Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 377, Issue 1-3, Pages 103-109Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.12.029
Keywords
Carbonyl iron; Organoclay; Magnetorheological fluid; Sedimentation
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Funding
- DST/CSIR, Republic of South Africa
- National Research Foundation of Korea [39704-1]
- National Research Foundation of Korea [2009-0080253, 핵09A1312] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Soft magnetic carbonyl iron (CI) based magnetorheological (MR) fluids containing three different loadings of submicron-sized organoclay were prepared. The MR characteristics were measured via rotational and oscillatory tests, in which the flow curves exhibited a non-Newtonian behaviour for all investigated samples. The dynamic yield stress change was measured as a function of magnetic field strength by adopting a linear fit of the relation of log (tau(y)) proportional to log (H), which was originally applied for electrorheological fluids. The viscoelastic performances of the pure CI suspension and the CI/organoclay suspensions showed the existence of a solid-like character. The sedimentation ratio was also investigated to confirm the role of sub-micron organoclay particles on the MR properties, in which the dispersion stability of pure CI was improved with increasing the content of organoclay in the CI suspension. (C) 2010 Elsevier B.V. All rights reserved,
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