Porous magnetic glass structure

Details Porous magnetic glass structure Porous magnetic glass structure

1979-04-13

1980-11-11

McCarthy, Helen M.

Compositions

Magnetic

Iron-oxygen compound containing

65 31, 106 396, 106 40V, 106 54, 252 6256, 252 6261, 252 6262, 252 6264, 428402, 428900, C03B 000, C03C 322, C03C 1500, C04B 3526

Patent

active

042331692

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: 2834738 (1958-05-01), Vincent
patent: 3904422 (1975-09-01), Eaton
patent: 4070246 (1978-01-01), Kennedy et al.
patent: 4113915 (1978-09-01), Schott
patent: 4124735 (1978-11-01), O'Horo
Elmer, T. H. "Phase Separation in Borosilicate Glasses as Seen by Electron Microscopy and Scaning Electron Microscopy", J. Am. Cer. Soc. 53 (14) 1970, pp. 171-175.

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