Electrorheology of dielectric liquids

Edamura, Kazuya; Otsubo, Yasufumi

doi:10.1007/s00397-003-0337-4

Cited by 11 publications

(11 citation statements)

References 11 publications

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“…It was also shown that an ER effect based on the EHD convection with another liquid is obtained by use of plain electrodes with smooth surface. The ER effects with plain electrodes and with modified electrodes were analyzed with mixtures of fluorinated oil and tri-n-butylamine [113]. Here the conductivity increases with an increase of the concentration of the butylamine, and the ER effect was found to be highest for the mixtures with conductivity of about 10 -8 Sm -1 when the plain electrodes were used.…”

Section: Modified Electrodesmentioning

confidence: 97%

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Electro- and Magneto-Rheological Materials: Stimuli-Induced Rheological Functions

Minagawa¹,

Koyama

2005

COC

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Various materials that show reversible changes in the rheological properties in response to external stimuli, especially electric and/or magnetic fields, have attracted attention because of their possible applications to devices of transformation of electric/magnetic stimulus into mechanical (passive) force. These materials are called electrorheological (ER), magnetorheological (MR), and electromagnetorheological (EMR) materials. The field-responsive properties are regarded as 'rheological functions' induced by the field, which characterize these materials. The ER/MR materials can be classified into some types, i.e. suspensions, homogeneous or heterogeneous liquids, elastomers/gels, etc. according to the rheological characteristics in the absence and presence of the electric/magnetic fields. For each type, the field-induced rheological properties are briefly summarized, followed by some topics on the material preparation, stimuli-induced functions, and/or practical applications are exemplified. The materials chemistry, especially for organic/polymer materials, are mainly focused on here.

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Section: Modified Electrodesmentioning

confidence: 97%

“…Surface-modification of disc-type electrodes with fine fibers have been reported [111][112][113], though the following two examples are based on different concepts for design and application of fibrous materials to the ER device. The first example is the use of fibers, which bridge the electrodes by direct contact.…”

Section: Modified Electrodesmentioning

confidence: 98%

Electro- and Magneto-Rheological Materials: Stimuli-Induced Rheological Functions

Minagawa¹,

Koyama

2005

COC

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“…Compared with the feed II-P-SO 3 H which displays diffuse reflection at 2h 5 19. 5 (d-spacing of 4.5 Å ), II-P-SO 3 H-E exhibits more than one sharp peak, which is considered to be caused by the existence of crystalline structures originated from emeraldine salt units.…”

Section: X-ray Diffraction Analysismentioning

confidence: 98%

Synthesis, characterization and electrorheological effect of sulfosalt‐type liquid‐crystalline ionomers containing polyaniline units

Meng

Zhou

et al. 2013

J of Applied Polymer Sci

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A series of main-chain liquid-crystalline polymers (LCPs) with pendant sulfonic acid groups have been synthesized by use of biphenyl-4,4 0 -diol, 6,7-dihydroxynaphthalene-2-sulfonic acid, and bis(4-(chlorocarbonyl)phenyl) decanedioate in a one-step esterification reaction. Emeraldine base form of polyaniline (PAN) is doped by the synthesized sulfonic acid-containing LCPs to obtain PAN-LCP ionomers. A series of electrorheological (ER) fluids are prepared using the synthesized PAN-LCP ionomers and silicone oil. The chemical structure, liquid-crystalline behavior, dielectric property of LCPs, and PAN-LCP ionomers, and ER effect of the ER fluids are characterized by use of various experimental techniques. The synthesized sulfonic acid-containing LCPs and PAN-LCP ionomers display nematic mesophase. The PAN-LCP ionomers show a slight elevation of glass transition temperatures and decrease of enthalpy changes of nematic-isotropic phase transition compared with corresponding sulfonic acid-containing LCPs. The relative permittivity of the PAN-LCP ionomers is much higher than that of the corresponding sulfonic acid-containing LCPs. The ER effect of the PAN-LCP ionomer dispersions is better than PAN dispersions, suggesting a synergistic reaction should be occurred among liquid crystalline component, and PAN part under electric fields.

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“…subsections 4.1 and 4.2), but due to experimental evidence does not hold true for more general configurations (cf. e.g., ABU-JDAYIL [1996], ABU-JDAYIL and BRUNN [1995, 1996] and EDAMURA and OTSUBO [2004, GEORGIADES [2003], OTSUBO [1997], OTSUBO andEDAMURA [1998, 1999]). …”

Section: Mathematical Models For Electrorheological Fluid Flowsmentioning

confidence: 99%