Method for making porous magnetic glass and crystal-containing s

Details Method for making porous magnetic glass and crystal-containing s Method for making porous magnetic glass and crystal-containing s

1980-05-09

1983-07-26

Fisher, Richard V.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, C03C 322, C03C 1500

Patent

active

043952712

ABSTRACT:
The present invention provides a method for making porous bodies of magnetic glass and/or crystal-containing materials having magnetic crystals incorporated therein with dimensions less than about 1000A. Preferably, the crystals have dimensions less than 500A such that the porous bodies demonstrate essential superparamagnetic behavior. The method involves preparing a body which, upon heat treatment, will separate into at least two vitreous phases and at least one crystal phase. One of the vitreous phases is etched away leaving a structure remaining which contains said magnetic crystals. When present as fine particles, the porous magnetic bodies are especially suitable for use in biological assays.

REFERENCES:
patent: 2106744 (1938-02-01), Hood et al.
patent: 2472490 (1949-06-01), Plank
patent: 3650721 (1972-03-01), Hammel et al.
patent: 4043821 (1977-08-01), Le Bras
patent: 4124735 (1978-11-01), O'Horo
patent: 4126437 (1978-11-01), O'Horo
patent: 4140645 (1979-02-01), Beall

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