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9 Feb 1998

Volume 72, Issue 6, pp. 627-747

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The dependence of particle permittivity on the shear stress of electrorheological fluids

Yucheng Lan, Shouqiang Men, Xiaopeng Zhao, and Kunquan Lu

Appl. Phys. Lett. 72, 653 (1998); http://dx.doi.org/10.1063/1.120836 (3 pages) | Cited 9 times

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A ferroelectric TGS particle/silicone oil electrorheological (ER) fluid is introduced to investigate the dielectric dependence of the ER effect. The dielectric constant of ferroelectric changes violently with temperature at the Curie temperature (Tc). By measuring temperature dependence of shear stress across Tc, the effect of dielectric constant on shear stress can be directly obtained. All the results are more reliable due to the same conditions, such as size, shape, composition of particles, as well as the same chemical nature of particles and interface property between particles and liquid. The measurement was carried out under a high-frequency (1000 Hz) ac electric field where ER effect is dielectric constant dominated. For the first time, the dependence of the ER effect on dielectric mismatch has been quantitatively obtained experimentally. There is an obvious deviation of available theoretical calculations from our measured data. A more rigorous theoretical study should be developed to quantitatively interpret the relation of the shear stress and the permittivity mismatch factor. © 1998 American Institute of Physics.
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77.84.Nh Liquids, emulsions, and suspensions; liquid crystals
77.22.Ch Permittivity (dielectric function)
83.80.Gv Electro- and magnetorheological fluids
77.80.B- Phase transitions and Curie point

Ion–ion plasmas and double layer formation in weakly collisional electronegative discharges

V. I. Kolobov and D. J. Economou

Appl. Phys. Lett. 72, 656 (1998); http://dx.doi.org/10.1063/1.120837 (3 pages) | Cited 20 times

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Plasmas of electronegative gases often separate into two distinct regions: an ion–ion core and an electron–ion periphery. Under certain conditions, a double layer may form at the boundary between the two regions. In weakly collisional three-component electronegative plasmas, formation of a double layer depends on the ratio of the electron to negative ion temperatures, and the ratio of the electron to positive ion densities. © 1998 American Institute of Physics.
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52.80.-s Electric discharges
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Jm Ionization of plasmas
52.27.Jt Nonneutral plasmas
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