Magnetic Properties of Electrophoretic Deposited Ferrite Particulate Films

Hashi, S.; Tokunaga, Yuya; Yanase, Shunji; Okazaki, Y.; Sakurada, Osamu; Nishimura, Kiyoshi; Inoue, M.

doi:10.1109/tmag.2004.832508

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…Frequently, the preparation of stable suspensions is also a prerequisite for materials such as magnetic nanocomposites and magnetic coatings. For example, magnetic nanocomposites containing magnetic nanoparticles homogeneously dispersed in various solid matrixes, such as silica [7,8] or different polymers [9,10], were prepared using a ferrofluid as the precursor, and magnetic coatings can be deposited from suspensions of magnetic nanoparticles using electrophoretic deposition [11,12].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of ultrafine barium hexaferrite nanoparticles and the preparation of their stable suspensions

et al. 2009

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The hydrothermal treatment of an appropriate suspension of Ba and Fe hydroxides in the presence of a large excess of OH(-) results in the formation of Ba hexaferrite at temperatures as low as 150 degrees C. This low formation temperature enables the synthesis of uniform, ultrafine Ba hexaferrite nanoparticles. These nanoparticles have a disc-like shape, approximately 10 nm wide, but only approximately 3 nm thick. When the temperature of the hydrothermal treatment is increased, large platelet Ba hexaferrite crystals appear as a consequence of secondary re-crystallization (Ostwald ripening). In this work, this undesired process of secondary re-crystallization has been evaluated. We show that the secondary re-crystallization can be totally suppressed with the use of an oleic acid surfactant. The addition of oleic acid enabled the synthesis of uniform, ultrafine nanoparticles at temperatures up to 240 degrees C. The nanoparticles were hydrophobic and could be suspended in nonpolar liquids to form relatively concentrated ferrofluids. Such stable suspensions of hexaferrite nanoparticles will be technologically important, especially as precursors for the preparation of new nanostructured materials, for example nanocomposites or nanostructured ceramic films.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of ultrafine barium hexaferrite nanoparticles and the preparation of their stable suspensions

et al. 2009

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“…Typically, thick magnetic films are prepared with screen printing, spray coating, and tape casting [12][13][14]. Only a few examples of thick films based on spinel ferrites being prepared with EPD have been reported [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Barium hexaferrite suspensions for electrophoretic deposition

Ovtar

Lisjak

Drofenik

2009

Journal of Colloid and Interface Science

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“…For example, the transport of pollutants and microbes in groundwaters, selective flocculation, dewatering of suspensions, wafer cleaning in semiconductor manufacturing, and so on, are processes involving aggregation between particles of different natures [3]. In particular, if one of the types of particles involved is magnetic, as is the case in the present work, new applications can be thought of, not only in the field of water treatment technology [4], but also in the preparation of ferrite films for magnetic tapes or hard drives [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Stability of mixtures of charged silica, silica–alumina, and magnetite colloids

Viota

Raşa

Sacanna

et al. 2005

Journal of Colloid and Interface Science

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We report experiments on the stability of aqueous mixtures of charged colloidal magnetite and charged silica and silica covered with alumina particles of similar size. First, positively charged magnetite dispersions were mixed with negatively charged silica dispersions at pH 4, at different volume ratios and low colloid volume fractions, producing mixtures which were stable over a period of weeks despite the expected electrostatic attraction between the oppositely charged particles. When magnetite particles were mixed with positively charged silica covered with alumina at pH 4 under exactly the same conditions, some of the systems separated to form a magnetite sediment. When the volume fraction of the initial dispersions was increased, the behavior of the mixtures was the opposite: positive magnetite/negative silica mixtures were unstable at intermediate volume ratios. The unexpected behavior of the mixtures was investigated by means of electrophoretic mobility, initial susceptibility, and dynamic light scattering measurements as well as sedimentation experiments.  2005 Elsevier Inc. All rights reserved.

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Magnetic Properties of Electrophoretic Deposited Ferrite Particulate Films

Cited by 9 publications

References 2 publications

Hydrothermal synthesis of ultrafine barium hexaferrite nanoparticles and the preparation of their stable suspensions

Hydrothermal synthesis of ultrafine barium hexaferrite nanoparticles and the preparation of their stable suspensions

Barium hexaferrite suspensions for electrophoretic deposition

Stability of mixtures of charged silica, silica–alumina, and magnetite colloids

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