Preparation and Properties of a Stable Metallic Ferrofluid.
Annual technical rept. Oct 74-Oct 75,
UNIVERSITY COLL OF NORTH WALES BANGOR SCHOOL OF PHYSICAL AND MOLECULAR SCIENCES
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Results are presented in this report on the long term stability of metallic ferromagnetic liquids containing iron particles in mercury. The effect of various coatings is considered. In particular a tin coating is found to enhance the stability in the long term. A different method to introduce stability by controlling the contact potential between particle and fluid by the addition of sodium is described and shown to improve the stability to a point where the long term growth is negligible the maximum radius being 40-45A. This is a very important development and leads to the possible uses of these fluids in devices such as magnetic seals and energy conversion systems.
- Physical Chemistry
- Miscellaneous Materials