Search or ask a question

Find liquid crystal ferroelectirc materia. which is original?

Phase transition

Spin transition

Best insight from top research papers

Ferroelectric liquid crystals (FLCs) are fascinating functional materials that have a remnant and electrically invertible polarization. Iron(II) metallomesogens incorporating alkyl chains of type [Fe(3Cn-bzimpy)2](BF4)2 (n = 8 (1), 10 (2), 12 (3), 14 (4), 16 (5) and 18 (6); bzimpy = 2,6-bis(benzimidazol-2′-yl)pyridine) that exhibit spin crossover (SCO) phenomena have been synthesized. Compounds 5 and 6 were each demonstrated to show SCO behaviour along with the occurrence of a phase transition between the crystalline (Cr) state and corresponding chiral smectic C (SmC*) state. The liquid crystalline compounds do not display ferroelectric behaviour in their Cr state but do exhibit ferroelectric hysteresis loops in their SmC* state. These findings will undoubtedly lead to new strategies for the design of new FLCs based on metal-centred spin transitions . A recently discovered ferroelectric columnar liquid crystal (LC) is reviewed. FCLC has an Ising polarization along the column axis, which is very stable once poling is performed and convertible by applying an opposite electric field. FCLCs are more suitable for applications such as piezoelectric devices and ultrahigh-density memory devices . The liquid crystal DOBAMBC showing the ferroelectric smectic C phase was reported by Meyer et al. in 1975 .

Answers from top 4 papers

PDF

Open Access

More filters

Papers (4)	Insight
Journal Article•DOI Liquid crystal for paintable ferroelectrics Fumito Araoka, Daigo Miyajima, Takuzo Aida, Morio Isoda, Hideo Takezoe, Masahito Oh-e - Show less +5 more 05 Aug 2014-Spie Newsroom 2 Citations	The paper discusses a new type of ferroelectric liquid crystalline phase called ferroelectric columnar liquid crystal (FCLC), which is an original organic molecular ferroelectric system.
Open access•Journal Article•DOI Ferroelectric metallomesogens composed of achiral spin crossover molecules. Ryohei Akiyoshi, Yuma Hirota, Daisuke Kosumi, Mayu Tsutsumi, Masaaki Nakamura, Leonard F. Lindoy, Shinya Hayami - Show less +6 more 05 Jun 2019-Chemical Science 28 Citations	The paper discusses the synthesis and properties of iron(II) metallomesogens that exhibit ferroelectric behavior. These compounds are original in terms of their ability to induce ferroelectricity through spin transition.
Journal Article•DOI Columnar liquid crystal as a unique ferroelectric liquid crystal Fumito Araoka, Hideo Takezoe - Show less +1 more 01 Jan 2014-Japanese Journal of Applied Physics 11 Citations	The paper discusses a recently discovered ferroelectric columnar liquid crystal (FCLC) which is described as the first genuine ferroelectric liquid crystal.
Journal Article•DOI Ferroelectric liquid crystals: The 2004 Benjamin Franklin Medal in Physics presented to Robert B. Meyer of Brandeis University Peter J. Collings 01 Sep 2005-Journal of The Franklin Institute-engineering and Applied Mathematics 9 Citations	The paper discusses the discovery of ferroelectricity in liquid crystals by Robert B. Meyer. He predicted and verified the ferroelectricity in a tilted, layered liquid crystal phase of chiral molecules.

My columns

Related Questions

What is a LiquidCrystal library for arduino lcd display?4 answersThe LiquidCrystal library is a library for Arduino that allows the control of LCD (liquid crystal display) modules. It is commonly used in various Arduino projects, including those involving water level control. The library provides functions to display text and symbols on LCDs, such as the popular Hitachi HD44780 driver chip. The library can be used to display information like the level of water in a tank, as well as other data or messages. Additionally, the library can enhance the display quality of LCD devices by improving brightness and chromatic purity. The use of the LiquidCrystal library in Arduino projects, such as automating libraries, can be cost-effective and beneficial for small-scale libraries that cannot afford expensive automated software.

How does alloying change ferroelectric properties?5 answersAlloying can have significant effects on the ferroelectric properties of materials. The addition of alloying elements can change the lattice constants and unit cell volume of the material, leading to alterations in its structural, magnetic, and electrical/thermal transport properties. The introduction of magnetic or non-magnetic elements through alloying can induce ferromagnetism in the material, potentially due to a reconstruction of the Fermi surface caused by chemical doping. Alloying can also affect the electrical transport behavior, with the resistivity and the residual resistivity ratio being influenced by the level of alloying concentration. Additionally, alloying can impact the thermal conductivity of the material, with solid-solution scattering and enhanced phonon scattering being the dominant factors. Therefore, alloying can alter the structural, magnetic, electrical, and thermal properties of ferroelectric materials, ultimately affecting their overall ferroelectric behavior.

Is WTe2 ferroelectric?3 answersWTe2 is a ferroelectric material that exhibits spontaneous out-of-plane electric polarization and ferroelectric switching. The polar structure of WTe2 is considered to be important in these observations. The ferroelectric polarization of WTe2 can be enhanced by the application of an ultrashort laser pulse, leading to a significant increase in electric polarization within a short time period. Additionally, the moiré superlattice effects in WTe2 can be controlled by the ferroelectric effect, allowing for the switching of correlated and moiré band insulating states. These findings highlight the potential of WTe2 as a functional material with tunable electronic properties and suggest that surface oxidation and resulting band bending should be taken into account in WTe2-related devices.

Materials that exhibit ferroelectricity?5 answersFerroelectric materials that exhibit ferroelectricity include PbZrxTi1-xO3 (PZT) ceramics, (Hf,Zr)O2 and (Al,Sc)N, and BaTiO3-based, K1/2Na1/2NbO3-based, and PbMg1/3Nb2/3TiO3-PbTiO3 ceramics. The low-dimensional perovskites also show potential for ferroelectricity. Additionally, a ScxAl1−xN wurtzite phase exhibits ferroelectric properties.

How do liquid crystals interact with DNA?4 answersLiquid crystals (LCs) can interact with DNA through electrostatic interactions and DNA binding to surfactant vesicles. The formation of DNA-involved LCs has been observed using polarizing optical microscopy (POM). The properties of DNA-based LCs can be influenced by the chain lengths of surfactants and DNA, as well as the position of functional groups on surfactants. The amount of DNA can also affect the formation and properties of DNA-based LCs, with shorter DNA strands enhancing thermal stability. DNA sequence design can be used to separate nucleation and growth in crystallization processes, leading to improved crystal uniformity and size control. Positively charged catanionic surfactant vesicles can bond with DNA to form long-range ordered lamellar crystals. DNA doping can induce twist deformations in LC alignment, with the specific DNA base influencing the twisted structure.

How are liquid crystals manufactured?8 answers

See what other people are reading

How do meso-sized holes increase hydrogel swelling?

Meso-sized holes in hydrogels can significantly increase swelling by inducing a macroporous structure that enhances water uptake and swelling rates. The presence of these holes allows for improved diffusion of water molecules into the hydrogel network, overcoming diffusional limitations of bulk hydrogels. Additionally, the introduction of holes into actuating bilayers can lead to complex and rapid folding behavior due to inhomogeneous swelling within the thermoresponsive layer, resulting in fast shape changes and intricate folding patterns. Furthermore, the phase transition in chemically cross-linked gels starts at the free surface of the hole, showcasing a unique phenomenon where the growth of the new phase is constrained around the hole, influencing the overall swelling behavior of the hydrogel.Why Cu(OH)2 changed into black?

Cu(OH)2 changes into black copper(II) oxide due to a structural transformation induced by various factors. In the presence of OH− anions, Cu(OH)2 can undergo a transition to Cu2(OH)3NO3 nanosheets or CuAl2O4-like species, leading to the formation of black copper(II) oxide. This transformation is crucial in the reversible and irreversible deactivation of Cu-SAPO-34 SCR catalysts, where Cu(II) ions convert to Cu(OH)2 and then to CuAl2O4-like species, causing deactivation. Additionally, the reversible phase transformation of [Cu(hfac)2LEt]-I crystals involves a color change from blue to dark brown, indicating a structural transition from paramagnetic to diamagnetic states, which could be related to the black color of copper(II) oxide. Therefore, the change of Cu(OH)2 to black copper(II) oxide is a result of complex structural modifications induced by different chemical environments and interactions.How is symmetry in sponge?

Symmetry in sponges is a fascinating aspect that showcases both radial and tetraradial patterns. Sponges exhibit a unique form of symmetry, with some displaying radial symmetry of indeterminate high order or none, combined with polarization along the axis. Studies on sponge spicules, single crystals of Mg-bearing calcite, reveal a reduction in symmetry at the level of crystal domain shapes, indicating a deviation from the hexagonal symmetry of calcite. Additionally, analyses of surfactant systems forming sponge phases highlight the presence of an "inside/outside" symmetry associated with bilayer structures, influencing the osmotic compressibility and leading to fluctuation-induced corrections in elasticity parameters. This intricate interplay of symmetry in sponges reflects a complex control over crystal growth and structural organization.Why hysteresis increases from 4.5 to 11.3 while peak and transformation temperatures decrease in shape memory alloy Ni-Co-Mn-Sn?

The increase in hysteresis from 4.5 to 11.3 in the Ni-Co-Mn-Sn shape memory alloy is attributed to the increase in the proportion of the austenite phase and the decrease in the martensite phase with the addition of Co and Ti, leading to a dominant B2 austenite phase for x = 3. Additionally, the decrease in hysteresis width of martensitic transformations (MTs) in shape memory alloys (SMAs) is a challenging problem, with defects playing a minor role compared to thermodynamic and crystallographic factors. Furthermore, the thermal scanning rate in differential scanning calorimetry (DSC) affects the observation of hysteresis width and transformation temperatures in Ni-Ti-based SMAs, showcasing the interplay between material parameters and scanning velocity.How deep learning models have been applied in the Classification of crystal structures?

Deep learning models have been extensively utilized in the classification of crystal structures. Various studies have demonstrated the effectiveness of deep convolutional neural networks (CNNs) in this domain. These models have been employed for tasks such as classifying crystal systems and space groups based on diffraction patterns, predicting crystal structure classes using Wyckoff sites, and identifying phase transitions in liquid crystals. Additionally, the application of deep transfer learning models has shown promising results in crystal structure classification, achieving high accuracy rates and enhancing prediction model generalization. Furthermore, the introduction of models equivariant with respect to crystalline symmetry groups has led to competitive results in property prediction tasks within materials science.How does the X-ray diffraction technique reveal the dynamic structure of electrons in metals?

The X-ray diffraction technique provides insights into the dynamic structure of electrons in metals by enabling the direct imaging of atomic dynamics on their natural time and length scales. This method utilizes ultrashort X-ray pulses to capture rapid structural changes in materials, such as phase transitions driven by ultrashort excitation, revealing nanoscale structural rearrangements with high spatial and temporal resolutions. Additionally, X-ray free-electron lasers (XFELs) deliver intense coherent X-ray pulses that can modify the electronic properties of samples on a femtosecond time scale, allowing for the exploration of interactions between intense X-ray pulses and matter, leading to the observation of coherent dynamic electronic distortions in crystalline materials. Overall, these advanced X-ray techniques offer a powerful means to study and understand the dynamic behavior of electrons in metals at the atomic level.What is the mechanism of calcium cabonate precipitation studied through neutron scattering?

The mechanism of calcium carbonate precipitation has been studied through neutron scattering techniques, revealing crucial insights. Neutron powder diffraction studies have shown that the phase transition in calcite towards orientational order-disorder resembles a rotational analogue of Lindemann melting, triggered by critical librational amplitudes of carbonate ions. Small Angle Neutron Scattering (SANS) has been utilized to investigate precipitation phenomena, allowing for the determination of size, shape, density, and chemical composition of precipitates, along with kinetic process exploration under various growth conditions. Additionally, neutron thermodiffraction analysis has provided a comprehensive understanding of the decomposition, reaction process, crystalline phase evolution, and formation kinetics of CaZrO3 in the ZrO2-CaO-MgO system. These studies collectively contribute to elucidating the intricate mechanism of calcium carbonate precipitation through neutron scattering methodologies.What is the multiplicity factor in nuclear physiscs?

The multiplicity factor in nuclear physics refers to various observable quantities that provide insights into the behavior of nuclear matter during collisions. Studies have shown that multiplicity-momentum correlations can indicate the level of equilibration in relativistic nuclear collisions, with non-zero values suggesting a lack of local thermal equilibrium. Additionally, the ratio of cumulant and factorial moments of multiplicity distributions, influenced by nuclear factors, has been analyzed in perturbative gluodynamics solutions. Observables like the total multiplicity of fragmenting systems in heavy nucleus collisions can indicate first-order liquid-gas phase transitions in nuclear matter, with implications for thermodynamic properties. Furthermore, the behavior of average multiplicities and angular distributions of emitted particles in hadron-nuclear interactions changes with collision centrality, highlighting the importance of multiplicity distributions in understanding interaction dynamics.About piezoelectric polymers specially aobut PVDF-TrFE ?

Piezoelectric polymers, particularly polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE), are gaining attention for their applications in energy harvesting and sensors due to their flexibility and cost-effectiveness. PVDF-TrFE composites with one-dimensional piezoelectric nanowires have shown enhanced properties, with an optimal composition containing 15 wt % nanowires exhibiting a high energy harvesting figure of merit. Additionally, PVDF-TrFE films have been characterized up to the gigahertz range, revealing nonuniform poling and distinct resonance modes. Furthermore, PVDF-TrFE substrates combined with FeCoSiB thin films have demonstrated significant magnetoelectric voltage coefficients, making them promising for flexible magnetoelectric devices. These advancements highlight the potential of PVDF-TrFE in developing efficient and versatile piezoelectric materials for various applications.Is supersaturation involved in classical and nonclassical nucleation theories?

Supersaturation plays a crucial role in both classical and nonclassical nucleation theories. In classical nucleation theory (CNT), supersaturation drives the formation of small clusters that reach a critical size to become thermodynamically stable for further growth. On the other hand, recent studies propose nonclassical features in nucleation, such as the two-step nucleation mechanism, where a metastable intermediate phase (MIP) exists alongside the supersaturated solution and final crystals. The PNC pathway challenges the traditional CNT view by emphasizing the dynamics of pre-nucleation clusters over critical nuclei, highlighting the importance of supersaturation dynamics in nucleation processes. Understanding supersaturation dynamics is essential for predicting crystal growth profiles and modulating crystal shapes in various systems, including colloidal nanocrystals.What is the scientific rationale behind incubating total cholesterol samples at 37°C?

The scientific rationale behind incubating total cholesterol samples at 37°C lies in the structural transition and configurational changes in the aliphatic chain of the cholesterol molecule. Additionally, incubating samples at this temperature can induce capacitation-like changes in sperm, affecting their quality and viability. Furthermore, maintaining a stable temperature during storage is crucial for preserving the integrity of blood specimens, as fluctuations can impact the stability of the specimen and lead to changes in cholesterol levels. Therefore, incubating total cholesterol samples at 37°C ensures that any structural transitions or changes in the cholesterol molecule are accurately reflected in the analysis, contributing to the reliability of cholesterol level measurements.