Accession Number : ADA018858

Title :   Preparation and Properties of a Stable Metallic Ferrofluid.

Descriptive Note : Annual technical rept. Oct 74-Oct 75,

Corporate Author : UNIVERSITY COLL OF NORTH WALES BANGOR SCHOOL OF PHYSICAL AND MOLECULAR SCIENCES

Personal Author(s) : Windle,P. L. ; Popperwell,J. ; Charles,S. W.

Report Date : SEP 1975

Pagination or Media Count : 25

Abstract : 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.

Descriptors :   *Ferromagnetic materials, *Colloids, Coatings, Particles, Tin, Iron, Mercury, Fluid flow, Seals(Stoppers), Additives, Sodium, Stability, Energy conversion, Great Britain

Subject Categories : Physical Chemistry
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE