X-ray holographic imaging of magnetic order in meander domain structures

Tiberto, P., Spezzani, Carlo, Popescu, Horia, Fortuna, Franck, Delaunay, Renaud, Tortarolo, Marina, Jaouen, Nicolas, Sacchi, Maurizio, Affronte, M. et al (2013) X-ray holographic imaging of magnetic order in meander domain structures. EPJ Web of Conferences, 40 . 01001. ISSN 2100-014X

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Official URL: http://dx.doi.org/10.1051/epjconf/20134001001


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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