Measurement of hindered settling in magnetic dispersions

Author

Mercer, Tim ; Bissell, Philip R. ; Gilson, Ray G.

Author_Institution

Centre for Mater. Sci., Univ. of Central Lancashire, Preston, UK

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

3219

Lastpage

3221

Abstract

The measurement of hindered settling in a γ-Fe₂O₃ recording media dispersion has been carried out using a scanning column magnetometry technique. From subsequent analysis, a high trapped-liquid estimate (of ∼84% by volume of the settling unit) within the suspension structures was found that compares favorably with a previous computer simulation. Correction of hindered settling models to account for the trapped-liquid gave further confidence in the result. In each case, model parameters reduced near-to, or agreed with, those found originally in simple systems that contain little-to-no trapped-liquid.

Keywords

ferrimagnetic materials; iron compounds; magnetic fluids; magnetic particles; magnetic recording; sedimentation; suspensions; γ-Fe₂O₃ recording media dispersion; Fe₂O₃; acicular magnetic particles; computer simulation; high trapped-liquid estimate; hindered settling; magnetic dispersions; magnetic pigment suspension; particulate recording media; scanning column magnetometry; settling unit; suspension structures; trapped-liquid; Atmospheric modeling; Computer simulation; Dispersion; Magnetic analysis; Magnetic flux; Magnetic levitation; Magnetic recording; Magnetostatics; Materials science and technology; Stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802504

Filename

1042503