Article ID Journal Published Year Pages File Type
593953 Colloids and Surfaces A: Physicochemical and Engineering Aspects 2012 10 Pages PDF
Abstract

In order to improve not only the magnetorheological (MR) properties of soft magnetic carbonyl iron (CI) but also its dispersion stability, we fabricated a dense network of multi-walled carbon nanotubes (MWCNTs) on the surface of CI particles by using 4-aminobenzoic acid as a grafting agent through a two-step method: ultrasonication and solvent casting, based on the self-assembly of MWCNTs which have a similar density to the polymer but better magnetic properties due to the iron catalyst located in the MWCNT. The influence of coating layers on magnetic properties along with MR performance such as yield stress behavior and shear viscosity were investigated by a vibrating sample magnetometer and rotational rheometer. The suspension stability was found to be improved from a Turbiscan test.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► MWCNT was coated onto magnetic carbonyl iron via self-assembly forming core/shell structure. ► Ultrasonication was adopted to enhance MWCNT coating. ► Magnetorheological performance along with sedimentation was examined showing improved characteristics.

Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
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