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Magnetic Liquid Crystal Composition

IP.com Disclosure Number: IPCOM000073642D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Wheelock, CE: AUTHOR

Abstract

The combination of magnetic material with liquid crystalline material results in compositions which provide a visible optical response to magnetic fields. Compositions of this type are produced by mixing or by chemical reaction.

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Magnetic Liquid Crystal Composition

The combination of magnetic material with liquid crystalline material results in compositions which provide a visible optical response to magnetic fields. Compositions of this type are produced by mixing or by chemical reaction.

Materials of this type are produced, for example, by dispersing magnetic material or magnetic material precursors in a liquid crystalline material. In one embodiment, magnetic material, such as finely divided iron, magnetic iron oxides, cobalt, nickel and others, are dispersed in, or coated with, liquid crystalline materials. In another technique, the salt of a magnetic metal is reacted with a liquid crystalline material, such as a beta-diketo organic compound. For example, ferric chloride is reacted with a liquid crystalline material, such as sodium cholesteryl acetoacetate, under anhydrous conditions. Subsequent removal of nonmagnetic, inorganic by-products, such as sodium chloride, followed by the addition of water produces a magnetic liquid crystalline material, including magnetic iron oxide.

When subjected to a magnetic field, magnetic liquid crystalline material produces an optical response. Magnetic liquid crystalline compositions are utilized to produce optical readout when incorporated in a magnetic recording system or as a magnetic indicator in a fluid logic system.

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