General phase-structure relationship in polar rod-shaped liquid crystals: Importance of shape anisotropy and dipolar strength

Li, Jinxing; Wang, Zhidong; Deng, Minghui; Zhu, Yunfeng; Zhang, Xinxin; Xia, Runli; Song, Yaohao; Hisai, Yuki; Aya, Satoshi; Huang, Mingjun

doi:10.1016/j.giant.2022.100109

Cited by 37 publications

(82 citation statements)

References 25 publications

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“…Li et al recently reported a significant number of new N F materials, many of which are homologous in structure with DIO with alternate polar functionalities and terminal chain lengths. 33 As a general trend, for a given core structure the shorter terminal chain lengths give the highest N F onset temperature, mirroring the behaviour of the earlier RM230-like materials. The 4-cyano-2′,3,5,6′-tetrafluorobiphenyl end group results in a remarkable increase in the onset temperature of the N F phase; the onset temperature of the propyl derivative is over 100 °C higher than that of DIO, with the methyl derivative being higher still.…”

Section: Materials and The Incidence Of The Nf Phasesupporting

confidence: 59%

“…28 Li et al recently reported a significant number of new N F materials, many of which are homologous in structure with DIO with alternate polar functionalities and terminal chain lengths. 33 As a general trend, for a given core structure the shorter terminal chain lengths give the highest N F onset temperature, mirroring the behaviour of the earlier RM230like materials. The 4-cyano-2 0 ,3,5,6 0 -tetrafluorobiphenyl end Fig.…”

Section: Materials and The Incidence Of The N F Phasesupporting

confidence: 59%

“…5 Structural variants of DIO; transition temperatures (1C) are on cooling from the isotropic liquid. 28,[31][32][33] Green and red arrows indicate increased and decreased T NF-N relative to the parent material, respectively, while a black dash indicates the absence of the N F phase. 39 As with all N F materials known to date, these materials feature polar groups (in this case, 1,3-dioxane, 2,5difluorophenyl, nitrile) oriented in such a way to give a large longitudinal molecular electric dipole moment.…”

Section: Emerging Materials Classesmentioning

confidence: 99%

“…7 Structural variants of RM734-CN(2F); transition temperatures (1C) are on cooling from the isotropic liquid. 5,33 Green and red arrows indicate increased and decreased T NF-N relative to the parent material, respectively, while a black dash indicates the absence of the N F phase; note that the parent material does not display the N F phase.…”

Section: Emerging Materials Classesmentioning

confidence: 99%

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A new order of liquids: polar order in nematic liquid crystals

Mandle

2022

Soft Matter

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Section: Materials and The Incidence Of The Nf Phasesupporting

confidence: 59%

Section: Materials and The Incidence Of The N F Phasesupporting

confidence: 59%

Section: Emerging Materials Classesmentioning

confidence: 99%

Section: Emerging Materials Classesmentioning

confidence: 99%

See 2 more Smart Citations

A new order of liquids: polar order in nematic liquid crystals

Mandle

2022

Soft Matter

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“…12 Progress in understanding and exploiting the unique physics of the NF phase is reliant on the design and synthesis of new materials, with significant progress in the since the report of the first polar nematic materials in 2017. 7,8,[13][14][15][16][17][18][19][20][21] The NF materials reported to date are exclusively rod-like, with polar groups (for example nitro, fluoro, cyano, esters, difluoromethoxy) oriented such that there is a large molecular electric dipole moment which is oriented close to parallel to the molecules long axis. Around 200 compounds have been reported in the literature as exhibiting the NF, 7,[13][14][15][16][18][19][20][21][22][23] and these are presently restricted to covalently bonded materials.…”

Section: Introductionmentioning

confidence: 99%

Supermolecular Ferroelectric Nematic Materials

Mandle

2022

Preprint

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The discovery of a new nematic phase variant with polar order and ferroelectricity, the NF phase, is a significant milestone in soft matter research. Herein we describe the preparation of hydrogen-bonded complexes between 4-(2,4-dimethoxybenzoyloxy)benzoic acid and either 4-nitropyridine or 3-fluoro-4-nitropyridine, these being analogous in structure to the archetypal NF material RM734. Complexes were isolated using a semi-automated process we term Machine Vision Aided Crystallisation. We find these complexes exhibit classical and polar (NF) nematic phases despite the large reduction in electric dipole moment that results from swapping a phenyl ring for 4-pyridyl. DFT calculations support the hypothesis that the onset of polar order is not simply a product of electric dipole magnitude, but rather

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Lowering of Electrostatic Actuator Driving Voltage and Increasing Generated Force Using Spontaneous Polarization of Ferroelectric Nematic Liquid Crystals

Nishimura

Masuyama

Shimizu

et al. 2022

Advanced Physics Research

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Although electrostatic actuators have a simple structure and are lightweight, their range of application is limited because a high applied voltage of more than several kilovolts is required for practical use. Since the force acting between the electrodes of an electrostatic actuator is determined by the electric charge accumulated at the electrode/dielectric interface, the focus is on spontaneous polarization of ferroelectrics to increase the charge. As the ferroelectric material, a nematic liquid crystal material with a spontaneous polarization of 5 μC cm −2 is used. It is demonstrated that a force of 1.3 N is generated at an applied electric field of 0.5 MV m −1 . This force is 1200 times higher than that for standard paraelectric materials with a dielectric constant of ten. Further, the generated force responds linearly to the applied voltage, whereas it is proportional to the square of the applied voltage for paraelectric materials. The actuator function of this ferroelectric is examined using a double-helical coil electrode fabricated using a 3D printer. It can be successfully operated at a voltage of several tens of volts. Under an electric field of 0.25 MV m −1 , a remarkable contraction of 6.3 mm occurs, corresponding to 19% of the original length.

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General phase-structure relationship in polar rod-shaped liquid crystals: Importance of shape anisotropy and dipolar strength

Cited by 37 publications

References 25 publications

A new order of liquids: polar order in nematic liquid crystals

A new order of liquids: polar order in nematic liquid crystals

Supermolecular Ferroelectric Nematic Materials

Lowering of Electrostatic Actuator Driving Voltage and Increasing Generated Force Using Spontaneous Polarization of Ferroelectric Nematic Liquid Crystals

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