Magnetic properties of submicrometer-sized nickel particles prepared by a low-temperature nonaqueous reductive technique employing polyols (abstract) : 35th annual conference on magnetism and magnetic materials
Nanna, L. C. ; Bush, R. L. ; Arajs, S. ; Rasmussen, D. H. ; Skodzinsky, M. J.
[S.l.] : American Institute of Physics (AIP)
Published 1991
[S.l.] : American Institute of Physics (AIP)
Published 1991
| ISSN: |
1089-7550
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
A simple method of producing small nickel particles (〈1 μm) of narrow size distribution has been explored. The particles have been formed by stirring and heating (with reflux) a solution of nickel(II) chloride hexahydrate, sodium hydroxide, and a polyol (ethylene, tetraethylene, or polyethylene glycol) both in the presence and absence of an added surface active compound (polyvinylpyrrolidone). The polyol functions as a nonaqueous solvent and ultimately as a reducing agent through its thermal decomposition, reducing the nickel hydroxide suspension precipitated from the nickel(II) chloride hexahydrate with sodium hydroxide in solution. Sodium hydroxide serves also to catalyze the reductive reaction. Chief parameters influencing the mean size, distribution of sizes, and morphology of particles produced by this method are temperature of the reaction, selection of the solvent/reducing agent, concentration of the added surfactant, and concentrations of the reactants. The particles have been examined by scanning and transmission electron microscopies and x-ray diffraction. Magnetic measurements have been performed at room temperature in a vibrating sample magnetometer. Special consideration has been given to the coercivity and reduced remanence.
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| Type of Medium: |
Electronic Resource
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| URL: |