Process for the production of a ferromagnetic composition, ferro

Details Process for the production of a ferromagnetic composition, ferro Process for the production of a ferromagnetic composition, ferro

1987-10-26

1990-08-07

Maples, John S.

Compositions

Preservative agents

Anti-corrosion

252309, 252 6256, 252583, 25229901, 2522992, 2522995, 350350R, B01J 1300, C09K 1952

Patent

active

049466232

ABSTRACT:
There is provided a process for the production of a composition and, in particular, of a ferromagnetic liquid crystal. The process comprises (1) forming a micro-emulsion by dispersing an aqueous solution containing ferrous cations and ferric cations in an oil in the presence of a surfactant and a co-surfactant such that the aqueous solution becomes a liquid phase dispersed in ther oil as a discontinuous liquid phase, and (2) reacting the ferrous cations and ferric cations with a chemical compound to form ferromagnetic particles in situ in the aqueous solution. According to the invention, this process is useful in forming magnetite particles (Fe.sub.3 O.sub.4) from 1 to 100 mm. in size.

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patent: 4234437 (1980-11-01), Friberg
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patent: 4416751 (1983-11-01), Berkowitz et al.
patent: 4599184 (1986-07-01), Nakatani et al.
patent: 4652257 (1987-03-01), Chang
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patent: 4783150 (1988-10-01), Tabony
patent: 4822535 (1989-04-01), Ekman et al.
Derwent Abstract 79-83764B/46 9/3/76.
Gan, L. M.; Chew, C. H.; Friberg, S. E. J. Macro Mol. Sci. Chem., A19 (5), pp. 739-756 (1983).
Molecular Crystals . . . "The Structure of lyotrobicnematic . . . " K. Radley vol. 44, 227, 1978.
Chemical Abstracts "Internal Structure of oil-in-water" . . . Fukushima . . . vol. 101, No. 22, Nov. 26, 1984.

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