Journal ArticleDOI
Suspension of layered particles: an optimum electrorheological fluid for d.c. applications
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In this article, a comparison is made between two types of solid particles used in electrorheological fluids: particles with homogeneous electrical properties versus layered particles with a semi-conducting core surrounded by an outer layer of lower conductivity.Abstract:
A comparison is made between two types of solid particles used in electrorheological fluids: particles with homogeneous electrical properties versus layered particles with a semi-conducting core surrounded by an outer layer of lower conductivity. Rheological measurements of these suspensions under steady shear and d.c. electric field show that the layered particle system produces the same yield stress but with a substantially reduced electric current. X-ray spectroscopic analysis confirms that these particles have a thin layer of SiOx on the outer surface which causes the reduction in conductivity. Measurement of the dielectric permittivity followed by analysis using the Maxwell-Wagner model of polarization indicates that the conductivity of the outer layer is about 0.62 times that of the core region.read more
Citations
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Synthesis and electrorheological characteristics of polyaniline-coated poly(methyl methacrylate) microsphere: Size effect
TL;DR: In this paper, three different core sizes of PAPMMAs (2, 4.5, and 9 μm) with the same weight ratio of PANI, the larger core having the thicker PANI shell, were prepared.
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Synthesis and electrorheological characteristics of microencapsulated polyaniline particles with melamine-formaldehyde resins
TL;DR: In this paper, the authors synthesized microencapsulated polyaniline particles with melamine-formaldehyde (MF) resins, which played the role of an insulator between the polyanILine particles.
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Electrorheological characteristics of phosphate cellulose-based suspensions
TL;DR: In this article, a rotational rheometer with a high voltage generator in both steady and oscillatory shear modes was used to investigate the effects of electric field strength and particle concentration on anhydrous electrorheological (ER) performance.
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Electrorheological properties of perchloric acid-doped polythiophene suspensions
TL;DR: In this paper, the effects of electric field strength, particle concentration, and particle conductivity on electrorheological (ER) characteristics were investigated in poly(3-thiopheneacetic acid), PTAA-based fluids.
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Linear viscoelasticity of semiconducting polyaniline based electrorheological suspensions
TL;DR: In this paper, a dry-base electrorheological (ER) fluid was prepared by dispersing synthesized semiconducting polyaniline (PANI) particles into silicone oil, and its viscoelastic properties were investigated under applied electric fields using a rotational rheometer.
References
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Journal ArticleDOI
Induced Fibration of Suspensions
TL;DR: In this article, the authors describe some of the phenomena found to have their origin in electrically induced fibration of small particles in fluid liquid suspension, including the induced shear resistances found in layers of the fluid when bounded by potentialized electrode surfaces.
Book
Dielectrics and Waves
TL;DR: Macroscopic approach complex permittivity and permaebility polarization and magnetization couloumb and dipole fields space-charge fields correlations between electric and magnetic phenomena Maxwell's field equations electromagnetic waves in unbounded space descriptions of dielectrics by various sets of parameters forces field energy and radiation polarized radiation dipole radiation boundary conditions Fresnel's equations reflection and refraction of plane waves by loss-free dielectric standing waves interference optics skin effect as discussed by the authors.
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ER fluid requirements for automotive devices
TL;DR: In this article, the requirements necessary for electrorheological fluids to be used in automotive devices are discussed along with the necessary fluid design data, and the feasibility of each device with each fluid level was determined, and for those cases predicted as unfeasible, methods that could be used to make them feasible are discussed.
Journal ArticleDOI
The metal-particle/insulating oil system : an ideal electrorheological fluid
TL;DR: In this article, the electrorheological properties of a model system consisting of oxidized metal particles in an insulating oil are analyzed, and it is suggested that previous dc experiments on such systems have failed to reveal strong ER activity because of conductivity effects.