Electrorheological polymer‐based suspensions

Kordonsky, V.I.; Коробко, Е. В.; Lazareva, T. G.

doi:10.1122/1.550240

Cited by 20 publications

(12 citation statements)

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“…Wu and Shen24 reported an 11% optimum concentration in the ER studies of chitin and chitosan suspensions in SO, and Kordonsky et al18 reported a 20% optimum concentration in the ER studies of carboxy methylcellulose suspensions in transformer oil.…”

Section: Resultsmentioning

confidence: 99%

“…In a number of cases, a polymer contained acid or other functional groups introduced by chemical modification or by the addition of molecular acids 18. The use of polymer fillers, in the H + form and as Li + , K + , Na + , NH

_{4}^{+}

, and other salts, was shown to improve ER sensitivity, and Li + was found to be the best ion among the ions studied 18–20…”

Section: Introductionmentioning

confidence: 94%

“…For this purpose, poly(methacrylic acid), poly(acrylic acid)s, and their esters,12 liquid‐crystal polymers,16 and semiconducting polymers2, 9–12, 17 have been reported in the literature. In a number of cases, a polymer contained acid or other functional groups introduced by chemical modification or by the addition of molecular acids 18. The use of polymer fillers, in the H + form and as Li + , K + , Na + , NH

_{4}^{+}

, and other salts, was shown to improve ER sensitivity, and Li + was found to be the best ion among the ions studied 18–20…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization, and partial hydrolysis of polyisoprene‐co‐poly(tert‐butyl methacrylate) and electrorheological properties of its suspensions

Yavuz

Ünal

2003

J of Applied Polymer Sci

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ABSTRACT:The synthesis, characterization, partial hydrolysis, and salt formation of polyisoprene-co-poly(tert-butyl methacrylate) and the electrorheological properties of its suspensions were investigated. The copolymer was characterized by gel permeation chromatography, viscosity measurements, 1 H-NMR, Fourier transform infrared spectroscopy, particle size measurements, and elemental analysis. The poly(tert-butyl methacrylate) units of the copolymer were partially hydrolyzed by p-toluene sulfonic acid monohydrate and then converted into a lithium salt. The conductivity of this copolymeric salt was measured to be 1.4 ϫ 10 Ϫ9 S cmϪ1 . Suspensions of the copolymeric salt were prepared in four insulating oils (silicone oil, mineral oil, trioctyl trimellitate, and dioctyl phatalate) in a series of concentrations (5-33%, m/m). The gravitational stabilities of these suspensions were determined at 20 and 80°C. The flow times of the suspensions were measured under no electric field (electric field strength ϭ 0) and under an applied electric field (electric field strength 0), and the electrorheological activity was observed. Furthermore, the effects of the solid particle concentration, the shear rate, the electric field strength, a high temperature, and the addition of promoters on the electrorheological activities of the suspensions were investigated, and the excess shear stresses were determined.

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Section: Resultsmentioning

confidence: 99%

_{4}^{+}

, and other salts, was shown to improve ER sensitivity, and Li + was found to be the best ion among the ions studied 18–20…”

Section: Introductionmentioning

confidence: 94%

_{4}^{+}

, and other salts, was shown to improve ER sensitivity, and Li + was found to be the best ion among the ions studied 18–20…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, characterization, and partial hydrolysis of polyisoprene‐co‐poly(tert‐butyl methacrylate) and electrorheological properties of its suspensions

Yavuz

Ünal

2003

J of Applied Polymer Sci

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“…Even an organic electrolyte can exhibit an ER effect if a particulate phase of different effective electrical permittivity is allowed to disperse in that phase. Furthermore, there have been studies on ERFs in which the solvent phase of the ERF is aqueous [9] or the ER effect is water activated [64,65]. Another class of fluids mentioned above consists of liquid crystals, which also exhibit ER effects [66].…”

Section: -2mentioning

confidence: 97%

Electro-osmosis of electrorheological fluids

2013

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Electrorheological fluids are suspensions that are characterized by a strong functional dependence of the constitutive behavior of the fluids on the electric field. In this work, we consider electro-osmosis of an electrorheological fluid through a channel where a transverse, nonuniform electric field is spontaneously induced due to the presence of an electric double layer that is manifested due to surface charge density at the channel wall. We reveal a nonlinear interplay between the applied electric field, the induced electric field, and the observed flow profiles, which is fundamentally distinctive from other types of nonlinear electrokinetic effects that have been extensively discussed in the literature, in a sense that here an interaction between the applied electric field, the induced electric field, and the dependence of the rheology on the resultant electric field happens to be the focal source of nonlinearity in the observed phenomena. We analyze the electro-osmotic flow control through the exploitation of a combined nonlinear interplay of the driving electrokinetic forces and the resistive viscous interactions, which gives rise to distinctive flow regimes as compared to those realized in cases of either Newtonian fluids or non-Newtonian fluids having electric-field-independent flow rheology.

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“…Electrorheological fluid (commonly abbreviated as ERFs) is one such class of 'smart' material which changes its rheological properties in presence of an electric field [1][2][3][4][5][6][7][8]. The so called Electrorheological (ER) effect is primarily manifested in the abrupt change of the apparent viscosity of the fluid [3,[9][10][11][12][13][14][15] by orders of magnitude upon action by an electric field of high strength.…”

Section: Introductionmentioning

confidence: 99%