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 behavior 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 (τy) 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.
Reference:
Hato, MJ, Choi, HJ, Sim, HH et al. 2011. Magnetic carbonyl iron suspension with organoclay additive and its magnetorheological properties. Colloids and Surfaces: A Physicochemical and Engineering Aspects, Vol. 377, pp 103–109
Hato, M., Choi, H., Sim, H., Park, B., & Ray, S. (2011). Magnetic carbonyl iron suspension with organoclay additive and its magnetorheological properties. http://hdl.handle.net/10204/4892
Hato, MJ, HJ Choi, HH Sim, BO Park, and SS Ray "Magnetic carbonyl iron suspension with organoclay additive and its magnetorheological properties." (2011) http://hdl.handle.net/10204/4892
Hato M, Choi H, Sim H, Park B, Ray S. Magnetic carbonyl iron suspension with organoclay additive and its magnetorheological properties. 2011; http://hdl.handle.net/10204/4892.
Copyright: 2011 Elsevier. This is a pre print version of the work. The definitive version is published in the Colloids and Surfaces: A Physicochemical and Engineering Aspects, Vol.377, pp 103–109
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