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2006-4-24 Nanoparticles. Magnetic materials. ABSTRACT. Nanoparticlesof Fe, Co, FeCo, SmCo, and NdFeB systems with sizes smaller than 30nmand narrow size distribution have been successfully prepared by ball millingin the presence of surfactantsand
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2013-4-8 One of the approaches for preparation of magnetic nano-particles is by surfactant-assisted ball milling, a techniqueused for making magnetic fluids.1–3Surfactants aid inachieving smaller particle sizes during milling and dispersingused.4–6the fine particles when appropriate solvents are However, the size distribution of the particles obtained byball milling can be quite wide compared with the
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2006-4-24 Nanoparticles of Fe, Co, FeCo, SmCo, and NdFeB systems with sizes smaller than 30 nm and narrow size distribution have been successfully prepared by
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2006-4-1 Magnetic nanoparticles produced by surfactant-assisted ball milling. Nanoparticles of Fe, Co, FeCo, SmCo, and NdFeB systems with sizes smaller than 30 nm and narrow size distribution have been successfully prepared by ball milling in the presence of surfactants and organic carrier liquid.
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2007-10-12 The described surfactant-assisted ball milling and size-selection processes are promising for fabrication of nanoparticles of other rare-earth-containing magnetic materials (e.g., Nd 2 Fe 14 B nanoparticles) and can be developed to be a versatile technique of nanoparticle preparation for other materials in general.
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2013-4-8 Hard magnetic nanoparticles based on the Sm2Co17and SmCo5systemshave been successfully produced using a surfactant-assisted ball millingtechnique. A size-selection process has been developed to obtainnanoparticles of different sizes with narrow size distribution. Significantroom-temperature coercivity up to 3.1 kOe has been achieved with theSm2Co17-based nanoparticles of an average size of 23 nm. It has been foundthat surfactants
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2012-5-1 This study demonstrated that magnetite nanoparticles can be prepared using a simple surfactant-free electrochemical method. The magnetite nanoparticles produced are nearly spherical and are uniform in size, with mean sizes ranging from about 10 to 30 nm depending on the experimental conditions. Although there are some impurities in the form of FeOOH, which is a non-magnetic material, the nanoparticles
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2019-5-25 The purpose of this study is to investigate the possible influence of the different surfactants on the structure and therefore on the magnetic properties of the iron oxide nanoparticles. Thus, different techniques were employed in order to elucidate the composition and structure of the magnetic iron oxide nanoparticles.
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2020-12-1 Surfactant-assisted metallic nanoparticle production has enabled the realization of colorimetric sensors, which are of massive interest in numerous interdisciplinary applications owing to their simplicity, practical applicability, cost-effective production, high stability, and high selectivity.
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2013-4-8 Hard magnetic nanoparticles based on the Sm2Co17 and SmCo5 systems have been successfully produced using a surfactant-assisted ball milling technique. A size-selection process has been developed to obtain nanoparticles of different sizes with narrow size distribution. Significant room-temperature coercivity up to 3.1 kOe has been achieved with the
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Hard magnetic nanoparticles based on the Sm 2 Co 17 and SmCo 5 systems have been successfully produced using a surfactant-assisted ball milling technique. A size-selection process has been developed to obtain nanoparticles of different
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2020-9-10 Fe3O4 magnetic nanoparticles have been synthesized successfully in chemical co-precipitation method and coated with oleic and citric acids, separately. The crystalline sizes are determined by the Debye-Scherer equation with X-ray powder diffraction data. As a result, the mean crystalline size and lattice constant of Fe3O4 nanoparticles respectively increases from ~11 to ~13.8
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2012-5-1 The magnetite nanoparticles produced are nearly spherical and are uniform in size, with mean sizes ranging from about 10 to 30 nm depending on the experimental conditions. Although there are some impurities in the form of FeOOH, which is a non-magnetic material, the nanoparticles still exhibit ferromagnetic behavior with a relatively high ...
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2020-12-1 Surfactant-dependent size modification has also been demonstrated for ZnS nanoparticles, where particle diameters of 55.5 ± 0.5, 13.4 ± 0.5, and 11.6 ± 0.5 nm were obtained using different surfactants, namely DTAB, TTAB, and CTAB, respectively, where the formation of smaller nanoparticles was triggered by the hydrophobicity of the surfactant ...
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2011-4-2 Chemical synthesis of magnetic nanoparticles ... The surfactant coating on magnetic nanoparticles prevents clustering due to steric repul-sion. Dynamic adsorption and desorption of surfactant mole- ... 7–11 nm sized nanoparticles were produced. A further narrow-ing of particle size distribution was proceeded using a size
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2012-2-21 Stable magnetic nanoparticle dispersions with narrow size distribution were thus produced. The microemulsion seed copolymerization of methacrylic acid, hydroxyethyl methacrylate, and cross-linker resulted in a stable hydrophilic polymeric shell around the nanoparticles. ... Changing the monomer concentration and water/surfactant ratio controls ...
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2021-3-12 Aqueous magnetic fluids were synthesized by a sequential process involving the chemical coprecipitation of Fe(II) and Fe(III) salts with ammonium hydroxide (NH4OH) followed by resuspension of the ultrafine particles in water using fatty acids. This procedure produced Fe3O4 nanoparticles stabilized against agglomeration by bilayers of n-alkanoic acids with 9−13 carbons encapsulating the metal ...
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2016-7-26 The addition of superparamagnetic iron nanoparticles into polystyrene matrix allows for the modification of the physical properties as well as the implementation of new features in the hybrid nanomaterials. These materials have excellent potential for biomedical and bioengineering applications. Nevertheless, it is necessary to achieve a good dispersion of magnetic nanoparticles for its ...
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2021-6-9 Surfactant-coated nanoparticles have been widely used in the field of food nanotechnology. Recent progress of surfactant-coated nanoparticles in this field is summarized in Table 2. Surfactant-coated organic and inorganic nanoparticles in food nanotechnology will be discussed separately in the following sections.
Read More2013-4-8 Hard magnetic nanoparticles based on the Sm2Co17 and SmCo5 systems have been successfully produced using a surfactant-assisted ball milling technique. A size-selection process has been developed to obtain nanoparticles of different sizes with narrow size distribution. Significant room-temperature coercivity up to 3.1 kOe has been achieved with the
Read MoreHard magnetic nanoparticles based on the Sm 2 Co 17 and SmCo 5 systems have been successfully produced using a surfactant-assisted ball milling technique. A size-selection process has been developed to obtain nanoparticles of different
Read More2019-9-30 Magnetic hysteresis loops and TEM images (insets) of nanoparticles synthesized by using (S1) 1.5, (S2) 2.5, (S3) 3.5, and (S4) 4.5 mmol of each surfactant after the annealing at 650–C for 1 hour. tially different in size, the effect of surfactant concentration on the composition is not marked. The Pt M5-edge and Fe K-edge XANES spectra of the
Read More2011-4-2 Chemical synthesis of magnetic nanoparticles ... The surfactant coating on magnetic nanoparticles prevents clustering due to steric repul-sion. Dynamic adsorption and desorption of surfactant mole- ... 7–11 nm sized nanoparticles were produced. A further narrow-ing of particle size distribution was proceeded using a size
Read More2012-2-21 Stable magnetic nanoparticle dispersions with narrow size distribution were thus produced. The microemulsion seed copolymerization of methacrylic acid, hydroxyethyl methacrylate, and cross-linker resulted in a stable hydrophilic polymeric shell around the nanoparticles. ... Changing the monomer concentration and water/surfactant ratio controls ...
Read More2021-3-12 Aqueous magnetic fluids were synthesized by a sequential process involving the chemical coprecipitation of Fe(II) and Fe(III) salts with ammonium hydroxide (NH4OH) followed by resuspension of the ultrafine particles in water using fatty acids. This procedure produced Fe3O4 nanoparticles stabilized against agglomeration by bilayers of n-alkanoic acids with 9−13 carbons encapsulating the metal ...
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The study of size and surface effects in rare earth transition metal nanoparticles is scientifically very important. In this work our studies were focused on NdCo 5 which is interesting because of its complex magnetic ordering behavior at different temperatures. Anisotropic NdCo 5 nanoparticles have been produced by surfactant-assisted high-energy ball milling (HEBM) of nanocrystalline ...
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2012-1-2 2.3 Preparation of polymer coated magnetic nanoparticles Previously produced iron oxide nanoparticles were coated with polymer. It was achieved by emulsion polymerization at a high surfactant to monomer ratio as described by Sayar et al. [13]. MMA and AAc were used as comonomers with a weight ratio of 9/1.
Read Morethe significance of the surfactant presence on the final size, size distribution and morphology in nanoparticles obtained by chemical routes. In this work, we have synthesized iron oxide nanoparticles by a chemical route and we have studied the effect of surfactant/precursor ratio on the final particle size.
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2009-10-27 The size and uniformity of magnetic nanoparticles developed from a Group of Uniform Materials Based on Organic Salts (GUMBOS) were controlled using an in situ ion exchange, water-in-oil (w/o) microemulsion preparation. Most of these nanoGUMBOS are in fact ionic liquids (i.e., melting points less than 100 °C), while others have melting points above the conventional 100 °C demarcation.
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