Preparation and Properties of a Stable Metallic Ferrofluid.
Final technical rept. 1 Oct 73-30 Sep 74,
UNIVERSITY COLL OF NORTH WALES BANGOR SCHOOL OF PHYSICAL AND MOLECULAR SCIENCES
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This work attempts to determine a technique for stabilizing a dispersion of small iron particles in mercury i.e. a ferrofluid. The results relate to the production of the ferrofluids and to the stability of these ferrofluids with and without a tin additive, during aging at 425K. Agglomeration due to magnetic interactions can be reduced at room temperature by producing a ferrofluid containing particles of approximately 12A radius. Two ferrofluids 1.5 emugm and 4.25 emugm are produced by electrodeposition of iron onto a mercury cathode. Agitation of the iron particles by a 700 Oe a.c. inhomogeneous magnetic field is used to prevent agglomeration and help disperse the particles into the mercury. Growth kinetics for iron in mercury are compared with experimental results. Two possible mechanisms for the greater stability of the tin-present ferrofluids are discussed.
- Physical Chemistry
- Miscellaneous Materials
- Electricity and Magnetism