Electric‐Field‐Induced Reversible Viscosity Change in a Columnar Liquid Crystal

Kaneko, Kosuke; Mandai, Atsuhiko; Heinrich, Benoît; Donnio, Bertrand; Hanasaki, Tomonori

doi:10.1002/cphc.201000587

Cited by 15 publications

(16 citation statements)

References 41 publications

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“…ER liquid‐crystal molecules typically have length of 20 Å, making them suitable for microfluidic applications . However, their time response and change in yield stress tend to be lower than for particulate ER fluids (demonstrated 3–50 kPa change, >5 s) . Liu et al gave a comprehensive comparison of yield stress and particle sizes between different ER fluid suspensions …”

Section: Electrically Responsive Soft Actuatorsmentioning

confidence: 99%

Soft Actuators for Small‐Scale Robotics

et al. 2016

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This review comprises a detailed survey of ongoing methodologies for soft actuators, highlighting approaches suitable for nanometer- to centimeter-scale robotic applications. Soft robots present a special design challenge in that their actuation and sensing mechanisms are often highly integrated with the robot body and overall functionality. When less than a centimeter, they belong to an even more special subcategory of robots or devices, in that they often lack on-board power, sensing, computation, and control. Soft, active materials are particularly well suited for this task, with a wide range of stimulants and a number of impressive examples, demonstrating large deformations, high motion complexities, and varied multifunctionality. Recent research includes both the development of new materials and composites, as well as novel implementations leveraging the unique properties of soft materials.

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Section: Electrically Responsive Soft Actuatorsmentioning

confidence: 99%

Soft Actuators for Small‐Scale Robotics

et al. 2016

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“…For the further development of the utility of LCs, we have investigated the electro-rheological (ER) effect in which viscosity is controlled by the strength of an applied electrical field. [1][2][3][4] ER fluids have been widely studied as smart materials for industrial utilities [5][6][7][8][9][10] since the ER effect was first discovered by Winslow in 1949. [11] ER fluids are divided into two types on the basis of the component of the fluids and the mechanism of the effect.…”

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confidence: 99%

Electric‐Field‐Induced Viscosity Change of a Nematic Liquid Crystal with Gold Nanoparticles

et al. 2015

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The electro-rheological (ER) effect of a composite material consisting of a nematic liquid crystal (LC) and gold nanoparticles covered with mesogenic groups is discussed. The gold nanoparticles are covered by alkyl chains and liquid-crystalline compounds. The influences of the alkyl-chain length and the coverage by the alkyl chain and the mesogenic group on the miscibility of the nanoparticles with the LC are investigated by polarizing optical microscopy (POM). The presence of the gold nanoparticles in the nematic LC (5CB) leads to an enhanced ER response compared to that observed for 5CB. The prominent ER effect observed in this study is supported by the two mechanisms proposed, that is, the homogeneous and heterogeneous mechanisms. This study demonstrates the potential of a hybrid system consisting of an LC and gold nanoparticles to improve the ER effect.

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“…We have attempted to develop LCs for novel rheological applications [9][10][11][12][13][14]. After Winslow discovered the electro-rheological (ER) effect, in which viscosity is controlled by the strength of an applied electric field [15], a number of ER fluids have been studied as smart materials for industrial use [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The phase transition behaviour and electro-rheological effect of liquid crystalline siloxane dimers

et al. 2011

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Symmetrical liquid crystalline dimers have been synthesised, composed of rod-like mesogenic units with polar groups and a siloxane core of varying length in the central region. All the dimers containing siloxane units have been shown to exhibit a smectic A phase, confirmed by polarising optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Rheological properties under an applied electric field were investigated by rotational rheometer. The influence of the siloxane core length on rheological properties has been investigated, and in addition the behaviour of the liquid crystalline dimers in the smectic A phase under an applied electric field has been observed by POM.

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Electric‐Field‐Induced Reversible Viscosity Change in a Columnar Liquid Crystal

Cited by 15 publications

References 41 publications

Soft Actuators for Small‐Scale Robotics

Soft Actuators for Small‐Scale Robotics

Electric‐Field‐Induced Viscosity Change of a Nematic Liquid Crystal with Gold Nanoparticles

The phase transition behaviour and electro-rheological effect of liquid crystalline siloxane dimers

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