Journal
INTERNATIONAL JOURNAL OF SMART AND NANO MATERIALS
Volume 13, Issue 4, Pages 626-642Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19475411.2022.2130466
Keywords
Magnetorheological fluids; nanowires; size dependence
Categories
Funding
- National Science Foundation [CBET-0755696, 0335765]
- Pennsylvania State University Materials Research Institute Nano Fabrication Network
- Pennsylvania State University
- National Nanotechnology Infrastructure Network
- Cornell University
- National Science Foundation United StatesNational Science Foundation United States [CBET-0755696]
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The yield stress of magnetorheological fluids is influenced by particle morphology, and this study investigates the rheological properties of cobalt nanowire suspensions with varying aspect ratios. The results show that the yield stress increases linearly with aspect ratio and reaches a plateau.
The yield stress of magnetorheological (MR) fluids has been shown to depend on particle morphology, but the exact nature of this contribution is still not fully understood. In this study, MR fluids containing 4 vol. % cobalt particles (spherical particles vs. nanowires) suspended in silicone oil were investigated. The influence of the aspect ratio on the rheological properties of suspensions that contained cobalt nanowires with aspect ratios ranging from 10 to 101 in increments of similar to 6 is described. The cobalt nanowires were fabricated using alumina template-based electrodeposition, producing wires with 305 +/- 66 nm diameters. The shear stress was measured as a function of shear rate for increasing applied magnetic fields. The apparent yield stress and viscosity as a function of changing aspect ratio of the nanowire suspensions were determined. At a saturated magnetic flux density, the yield stress was found to increase linearly up to an aspect ratio of 23 (7.1 mu m long wires) at which time the yield stress reached a plateau of 3.7 kPa even as the aspect ratio was further increased. As a comparison, suspensions containing 4 vol. % 1.6 mu m spherical cobalt particles only reached a maximum yield stress of 1.6 kPa. [GRAPHICS]
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