A method and device for measurement of a sedimentation constant of magnetorheological fluids

Gorodkin, S. R.; Kordonski, William; Medvedeva, E. V.; Новикова, З. А.; Shorey, Aric; Jacobs, Stephen D.

doi:10.1063/1.1150638

Cited by 41 publications

(33 citation statements)

References 2 publications

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“…This method was described by Gorodkin et al 21 With this method, the settling velocity of iron particles is characterized by a sedimentation constant parameter (S). It is the ratio of the sedimentation velocity (u) to the acceleration of gravity (g):…”

Section: Accelerated Settling Testmentioning

confidence: 99%

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Compressible magnetorheological fluids

Fuchs

Rashid

Liu

et al. 2009

J of Applied Polymer Sci

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A novel compressible magnetorheological fluid (CMRF) has been synthesized with additives that provide compressibility to the fluid. This CMRF has been designed to provide an elastic component to a magnetorheological fluid (MRF) that can be used as a springless damper. CMRF provides controllable compressibility to the MRF. The controllability of the fluid is achieved by the use of magnetic particles and an external magnetic field, and the fluid is made compressible by the addition of suspended compressible polymer particles. The compressibility of the fluid has been characterized with forcedisplacement measurements. This CMRF has controllable off-state viscosity and high shear yield stress. The incorporation of polymeric particles into the MRF also decreases the settling of iron particles and improves the redispersion of the fluid. To make the fluid more redispersible, the surface of the iron particles is coated with a high-temperature fluorinated polymer.

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Section: Accelerated Settling Testmentioning

confidence: 99%

“…To measure the sedimentation velocity, a centrifugal instrument specifically designed for this purpose is used. 21 Two test tubes filled with CMRFs are held to the centrifuge rotor, which is attached to a casing. The open ends of the test tubes are plugged to prevent the evaporation of the carrier medium during the experiment.…”

Section: Accelerated Settling Testmentioning

confidence: 99%

Compressible magnetorheological fluids

Fuchs

Rashid

Liu

et al. 2009

J of Applied Polymer Sci

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“…An accelerated settling test was described by Gorodkin et al22. The settling rate of the iron particles in the compressible MR fluid was estimated by the sedimentation constant ( S ).…”

Section: Resultsmentioning

confidence: 99%

“…The accelerated settling method is described by Gorodkin et al22 This method measures the settling rate of the iron particles by characterization of a sedimentation constant parameter ( S ). S is given by the ratio of the sedimentation velocity ( u ) to the acceleration of gravity ( g ),23 …”

Section: Methodsmentioning

confidence: 99%

Compressible Magnetorheological Fluids Based on Composite Polyurethane Microspheres

Pramudya

Sutrisno

Fuchs

et al. 2012

Macro Materials & Eng

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A novel CMRF is synthesized from modified silicone oil, containing composite polyurethane microsphere additives, and surface‐coated iron particles. The CMRF is designed to act as a liquid spring with controllable damping properties in a damper system. The fluid compressibility is characterized by force/displacement measurements. The addition of composite polyurethane‐microspheres increases the strength and compressibility of the fluid. It also decreases the concentration of iron particles needed in order to achieve the same yield stress as commercially available MRF. Surface coating surface of the iron particles with poly(2,3,4,5,6‐pentafluorostyrene) via RAFT provides dispersion stability.

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“…[10,11] Thermal conductivity is one of the basic properties of the material. When MR fluids in stable state, namely the parameters of MR fluids such as composition of substance, density and temperature keep the same condition, they have a constant thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Study on preparation and thermal conductivity of high stability magnetorheological fluids

Cheng

Wang

Liu

2014

Journal of the Chinese Advanced Materials Society

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A surface modifier, which has lipophilic groups and chelating groups, was synthesized, and used to modify the surface characteristics of carbonyl iron particles and prepare composite magnetic particles (CMPs). Then a set of oil-based magnetorheological (MR) fluids based on the CMPs were prepared. Finally, the relationship between thermal conductivity and concentration of MR fluids were studied, and an analysis model on thermal conductivity and concentration of MR fluids was built. The result shows that there is a linear correlation between thermal conductivity and concentration of MR fluids, namely k eff ¼ 0.0245 F À 0.08 and k eff /k f ¼ 0.167 F À 0.53 (10 F 50). Applying this model, the concentration variation of the MR fluids can be acquired on the basis of the thermal conductivity variation, and the model can be used to evaluate the sedimentation stability of the MR fluids.

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A method and device for measurement of a sedimentation constant of magnetorheological fluids

Cited by 41 publications

References 2 publications

Compressible magnetorheological fluids

Compressible magnetorheological fluids

Compressible Magnetorheological Fluids Based on Composite Polyurethane Microspheres

Study on preparation and thermal conductivity of high stability magnetorheological fluids

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