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Stable-emulsion-and-method-for-preparation-thereof

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Stable emulsion and method for preparation thereof

Details

Inventors: Romankiw, Lubomyr T.;
Assignee: IBM (Armonk, NY)
Primary Examiner: Edmundson; F.C.
Assistant Examiner:
Attorney, Agent or Firm: Pollock, Vande Sande & Priddy

An emulsion of water; a water immiscible liquid including a solution of a liquid nonpolar hydrocarbon and a liquid halogenated aliphatic hydrocarbon; and a colloidal suspension of magnetic particles and a surface active agent.

DETAILED DESCRIPTION What is claimed is: 1.
An emulsion having a continuous and discontinuous phase comprising: A.
water; B.
a water-immiscible organic liquid phase comprising a solution of: 1.
a liquid nonpolar hydrocarbon selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, and mixtures thereof; and 2.
a liquid halogenated aliphatic hydrocarbon; C.
a colloidal suspension in the discontinuous or continuous phase of the emulsion of ferromagnetic particles and a surface-active agent in an amount at least sufficient to stabilize the ferromagnetic particles in the desired discontinuous or continuous phase of the emulsion; D.
the relative proportions of said nonpolar hydrocarbon and said halogenated aliphatic hydrocarbon being such that the density of the water phase and the density of the water-immiscible liquid phase are substantially equal to each other; and E.
said nonpolar hydrocarbon and said halogenated aliphatic hydrocarbon being mutually soluble in each other and being compatible with said surface-active agent.
2.
The emulsion of claim 1 which is a water-in-oil emulsion and said magnetic particles are suspended in the water.
3.
The emulsion of claim 1 wherein said magnetic particles are magnetite.
4.
The emulsion of claim 1 wherein said colloidal suspension is an aqueous colloidal suspension having a density between about 1.
05 grams per cc to about 1.
9 grams per cc.
5.
The emulsion of claim 1 wherein said surface-active agent is an ionic surface-active agent.
6.
The emulsion of claim 1 wherein said surface-active agent is an aliphatic carboxylic acid having about 8 to 28 carbon atoms or salt thereof.
7.
The emulsion of claim 1 wherein said surface-active agent is oleic acid or salt thereof.
8.
The emulsion of claim 1 wherein said liquid nonpolar hydrocarbon is selected from the group consisting of kerosene, decahydronaphthalene, heptane, decane, and benzene.
9.
The emulsion of claim 1 wherein said liquid halogenated hydrocarbon is trichloroethylene.
10

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