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
Distribution Statement : APPROVED FOR PUBLIC RELEASE