Liquid Crystals Reviews, Journal Year: 2024, Volume and Issue: 12(2), P. 149 - 194
Published: July 2, 2024
Language: Английский
Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 24, 2025
Ferroelectric nematic (NF) liquid crystals combine liquid-like fluidity and orientational order of conventional nematics with macroscopic electric polarization comparable in magnitude to solid-state ferroelectric materials. Here, we present a systematic study twenty-seven homologous materials various fluorination patterns, giving new insight into the molecular origins spontaneous polar ordering fluid nematics. Beyond our initial expectations, find highest stability NF phase be specific patterns rather than maximal fluorination, which might expected based on simple models. We delicate balance between apolar nematics, is entirely dictated by substitution fluorine atoms. Aided electronic structure calculations, show this have its radial distribution charge across surface, molecules possessing more oscillatory electrons their surfaces higher propensity form phases. This work provides set ground rules design principles that can inform synthesis future nematogens.
Language: Английский
Citations
7
Advanced Science, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 13, 2025
High birefringence nematic liquid crystals are particularly demanded for adaptive optics applications in the infrared spectrum because it enable a thinner cell gap achieving fast response time and improved diffraction efficiency. The emerging ferroelectric have attracted widespread interest soft matter due to their unique combination of ferroelectricity fluidity. However, birefringence, which is one most important optical parameters electro-optic devices, not large enough (<0.25) materials. Here, polar crystal molecule library containing more than 60 molecules with highly rigid fluorinated nature developed. introduction triple bonds constructs long π-electron conjugated mesogen skeleton, significantly improving phases. dispersion properties systematically studied, demonstrating strong dependence on chemical structures type Furthermore, through multi-component mixing, mixtures ultra-wide temperature range excellent stability at or near room obtained. They possess much higher existing high fluidic expected promote application technologies.
Language: Английский
Citations
3
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 30, 2024
Abstract The discovery of fluid states matter with spontaneous bulk polar order is appreciated as a major in the fields soft and liquid crystals. Typically, this manifests superimposed atop conventional phase structures thus far limited to orthogonal types. Here we report family materials which exhibit previously unseen state conclude smectic C phase, so term it SmC P . polarisation over two orders magnitude larger than that found ferroelectric chiral used some LCD devices. Fully atomistic molecular dynamics simulations faithfully spontaneously reproduce proposed structure associated properties; comparison experimental simulated X‐ray scattering patterns shows excellent agreement. disclosed here have significantly smaller dipole moments typical crystals such RM734 suggests role electrical polarity generating perhaps overstated, view supported by consideration other systems.
Language: Английский
Citations
6
Molecular Crystals and Liquid Crystals, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 15
Published: March 10, 2025
Language: Английский
Citations
0
Small, Journal Year: 2025, Volume and Issue: unknown
Published: April 7, 2025
Abstract Herein it is reported the first examples of reactive mesogenic materials (RMs) which exhibit fluid ferroelectric order based on recently discovered nematic (N F ) phase. These N RMs and they provide steps toward next generation liquid crystalline polymer networks termed. The chemical synthesis characterization properties these reported, demonstrating that have lowest longitudinal molecular dipole moments (µ) any material 7.39 D. It go to demonstrate a potential use case this new class through stabilization matrix exhibits phase, increasing phase range from 75 120 °C. herein are an exciting step forward in crystal research, achievable, allowing for future development networks, elastomers polymers.
Language: Английский
Citations
0
Physical review. E, Journal Year: 2025, Volume and Issue: 111(4)
Published: April 18, 2025
We report the effect of AC electric fields in range 0.1-300 kHz on antiferroelectric SmZ_{A} layers DIO bookshelf geometry. Significant results are (a) primary bifurcation into a quasistationary periodic instability with its voltage threshold U_{c} and wave vector q_{c} along initial director being, respectively, quadratic linear functions f over 10-150 kHz, an azimuthal distortion n which changes sign between adjacent stripes, (b) transition from modulated state to homogeneous at higher voltages, (c) third traveling further rise U region 10-40 kHz. interpret these findings as follows. The low is very similar that seen temperature apolar nematic phase electrohydrodynamic (EHD) possibly belonging dielectric inversion frequency. distortions result undulatory book-shelf intermediate structure absent coupling layer polarization P applied field E, giving scissoring type mutual reorientation layers. Finally, even medium goes field-induced ferroelectric nematic, following field, EHD being regime. polar symmetry leads general waves.
Language: Английский
Citations
0
Liquid Crystals Reviews, Journal Year: 2025, Volume and Issue: 13(1), P. 1 - 57
Published: Jan. 2, 2025
Language: Английский
Citations
0
Applied Research, Journal Year: 2025, Volume and Issue: 4(3)
Published: May 19, 2025
ABSTRACT Ferroelectric nematic (N F ) liquid crystals (LCs) have garnered substantial interest due to their unique polar ordering, phase transitions, and electro‐optic (E‐O) properties, with potential applications spanning from low‐power reflective displays advanced photonics microfluidics. This review explores the multifaceted nature of N LCs comprehensively analyzes behavior, alignment, surface interactions. Notable findings include (N)‐N transition's weak first‐order nature, treatments' role in inducing order, meron‐like structures resembling ferromagnetic domains. Furthermore, highlights tunability under electric fields, offering exciting possibilities for adaptive optics, sensors, actuators. Despite these advancements, challenges remain optimizing molecular controlling defects, expanding scalability LC technologies. By addressing key experimental theoretical studies, this aims present a deeper understanding crystals' E‐O responses, revolutionize future LC‐based
Language: Английский
Citations
0
Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 30, 2024
Abstract The discovery of fluid states matter with spontaneous bulk polar order is appreciated as a major in the fields soft and liquid crystals. Typically, this manifests superimposed atop conventional phase structures thus far limited to orthogonal types. Here we report family materials which exhibit previously unseen state conclude smectic C phase, so term it SmC P . polarisation over two orders magnitude larger than that found ferroelectric chiral used some LCD devices. Fully atomistic molecular dynamics simulations faithfully spontaneously reproduce proposed structure associated properties; comparison experimental simulated X‐ray scattering patterns shows excellent agreement. disclosed here have significantly smaller dipole moments typical crystals such RM734 suggests role electrical polarity generating perhaps overstated, view supported by consideration other systems.
Language: Английский
Citations
1
Liquid Crystals Reviews, Journal Year: 2024, Volume and Issue: 12(2), P. 149 - 194
Published: July 2, 2024
Language: Английский
Citations
0