Title :
Observation of aggregates in magnetic particle lacquers
Author :
Scholten, P.C. ; Felius, J.A.P. ; Slob, C.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
1/1/1990 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
