Cholesteric Liquid Single‐Crystal Elastomers (LSCE) Obtained by the Anisotropic Deswelling Method

Kim, Sung Tae; Finkelmann, Heino

doi:10.1002/1521-3927(20010301)22:6<429::aid-marc429>3.0.co;2-#

Cited by 111 publications

(121 citation statements)

References 5 publications

(5 reference statements)

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“…For this we detect the rotatory power dΨ/dz of the elastomer sample (prepared such that the axis of the imprinted helix is aligned perpendicular to the elastomer film, in the geometry shown in Fig. 1 and investigated in [15,23]). In a material with no intrinsic molecular chirality the rotatory power is determined only by the remaining cholesteric modulation of uniaxial dielectric constant in an imprinted helix.…”

Section: Imprinting and Stereo-selectivitymentioning

confidence: 99%

Chirality transfer and stereoselectivity of imprinted cholesteric networks

2006

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Imprinting of cholesteric textures in a polymer network is a method of preserving a macroscopically chiral phase in a system with no molecular chirality. By modifying the elastics properties of the network, the resulting stored helical twist can be manipulated within a wide range since the imprinting efficiency depends on the balance between the elastics constants and twisting power at network formation. One spectacular property of phase chirality imprinting is the created ability of the network to adsorb preferentially one stereo-component from a racemic mixture. In this paper we explore this property of chirality transfer from a macroscopic to the molecular scale. In particular, we focus on the competition between the phase chirality and the local nematic order. We demonstrate that it is possible to control the subsequent release of chiral solvent component from the imprinting network and the reversibility of the stereo-selective swelling by racemic solvents.

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Section: Imprinting and Stereo-selectivitymentioning

confidence: 99%

Chirality transfer and stereoselectivity of imprinted cholesteric networks

2006

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“…More recently, UV lasing in pure liquid crystals was demonstrated in a system where the liquid crystal acts both as the active medium and the host. [9] Very recently [10] the first cholesteric liquid single crystal elastomers (cholesteric LSCE) with a spontaneous and uniform orientation of the helical structure have become available. The most interesting aspect of these systems is that the helicoidal structure can be modified by external mechanical fields and that these materials do not need any mechanical support for a stable orientation of the helicoidal structure as compared to low molar mass liquid crystals.…”

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confidence: 99%

Tunable Mirrorless Lasing in Cholesteric Liquid Crystalline Elastomers

et al. 2001

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“…Such an effect has been studied for cholesteric sidechain elastomers in detail experimentally [59,60]. The second one (∼ τ Ω ) relates static director deformations with relative rotations.…”

Section: Macroscopic Dynamics Of Chiral Polar Gelsmentioning

confidence: 99%

Macroscopic behavior of polar nematic gels and elastomers

2016

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Abstract. We present the derivation of the macroscopic equations for uniaxial polar nematic gels and elastomers. We include the strain field as well as relative rotations as independent dynamic macroscopic degrees of freedom. As a consequence, special emphasis is laid on possible static and dynamic cross-couplings between these macroscopic degrees of freedom associated with the network, and the other macroscopic degrees of freedom including reorientations of the macroscopic polarization. In particular, we find static and dissipative dynamic cross-couplings between strain fields and relative rotations on one hand and the macroscopic polarization on the other that allow for new possibilities to manipulate polar nematics. To give one example each for the effects of a static and a dissipative cross-coupling: we find that a static electric field applied perpendicularly to the polar preferred direction leads to relative rotations while dynamically relative rotations can lead to transverse electric currents. In addition to a permanent network, we also consider the effect of a transient network, which is particularly important for the case of gels, melts and concentrated polymer solutions. A section on the influence of macroscopic chirality is included as well.

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Cholesteric Liquid Single‐Crystal Elastomers (LSCE) Obtained by the Anisotropic Deswelling Method

Cited by 111 publications

References 5 publications

Chirality transfer and stereoselectivity of imprinted cholesteric networks

Chirality transfer and stereoselectivity of imprinted cholesteric networks

Tunable Mirrorless Lasing in Cholesteric Liquid Crystalline Elastomers

Macroscopic behavior of polar nematic gels and elastomers

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