Measurement?of?the?Structural?Unit?in?magnetic?dispersions

摘要

Measurement?of?the?Structural?Unit?(SU?–?containing?both?the?solid?phase?and?trapped-fluid?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 concentration-height profiles of the sedimenting system over time that compare well when using?a correspondingly large trapped-liquid 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.?