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Article
Chemistry, Multidisciplinary
Naila Tufaha et al.
Summary: This study reports the synthesis and characterisation of two series of low molar mass mesogens to investigate the effect of changing the position of a lateral alkoxy chain. The materials in the NT3.m series exhibited both a conventional nematic phase and a ferroelectric nematic phase, while the materials in the NT3F.m series exhibited direct transitions between N-F-I phases. The addition of a fluorine atom in NT3F.1 led to a decrease in the N-F transition temperature, but the N-F transition temperatures were higher in the NT3F.m series compared to the NT3.m series. The role of the lateral chain in inhibiting anti-parallel associations and its effect on the electronic properties were found to be key factors in driving the formation of the N-F phase.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
C. L. Folcia et al.
Summary: Materials with high nonlinear optical (NLO) susceptibilities are considered as potential candidates for the next-generation NLO devices. Ferroelectric nematic (N-F) materials are argued to have the potential to become materials for the next-generation NLO devices. We conducted a study on a prototype N-F material and found a high nonlinear susceptibility in the transparent regime, which is one of the highest reported in ferroelectric liquid crystals. Despite the fact that the studied molecule was not specifically designed for NLO applications, it is concluded that there is still potential to obtain N-F materials with enhanced properties.
Article
Chemistry, Multidisciplinary
Richard J. Mandle
Summary: The discovery of a new variant of the N-F phase with polar order and ferroelectricity is a significant milestone in soft matter research. The preparation of hydrogen-bonded complexes between 4-(2,4-dimethoxybenzoyloxy)benzoic acid and either 4-nitropyridine or 3-fluoro-4-nitropyridine is described, and the complexes exhibit classical and polar nematic phases. DFT calculations support the hypothesis that the onset of polar order is a result of subtle interactions between regions of opposing electrostatic potential, rather than solely dependent on the electric dipole moment.
Article
Chemistry, Physical
Damian Pociecha et al.
Summary: In this study, strongly dipolar mesogenic compounds with a chiral center located in a lateral alkyl chain were synthesized and found to exhibit the ferroelectric nematic phase. The presence of molecular chirality induced helical structures in both the N* and N-F* phases, but with opposite helix sense. The relaxation frequency of polar fluctuations was only weakly influenced by the helical structure.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Ewan Cruickshank et al.
Summary: This article reports the synthesis and characterization of two series of low molar mass liquid crystals in order to investigate the influence of a lateral alkyloxy chain on the formation and stability of ferroelectric nematic phase. The two series differ by the addition of a fluorine substituent. The members of both series exhibit different phase transitions depending on the length of the lateral chain, with a reduction in nematic-isotropic transition temperature and an increase in ferroelectric nematic-nematic or isotropic transition temperature observed as the chain length increases. These findings suggest that the lateral alkyloxy chain adopts specific conformations that affect the mesophase behavior.
Article
Chemistry, Multidisciplinary
Jinxing Li et al.
Summary: Researchers have proposed a principle for designing and controlling the phase behaviors of ferroelectric materials, and through experiments and analysis, they have discovered that the interplay between shape anisotropy and polarization field leads to diverse behaviors in polar liquid crystals.
Article
Chemistry, Physical
Richard J. Mandle
Summary: This article presents the latest research progress in the field of nematic liquid crystals, including the discovery of new nematic phases, the understanding of their molecular origins, the role of molecular structure, and future directions.
Article
Chemistry, Physical
Yaohao Song et al.
Summary: The emerging ferroelectric nematic liquid crystals have attracted broad interests for their unique material properties and the challenge of limited material choice. This work presents a design of novel ferroelectric nematic materials and confirms their characteristics through rigorous experiments.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Stevie Brown et al.
Summary: This study reports liquid-crystal materials with up to three nematic phases, each exhibiting different properties such as ferroelectric order, apolar order, and local antiferroelectric order. The modification of molecular structure through increasing lateral fluorine substituents leads to a direct isotropic-ferronematic phase transition in one of the materials.
Article
Chemistry, Multidisciplinary
Jinxing Li et al.
Summary: The emerging ferroelectric nematic (N-F) liquid crystal is a novel 3D-ordered liquid exhibiting macroscopic electric polarization. Through precision synthesis of aromatic rod-shaped mesogens, the mu value of the N-F materials can be increased beyond 30 Debye, and the ferroelectric packing of oligomer/polymer rods offers new insights in liquid crystal polymer materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Xiuhu Zhao et al.
Summary: A new state of matter called helielectric nematic has been discovered, which exhibits gigantic dielectric and nonlinear optical responses. This discovery opens up new possibilities for developing diverse polar liquid crystal devices.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Atsutaka Manabe et al.
Summary: The liquid crystal 1 exhibits ferroelectricity at room temperature, with a relative permittivity of over 20000 observed in the ferroelectric nematic phase. It enters the ferroelectric nematic phase directly from the isotropic phase upon cooling, without the formation of a conventional nematic phase.
Article
Multidisciplinary Sciences
Jinxing Li et al.
Summary: Researchers have developed superhigh-epsilon fluid materials with high dielectric permittivity, strong second harmonic generation, and macroscopic spontaneous polar ordering through rational molecular design and machine learning analyses. They confirmed that the polar structures are identical for all the synthesized materials and successfully extended this strategy to high-molecular weight systems, creating polar soft matters with spontaneous symmetry breaking.
Article
Chemistry, Multidisciplinary
Hiroya Nishikawa et al.
Summary: A novel chiral nematic phase Np* with a polar helical order has been realized, which is characterized by a continuously twisted polarization and ultrafast electro-optic switching performance. The properties of Np* differ from conventional cholesteric phases and have been confirmed through transmission spectroscopy and measurements. This unique Np*LC structure suggests new potential applications for electrically interchangeable photonic bandgaps.
ADVANCED MATERIALS
(2021)
Article
Physics, Fluids & Plasmas
N. Madhusudana
Summary: Nematic liquid crystals, a liquid medium with apolar orientational order, have been found to exhibit a ferroelectric nematic phase in compounds with certain molecular structures as temperature decreases. A simple model involving cylindrical rods with surface charge density waves is proposed to explain why certain compounds show the ferroelectric nematic phase. The weakly first-order nature of the transition from NLC to FN is suggested to arise from a coupling of the polar order and medium density.
Article
Multidisciplinary Sciences
Xi Chen et al.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Chemistry, Physical
Richard J. Mandle et al.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2017)
Article
Chemistry, Multidisciplinary
Hiroya Nishikawa et al.
ADVANCED MATERIALS
(2017)
Article
Chemistry, Multidisciplinary
Richard J. Mandle et al.
CHEMISTRY-A EUROPEAN JOURNAL
(2017)
Article
Chemistry, Multidisciplinary
T. Donaldson et al.
Article
Chemistry, Multidisciplinary
Guan-Yeow Yeap et al.
Article
Computer Science, Software Engineering
Marco Tarini et al.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2006)
