Theory of a helicoidal cholesteric phase induced by an external field

Matsuyama, Akihiko

doi:10.1080/02678292.2016.1144810

Cited by 10 publications

(2 citation statements)

References 44 publications

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“…In Section 3 , we give a summary of this paper. Based on the neoclassical rubber theory of a nematic gel [ 3 , 17 ] and the free energy of a

phase [ 24 , 25 ], we show the elastic free energy of a

gel under the external field in Section 4 .…”

Section: Introductionmentioning

confidence: 99%

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Volume Phase Transitions of Heliconical Cholesteric Gels under an External Field along the Helix Axis

Matsuyama

2020

Gels

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We present a mean field theory to describe cholesteric elastomers and gels under an external field, such as an electric or a magnetic field, along the helix axis of a cholesteric phase. We study the deformations and volume phase transitions of cholesteric gels as a function of the external field and temperature. Our theory predicts the phase transitions between isotropic (I), nematic (N), and heliconical cholesteric (ChH) phases and the deformations of the elastomers at these phase transition temperatures. We also find volume phase transitions at the I−ChH and the N−ChH phase transitions.

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“…In Section 3 , we give a summary of this paper. Based on the neoclassical rubber theory of a nematic gel [ 3 , 17 ] and the free energy of a

phase [ 24 , 25 ], we show the elastic free energy of a

gel under the external field in Section 4 .…”

Section: Introductionmentioning

confidence: 99%

“…In this Appendix, we derive the distortion free energy

(Equation ( 36 )) [ 24 ]. Using the tensor order parameter (Equation ( 31 )), the first term of the free energy

(Equation ( 32 )) is given by [ 29 ]

where the dimensionless elastic constants

are associated with splay, twist, and bend deformations of the director, respectively [ 18 ].…”

mentioning

confidence: 99%

Volume Phase Transitions of Heliconical Cholesteric Gels under an External Field along the Helix Axis

Matsuyama

2020

Gels

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Tunable reflectance of an inverse opal–chiral nematic liquid crystal multilayer device by electric- or thermal-control

Zhang

Zhao

Wen

et al. 2017

Phys. Chem. Chem. Phys.

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A new type of electric- or thermal-responsive multilayer device composed of SiO bilayer inverse opal (IOP) and chiral nematic liquid crystals (N*LCs) was developed. Bilayer IOP was fabricated by layer-by-layer assembly of polystyrene (PS) spheres with two different sizes and showed a reflectance in an extended range of the near-infrared region. Furthermore, the electrically or thermally tunable reflectance of the bilayer-IOP-N*LC device was investigated. The device exhibited the photonic bandgap (PBG) of the N*LC-IOP composite structure with the application of an electric field (voltage-on), while it presented the reflectance of N*LCs without an electric field (voltage-off) and the electrically-responsive behaviour could be reversibly switched. Besides, the device exhibited a gradient redshift of reflectance as temperature increased below the clearing point (T) while it showed the PBG of the N*LC-IOP composite structure when the temperature was above T.

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Field-induced oblique helicoidal cholesteric phases in mixtures of chiral and achiral liquid crystalline molecules

Matsuyama

2017

Liquid Crystals

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Theory of a helicoidal cholesteric phase induced by an external field

Cited by 10 publications

References 44 publications

Volume Phase Transitions of Heliconical Cholesteric Gels under an External Field along the Helix Axis

Volume Phase Transitions of Heliconical Cholesteric Gels under an External Field along the Helix Axis

Tunable reflectance of an inverse opal–chiral nematic liquid crystal multilayer device by electric- or thermal-control

Field-induced oblique helicoidal cholesteric phases in mixtures of chiral and achiral liquid crystalline molecules

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