Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 412, Issue -, Pages 47-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2012.07.013
Keywords
Magnetorheological fluid; Carbonyl iron; Carbon nanotube; Coating; Yield stress; Sedimentation
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Funding
- National Research Foundation, Korea [43450-1]
- National Research Foundation of Korea [2011-0006592] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2012 Elsevier B.V. All rights reserved.
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