Observation of aggregates in magnetic particle lacquers

Author

Scholten, P.C. ; Felius, J.A.P. ; Slob, C.

Author_Institution

Philips Res. Lab., Eindhoven, Netherlands

Volume

26

Issue

1

fYear

1990

fDate

1/1/1990 12:00:00 AM

Firstpage

72

Lastpage

74

Abstract

A method for preparing samples of magnetic lacquers for transmission electron microscopy is described. The samples contain only the permanent aggregates present in a suspension, and not the temporary agglomerates that are easily broken up when the suspension is sheared. The method is based on a dilution of the material studied with other magnetic particles that are dissolved after a thin film of the mixed suspension is deposited on a carbon substrate film. Using this method, it is shown that most of the chromium dioxide in a well-dispersed lacquer occurs in parallel aggregates of 2-10 particles that were never separated. The formation of new, lasting aggregates in the lacquer was found to take place in the course of days

Keywords

aggregation in substances; chromium compounds; disperse systems; magnetic fluids; magnetic properties of fine particles; specimen preparation; transmission electron microscope examination of materials; C substrate film; CrO₂ particle lacquers; CrO₂ particle suspension; aggregates; magnetic particle lacquers; mixed suspension; sample preparation method; transmission electron microscopy; Aggregates; Lacquers; Magnetic films; Magnetic force microscopy; Magnetic levitation; Magnetic materials; Magnetic particles; Magnetic separation; Organic materials; Transmission electron microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.50494

Filename

50494