Measurement of the Structural Unit in magnetic dispersions

Mercer, Tim orcid iconORCID: 0000-0002-1557-2138 and Bissell, Philip orcid iconORCID: 0000-0002-8024-1757 (2013) Measurement of the Structural Unit in magnetic dispersions. EPJ Web of Conferences, 40 (-). 01003-1. ISSN 2100-014X

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Measurement of the Structural Unit (SU - containing both the solid phase and trapped­fluid within their associated structures) in magnetic dispersions has been carried out using Hindered Settling (HS) analysis that uses scanning column magnetometry and cone & plate rheology techniques. From this, an equivalent Stokes' particle diameter, d, of (5.2 ≤ d ≤ 8.2) microns was determined that is approximately 22 times larger than the iron oxide particles of our formulation. A previous computer simulation based on HS theory produces complete concentration­height profiles of the sedimenting system over time that compare well when using a correspondingly large trapped­liquid fraction of around the 84% of the SU volume determined here, giving confidence in the result. As interest in iron oxide suspensions for potential biomedical and chemical decontamination/catalysis applications continues to grow an understanding of their structures is likely to become increasingly important.

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