• DocumentCode
    766118
  • Title

    Preparation and Properties of Colloidal Ferromagnetic Metals

  • Author

    Nakatani, I. ; Furubayashi, T.

  • Author_Institution
    National Research Institute for Metals, Electrical Communication Lab., NTT.
  • Volume
    1
  • Issue
    6
  • fYear
    1985
  • Firstpage
    769
  • Lastpage
    771
  • Abstract
    Preparation of Co and Fe ferromagnetic colloids using a mixture of oil-soluble surfactants and a saturated hydrocarbon oil is described. Amines with long-chain lipophilic alkyl radicals and sulfonates were used as the surfactants, and a drum was rotated to draw the liquid into a film while evaporating the metal in vacuum, gradually increasing the colloid concentration in the liquid. Monodisperse colloidal particles of uniform size (about 50 Å) were obtained. Co colloids formed in this way were super-paramagnetic at 246 K and above, and the colloidal particle concentration was 6 × 1016 to 2 × 1017. The temperature of transition to ferromagnetism varied with the surfactant used.
  • Keywords
    Adhesives; Atomic measurements; Electrons; Hydrocarbons; Iron; Magnetic liquids; Magnetics Society; Petroleum; Saturation magnetization; Temperature;
  • fLanguage
    English
  • Journal_Title
    Magnetics in Japan, IEEE Translation Journal on
  • Publisher
    ieee
  • ISSN
    0882-4959
  • Type

    jour

  • DOI
    10.1109/TJMJ.1985.4548947
  • Filename
    4548947
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=766118