg2+ from water.
Penka I. Girginova,Ana L. Daniel-da-Silva,Cláudia B. Lopes,Paula Figueira,Marta Otero,Vitor S. Amaral,Eduarda Pereira,Tito Trindade +7 more
TL;DR: Under the experimental conditions used, the materials reported here displayed high efficiency for Hg(2+) uptake (74%) even at contaminant levels as low as 50 μg l(-1), therefore these eco-nanomagnets show great potential for the removal of heavy metal ions of polluted water, via magnetic separation.
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Synthesis and characterization of micron-sized monodisperse superparamagnetic polymer particles with amino groups
TL;DR: In this paper, a set of magnetic polyglycidyl methacrylate (PGMA) particles with functional amino groups were prepared by a process involving: (1) preparation of parent monodisperse PGMA particles by dispersion polymerization method, (2) chemical modification of the PGMA particle with ethylenediamine (EDA) to yield amino groups, and (3) impregnation of iron ions (Fe2+ and Fe3+) inside the particles and subsequently precipitating them with ammonium hydroxide to form magnetite (
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Tailored functionalization of iron oxide nanoparticles for MRI, drug delivery, magnetic separation and immobilization of biosubstances.
TL;DR: Tuning the surface chemistry and design of magnetic nanoparticles are described in relation to their applicability in advanced medical technologies and biotechnologies including magnetic resonance imaging (MRI) contrast agents, targeted drug delivery, magnetic separations and immobilizations of proteins, enzymes, antibodies, targeting agents and other biosubstances.
References
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Journal ArticleDOI
Functional polymer microspheres
TL;DR: In this paper, examples of the above-mentioned functional particles are reviewed and discussed, including absorbents, latex diagnostics, affinity bioseparators and drug and enzyme carriers.
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Hydrophilic magnetic polymer latexes. 1. Adsorption of magnetic iron oxide nanoparticles onto various cationic latexes
TL;DR: In this article, the adsorption of iron oxide nanoparticles onto the three types of polymer latexes via electrostatic interaction was studied as a function of the iron oxide particle concentration, charge density and the cross-linking density of the hydrophilic layer.
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Magnetic ion-exchange nano- and microparticles for medical, biochemical and molecular biological applications
TL;DR: In this article, a new group of novel magnetic nano-and microparticles consisting of diverse synthetic and natural matrices such as polyvinyl alcohol, polyacrylates and polysaccharide derivatives as well as starch, pectine and alginates, were synthesized.
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Convenient preparation methods for magnetic colloids
TL;DR: In this article, the authors present convenient laboratory-scale preparation methods for Maghemite grafted with fatty acids as well as maghemite-silica core-shell colloids.
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Resolving the Puzzle of Ferrofluid Dispersants
TL;DR: In this article, the forces between layers of oleic-like surfactants and stearic acid-like ones across a hexadecane (HD) medium were measured using a surface force balance (SFB).