A blue phase observed for a novel chiral compound possessing molecular biaxiality

Yoshizawa, Atsushi; Sato, Motoaki; Rokunohe, Juri

doi:10.1039/b506167a

Cited by 176 publications

(85 citation statements)

References 27 publications

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“…(S)-1-Methylheptyl 4′-(2-hydroxy-4-octyloxybenzoyloxy)biphenyl-4-carboxylate was prepared using our reported method [24]. To a solution of 6-(4-cyanobiphenyl-4′-yloxy)hexanoic acid (0.12 g, 0.4 mmol) in dichloromethane (18 mL Physical Properties: The initial phase assignments and corresponding transition temperatures for the final compound were determined using thermal optical microscopy using a polarizing microscope (BX-51; Olympus Optical Co. Ltd.) equipped with a temperature control unit (LK-600PM; Japan High Tech).…”

Section: Experimental Preparation Of Materials: (S)-1-methylheptyl 4′mentioning

confidence: 99%

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Electro‐Optical Switching in a Blue Phase III Exhibited by a Chiral Liquid Crystal Oligomer

2007

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Section: Experimental Preparation Of Materials: (S)-1-methylheptyl 4′mentioning

confidence: 99%

“…[24] We report here a fast electric-field-induced phase transition in amorphous BPIII exhibited by a newly designed chiral liquid crystalline molecule. Switching caused by the phase transition between BPIII and N can supply not only a pronounced black state but also a homogeneous bright state.…”

mentioning

confidence: 99%

Electro‐Optical Switching in a Blue Phase III Exhibited by a Chiral Liquid Crystal Oligomer

2007

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“…Recently, several attempts have been proposed to widen the temperature range of the BPs, which describe the stabilizations of the 3D cubic lattice by polymerizing disclination lines [10], and by using a flexoelectricity of twin molecules [11] and a chiral compound possessing molecular biaxiality [12]. We have proposed also the stabilization by confining BPs in 3D polymer network (PN) structure that is formed by a polymerization-induced phase separation of the liquid crystal -prepolymer mixture [13].…”

Section: Introductionmentioning

confidence: 99%

Expanded temperature range of cholesteric blue phase by three dimensional network structures

Ojima

Noma

Arai

et al. 2009

Trans. Mat. Res. Soc. Japan

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Temperature range of cholesteric blue phase (BP) was expanded by infiltrating liquid crystal (LC) that exhibits blue phases into the three dimensional structures such as polymer network (PN) and mixed cellulose ester membrane (MCEM). Reflection spectrum and dielectric properties of the expanded BP have been measured. Cooling rate dependence of the BP temperature range was also investigated, which indicated that the expansion of the BP temperature range upon infiltrating LC into the three dimensional structures was induced by the pinning effect. The expansion of the BP temperature range was induced by pinning effect on the network surfaces of these three-dimensional structures. In particular, the temperature range of BP I in the LC/PN composite has cooling rate dependence and is six times wider than that of pure BP LC compound at 0.1-o C/min cooling rate. Temperature range of BP in MCEM coated with other polymer was wider than that of in MCEM without polymer. The interaction between the surface of structure and LC molecules was affect the pinning power.Key words: cholesteric, blue phase, three-dimensional structure, membrane, pinning effect INTRODUCTIONThe cholesteric blue phases (BPs) have three-dimensional (3D) helical structures and appear in temperature range between a chiral nematic phase and an isotropic liquid phase [1]. Theoretical and experimental works have demonstrated that chiral nematic liquid crystals with short pitch can form up to three distinct BPs, blue phase I (BPI), blue phase II (BPII) and blue phase III (BPIII). Their 3D structures have the lattice constant in the order of visible wavelength and include regularly ordered disclinations resulting from the 3D helicoidal molecular alignment [2,3]. From the viewpoint of display application, since BPs are optically isotropic, display devices based on them should have a wide view angle and should not require an alignment process. In addition, because of their 3D helical structure with a periodicity in the order of visible wavelength, applications to photonic crystals [4-6] and fast electro-optical modulation [7][8][9] are also expected.Despite their potential applications, BPs appear in very narrow temperature range because of the inevitable existence of disclination. Recently, several attempts have been proposed to widen the temperature range of the BPs, which describe the stabilizations of the 3D cubic lattice by polymerizing disclination lines [10], and by using a flexoelectricity of twin molecules [11] and a chiral compound possessing molecular biaxiality [12]. We have proposed also the stabilization by confining BPs in 3D polymer network (PN) structure that is formed by a polymerization-induced phase separation of the liquid crystal -prepolymer mixture [13]. These synthesize atmosphere leads to obscure mechanism of stabilization of BPs.

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“…The other is widening the blue phase range by changing the molecular geometry or physical characteristics of LCs, such as the dimer-mesogen structure with a high flexoelectric ratio, proposed by Coles and Pivnenko [11], and the 'T'-shaped molecular geometry synthesized by Yoshizawa et al [12]; the blue phase ranges of 44 and 29…”

Section: Introductionmentioning

confidence: 99%

The liquid crystal blue phase induced by bent-shaped molecules with different terminal chain lengths

Zheng

Shen²,

Huang

2011

New J. Phys.

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A blue phase observed for a novel chiral compound possessing molecular biaxiality

Cited by 176 publications

References 27 publications

Electro‐Optical Switching in a Blue Phase III Exhibited by a Chiral Liquid Crystal Oligomer

Electro‐Optical Switching in a Blue Phase III Exhibited by a Chiral Liquid Crystal Oligomer

Expanded temperature range of cholesteric blue phase by three dimensional network structures

The liquid crystal blue phase induced by bent-shaped molecules with different terminal chain lengths

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