Particulate Magnetic Recording Media

Speliotis, D.

doi:10.1007/978-94-011-5478-9_26

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…Ferrofluids define a unique class of ferromagnetic liquids in which an inorganic magnetic solid is homogeneously dispersed in a liquid carrier, thus forming a stable colloidal dispersion that exhibits magnetic response when a magnetic field is applied . The availability of magnetic fluids constitutes a topic of interest not only to colloid chemists − but also to the observation of a number of novel phenomena and applications, including magnetocaloric power cycle, magnetoviscous effect, magnetic imaging, magnetic and magneto-optic data storage media, biology and medicine, formation of mono- or multilayered magnetic films, and others.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Capped Ultrafine γ-Fe₂O₃Particles from Iron(III) Hydroxide Caprylate: A Novel Starting Material for Readily Attainable Organosols

2002

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The synthesis of capped γ-Fe 2 O 3 ultrafine particles from thermal treatment of iron(III) hydroxide caprylate in boiling tetraline with retention of the integrity of the caprylate units during the reaction process is reported. This novel material due to the organophilic mantle around the particle surfaces can be easily dissolved in organic solvents and thus the availability of stable magnetic organosols is straightforward. The formation of capped magnetic particles is accomplished only under anaerobic conditions, while the state of hydration of the starting iron(III) hydroxide caprylate precursor was found to play a critical role for the magnetic-phase formation. The various steps in the synthesis as well as the nature of the magnetic particles were studied by means of X-ray powder diffraction and IR and Mo ¨ssbauer spectroscopies, while the morphology and particle size of the final magnetic nanocrystallites were evaluated by the TEM technique. Finally, ESR spectroscopy provided strong evidence for the isolated state of the magnetic particles in their solvated state.

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