Polymeric stabilization of colloidal magnetite magnetic fluids

Elkafrawy, S., Hoon, Steve R., Lambrick, David B., Bissell, P.R. and Price, C. (1990) Polymeric stabilization of colloidal magnetite magnetic fluids. IEEE transactions on magnetics, 26 (5). pp. 1846-1848. ISSN 0018-9464

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Abstract

Stable colloidal suspensions of ~4.3-nm mean diameter magnetic particles have been prepared employing polystyrene-block-poly(ethylene/propylene) copolymer (Mn ~100000) for steric stabilization. The potential of the copolymers as both dispersants and inhibitors of long-term oxygen degradation of the magnetic properties of the particles has been assessed. Magnetic changes due to oxidation, aggregation, and sedimentation consequent to prolonged exposure to atmosphere and gravitational and magnetic field gradients have been studied employing transmission electron microscopy, vibrating sample magnetometry, and scanning column magnetometry techniques. The flow properties in magnetic fields have also been investigated. Stable fluids of typically 5 J-1T-1kg-1 have been obtained. It appears that the polymer competes with oxygen at the particle surface to decrease colloidal sensitivity to oxidation.

Item Type:	Article
Peer-reviewed:	No
Date Deposited:	14 Apr 2015 11:03
Publisher:	IEEE
Additional Information:	Full-text of this article is not available in this e-prints service. This article was originally published in IEEE transactions on magnetics, published by and copyright IEEE.
Divisions:	Faculties > Science and Engineering
URI:	https://e-space.mmu.ac.uk/id/eprint/550066
DOI:	https://doi.org/10.1109/20.104544
ISSN	0018-9464

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